公開中のアプリ

[Swift/Xcode]初心者必見!iOSアプリ作成から公開まで徹底解説!#14「アクティブボタン解除編」

今回は青色になったボタンをもう一度押すとグレイに戻ってしまうところを修正したいと思います!

動作環境は下記の通りです!
Xcode Version 12.5 Swift version 5.4

完成動画はこちらです!

今回の修正をイメージする

まずタップしたボタンがアクティブなボタンかどうか判定する必要があります。

押されたボタンのタグ番号がRealmに保存されているかどうかで判定できそうです!

そして条件分岐で、保存されていれば「解除しますか?」のアラート出したいと思います。
保存されていなければ今まで通り青に変わりかけた色をグレイに戻してあげます。

アラートを出してOKボタンを押したらRealmからデータを消すところまで実装したいと思います!

Realmのデータを検索して条件分岐する

Realmのデータを検索する方法はググればすぐ出てくると思いますが、こちらの記事は参考になるかと思います。

今回修正する箇所はMainViewController.swiftのlongPressed()です!
コードは下記です〜!

//長押し機能
@objc func longPressed(_ sender: UILongPressGestureRecognizer) {

    if sender.state == .began {
        print("ボタン押した")
        btnTag = sender.view!.tag
        UIView.animate(withDuration: 2) {
            self.buttonArray[sender.view!.tag - 1].backgroundColor = UIColor.blue
        }
        startTimer()

    } else if sender.state == .ended {
        print("ボタン離した")
        if longTapOK == false {
            //realmの呼び出し
            let realm = try! Realm()
            //if文で条件分岐
            if realm.objects(Btn365.self).filter("tagNum == \(sender.view!.tag)").first != nil {
                print("アラートを出す")
            } else {
                //色をグレイに戻す
                UIView.animate(withDuration: 0.1) {
                    self.buttonArray[sender.view!.tag - 1].backgroundColor = UIColor.lightGray
                }
            }
            //タイマーストップ
            timer.invalidate()
        } else {
            print("ロングタップ成功")
            longTapOK = false
        }
    }
}

今回修正した部分は16行目からですね!
とりあえずRealmを呼び出してます!

データの検索部分が18行目です!

“tagNum == \(sender.view!.tag)”
この部分で保存されてるデータのタグ番号と押したボタンの番号を比較しています。

データがnilじゃなかったら(つまり検索にヒットしたら)アラートを出す。
データがなかったら色をグレイに戻しています。

こういう検索して条件分岐するって言うのは以前作ったアプリでもすごく使ったので覚えておくと良いと思います!!

アラートを出す!

アラートって普通UIAlertControllerを使うと思うんですけど、カスタマイズしたくて調べても全然良い記事がなくて、カスタマイズ難しくね?ってなったのでUIAlertControllerは使っていません。

んで何を使っているかと言うと、DOAlertControllerです!
こちらを作ってくれた方、本当に感謝してます。ありがとうございます。
詳しい使い方はこちらからどうぞ!

DOAlertControllerの導入方法がいまいちわからない人はこの記事の最後に載せますね!

では下記のコードをlongPressed()のアラートを出す部分に追加しましょう!

print("アラートを出す")
//アラートのタイトルやメッセージの設定
let alertController = DOAlertController(title: "解除しますか?", message: "", preferredStyle: .alert)
//キャンセルアクションの設定
let cancelAction = DOAlertAction(title: "Cancel", style: .cancel, handler: nil)
//OKアクションの設定
let okAction = DOAlertAction(title: "OK", style: .default) { action in
    print("OKボタンが押された")
}
//キャンセルとOKのアクションを追加
alertController.addAction(cancelAction)
alertController.addAction(okAction)
//アラートを表示
present(alertController, animated: true, completion: nil)

色とかデザインは今度実装しますので今回はとりあえず機能だけつけます。

上記のコードに書いてるコメントの通りなので説明する事もないですね(^^;

ではビルドして一度動きを試してみて下さい!

青色ボタンを押した時にアラートが表示されて
Cancelを押すと戻って、OKを押すと「OKボタンが押された」と出力されるはずです!

Realmのデータの消去方法

ではアラートが出てOKボタンを押した時の処理を実装したいと思います!

まずはRealmDB.swiftファイルに下記コードを追加します。

//データの消去
static func delete(tag: Int) {
    if let del = Btn365.realm.objects(Btn365.self).filter("tagNum == \(tag)").first {
        try! Btn365.realm.write {
            Btn365.realm.delete(del)
        }
    }
}

処理の流れとしては、delete(tag: Int)メソッドの引数に押したボタンのタグ番号を設定しています。

そして、先ほどと同じようにRealmのデータを検索してヒットしたデータを削除してます!

あとはdelete(tag: Int)メソッドをアラートのOKボタンが押された時に実行すればOKです!

コードは下記です!

//OKアクションの設定
let okAction = DOAlertAction(title: "OK", style: .default) { action in
    print("OKボタンが押された")
    
    Btn365.delete(tag: sender.view!.tag)
    self.buttonArray[sender.view!.tag - 1].backgroundColor = UIColor.lightGray
}

5行目でRealmからデータを削除してます!
6行目で色をグレイに戻してます!

ビルドして実際に操作してみてください!
データが削除されたかどうかは右上の参照ボタンで確認できます!

まとめ

だいぶ形になってきましたね!!

そろそろデザイン考えても良さそうですね!

その前にちょっとコードが長くなってるので少しまとめてみようと思います!

最後まで読んでくれた人ありがとうございます!

コメントくれると嬉しいです!お願いします〜!

ここまでのコード全部

MainViewController.swift

import UIKit
import AudioToolbox
import RealmSwift

class MainViewController: UIViewController {

//スクロールビュー
let scrollView = UIScrollView()
//ボタンを表示用のビュー
let inView: UIView = UIView()
//スタックビュー縦用
var stackV: UIStackView = UIStackView()
//ボタンの配列
var buttonArray: [UIButton] = []
//スタックビュー横を格納する為の配列
var stkArray: [UIStackView] = []
//貯金額合計
var totalSavings = 0
//貯金開始?日目
var whatDay = 0
// DB参照ボタン
var referenceBtn: UIBarButtonItem!
//DBリセットボタン
var resetBtn: UIBarButtonItem!

//オレンジ色のビュー
let topView: UIView = UIView()
//白色のビュー
let topViewInner: UIView = UIView()
//合計日数のラベル
let dayLabel: UILabel = UILabel()
//貯金額のラベル
let moneyLabel: UILabel = UILabel()


override func viewDidLoad() {
super.viewDidLoad()
    
//ビューの生成
viewCreate()
//ラベルの生成
labelCreate()
//ボタンの生成
btnCreate()
//スタックビューの生成
stackViewCreate()

//ナビゲーションコントローラーまわり
//タイトル
self.title = "365貯金"
//背景色
self.navigationController?.navigationBar.barTintColor = UIColor.orange
//セーフエリアとの境目の線を消す
self.navigationController?.navigationBar.shadowImage = UIImage()
//上部が黒くなるのを回避
view.backgroundColor = UIColor.systemBackground

//Realmテスト用ボタン右
referenceBtn = UIBarButtonItem(title: "参照", style: .done, target: self, action: #selector(self.referenceBtnTapped))
self.navigationItem.rightBarButtonItem = referenceBtn
//Realmテスト用ボタン左
resetBtn = UIBarButtonItem(title: "リセット", style: .done, target: self, action: #selector(self.resetBtnTapped))
self.navigationItem.leftBarButtonItem = resetBtn

//realmの呼び出し
let realm = try! Realm()
//保存されたデータが定数Btn365に入る
let Btn365 = realm.objects(Btn365.self)
//定数Btn365をfor文で回し、ボタンの色を変更しつつ、貯金額を足しつつ、日数も足してる。
for i in 0..<Btn365.count {
    //ボタンの色を変更
    buttonArray[Btn365[i].tagNum - 1].backgroundColor = UIColor.blue
    //貯金額を足してる
    totalSavings += Btn365[i].tagNum
    //日数はアクティブなボタンの数と同じ
    whatDay += 1
}
//貯金額ラベルを更新
moneyLabel.text = "合計貯金額\(totalSavings)円"
//合計日数ラベルを更新
dayLabel.text = "\(whatDay)日目"
}

//DB参照
@objc func referenceBtnTapped() {
    let realm = try! Realm()
    let Btn365 = realm.objects(Btn365.self)
    print(Btn365)
    }
//DBリセット
@objc func resetBtnTapped() {
    let realm = try! Realm()
    try! realm.write {
      realm.deleteAll()
    }
}
    
//ビュー生成
func viewCreate() {
    //オレンジ色のビューの表示
    view.addSubview(topView)
    //白色のビューの表示
    topView.addSubview(topViewInner)
    //スクロールビューの表示
    view.addSubview(scrollView)
    //ボタン表示用ビューの表示
    scrollView.addSubview(inView)

    //スクロールビューの設定
    //AutosizingをAutoLayoutに変換しないようにしている(おまじない)
    scrollView.translatesAutoresizingMaskIntoConstraints = false
    //スクロールビューの上側の位置を設定
    scrollView.topAnchor.constraint(equalTo: topView.bottomAnchor, constant: 20.0).isActive = true
    //スクロールビューの下側の位置を設定
    scrollView.bottomAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.bottomAnchor, constant: -20.0).isActive = true
    //Y軸
    scrollView.centerXAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.centerXAnchor).isActive = true
    //横幅
    scrollView.widthAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.widthAnchor, multiplier: 0.9).isActive = true


    //ボタン表示用ビューの設定
    //AutosizingをAutoLayoutに変換しないようにしている(おまじない)
    inView.translatesAutoresizingMaskIntoConstraints = false
    //横幅
    inView.widthAnchor.constraint(equalTo: scrollView.widthAnchor, multiplier: 1.0).isActive = true
    //この4つの制約をつけて初めてスクロールするっぽい
    inView.leftAnchor.constraint(equalTo: scrollView.leftAnchor, constant: 0).isActive = true
    inView.rightAnchor.constraint(equalTo: scrollView.rightAnchor, constant: 0.0).isActive = true
    inView.topAnchor.constraint(equalTo: scrollView.topAnchor, constant: 0.0).isActive = true
    inView.bottomAnchor.constraint(equalTo: scrollView.bottomAnchor, constant: 0.0).isActive = true


    //オレンジのビューのレイアウト
    //AutosizingをAutoLayoutに変換しないようにしている(おまじない)
    topView.translatesAutoresizingMaskIntoConstraints = false
    //X軸
    topView.centerXAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.centerXAnchor).isActive = true
    //Y軸
    topView.topAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.topAnchor).isActive = true
    //横幅
    topView.widthAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.widthAnchor, multiplier: 1).isActive = true
    //縦幅
    topView.heightAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.heightAnchor, multiplier: 0.125).isActive = true
    //背景色
    topView.backgroundColor = UIColor.orange

    //白色のビューのレイアウト
    //(おまじない)
    topViewInner.translatesAutoresizingMaskIntoConstraints = false
    //X軸
    topViewInner.centerXAnchor.constraint(equalTo: topView.centerXAnchor).isActive = true
    //Y軸
    topViewInner.centerYAnchor.constraint(equalTo: topView.centerYAnchor).isActive = true
    //横幅
    topViewInner.widthAnchor.constraint(equalTo: topView.widthAnchor, multiplier: 0.9).isActive = true
    //縦幅
    topViewInner.heightAnchor.constraint(equalTo: topView.heightAnchor, multiplier: 0.75).isActive = true
    //背景色
    topViewInner.backgroundColor = UIColor.white
    }

//ラベル生成
func labelCreate() {
    //合計日数のラベルを表示
    topViewInner.addSubview(dayLabel)
    //貯金額のラベルを表示
    topViewInner.addSubview(moneyLabel)

    //合計日数のラベルのレイアウト
    //(おまじない)
    dayLabel.translatesAutoresizingMaskIntoConstraints = false
    //X軸
    dayLabel.leftAnchor.constraint(equalTo: topViewInner.leftAnchor, constant: 20.0).isActive = true
    //Y軸
    dayLabel.centerYAnchor.constraint(equalTo: topViewInner.centerYAnchor).isActive = true
    //ラベルのテキスト
    dayLabel.text = "\(whatDay)日目"

    //貯金額のラベルのレイアウト
    //(おまじない)
    moneyLabel.translatesAutoresizingMaskIntoConstraints = false
    //X軸
    moneyLabel.rightAnchor.constraint(equalTo: topViewInner.rightAnchor, constant: -20.0).isActive = true
    //Y軸
    moneyLabel.centerYAnchor.constraint(equalTo: topViewInner.centerYAnchor).isActive = true
    //ラベルのテキスト
    moneyLabel.text = "合計貯金額 \(totalSavings)円"
}
    
//スタックビュー生成
func stackViewCreate() {
    //スタックビュー縦の設定
    //スタックビューの方向を縦に
    stackV.axis = .vertical
    //中のオブジェクトをどこに揃えて配置するか
    stackV.alignment = .fill
    //どう配置するか
    stackV.distribution = .fill
    //オブジェクト同士のスペース
    stackV.spacing = 4
    //おまじない
    stackV.translatesAutoresizingMaskIntoConstraints = false
    //stackVの背景色
    stackV.backgroundColor = UIColor.white
    //stackVを表示
    inView.addSubview(stackV)
    //X軸
    stackV.centerXAnchor.constraint(equalTo: inView.centerXAnchor).isActive = true
    //トップ位置
    stackV.topAnchor.constraint(equalTo: stackV.topAnchor, constant: 0.0).isActive = true
    //横幅
    stackV.widthAnchor.constraint(equalTo: inView.widthAnchor, multiplier: 1.0).isActive = true
    //縦幅
    stackV.heightAnchor.constraint(equalTo: inView.heightAnchor, multiplier: 1.0).isActive = true

    //スタックビュー横を自動生成
    for i in 0 ..< 73 {
        //StackHの生成
        let stackH:UIStackView = UIStackView()
        //スタックビューの方向を横に
        stackH.axis = .horizontal
        //オブジェクト同士のスペース
        stackH.spacing = 4
        //中のオブジェクトをどこに揃えて配置するか
        stackH.alignment = .fill
        //どう配置するか
        stackH.distribution = .fillEqually
        //スタックビュー配列に追加
        stkArray.append(stackH)
        //stackVの中にstackHを格納
        stackV.addArrangedSubview(stkArray[i])
    }

    //ボタンの配置
    //for文のカウンター変数
    var count = 0
    //for文で365個のボタンをどのstackHに入れるか決めている
    for i in 1 ..< 366 {
        //カウントの数に応じてどのstackHに入るか決定する。
        stkArray[count].addArrangedSubview(buttonArray[i - 1] as UIView)
        //ボタンは5列なので5の倍数でcountを一つ増やす。
        if i % 5 == 0 {
            count += 1
        }
    }
}

//ボタン生成
func btnCreate() {
    //ボタンの生成と設定
    //ボタンにtagを付ける為の変数
    var tagNumber = 1
    //for文でボタンを生成
    for _ in 0...364 {
        //ボタン生成
        let button: UIButton = UIButton(type: .custom)
        //タイトルの色
        button.setTitleColor(UIColor.black, for: UIControl.State())
        //タイトルは数字なのでtagナンバーを指定
        button.setTitle(String(tagNumber), for: UIControl.State())
        //tag設定
        button.tag = tagNumber
        //背景色
        button.backgroundColor = UIColor.lightGray
        //ボーダーの横幅
        button.layer.borderWidth = 3
        //ボターの色
        button.layer.borderColor = UIColor.black.cgColor
        //AutosizingをAutoLayoutに変換しないようにしている(おまじない)
        button.translatesAutoresizingMaskIntoConstraints = false
        //ボタンの横幅が可変なのでボタンの高さは横幅と同じ長さを指定する事で正方形にしてる。
        button.heightAnchor.constraint(equalTo: button.widthAnchor, multiplier: 1.0).isActive = true
        //変数tagNumberに1追加
        tagNumber += 1
        //ボタン長押し
        let longPressGesture = UILongPressGestureRecognizer(target: self, action: #selector(longPressed(_:))
        )
        //長押しを認識する時間の設定
        longPressGesture.minimumPressDuration = 0.01
        //ボタンに長押し機能を付ける
        button.addGestureRecognizer(longPressGesture)
        //ボタンの配列に追加
        buttonArray.append(button)
    }
}

// MARK: - ここからアニメーション関係
//タイマー初期化
var timer: Timer!
//2秒長押ししたかどうか判定する変数
var longTapOK = false
//ボタンのタグを関数の外に出す為の変数
var btnTag = 0

//長押し機能
@objc func longPressed(_ sender: UILongPressGestureRecognizer) {

    if sender.state == .began {
        print("ボタン押した")
        btnTag = sender.view!.tag
        UIView.animate(withDuration: 2) {
            self.buttonArray[sender.view!.tag - 1].backgroundColor = UIColor.blue
        }
        startTimer()

    } else if sender.state == .ended {
        print("ボタン離した")
        if longTapOK == false {
            //realmの呼び出し
            let realm = try! Realm()
            
            //if文で条件分岐
            if realm.objects(Btn365.self).filter("tagNum == \(sender.view!.tag)").first != nil {
                print("アラートを出す")
                //アラートのタイトルやメッセージの設定
                let alertController = DOAlertController(title: "解除しますか?", message: "", preferredStyle: .alert)
                //キャンセルアクションの設定
                let cancelAction = DOAlertAction(title: "Cancel", style: .cancel, handler: nil)
                //OKアクションの設定
                let okAction = DOAlertAction(title: "OK", style: .default) { action in
                    print("OKボタンが押された")
                    
                    Btn365.delete(tag: sender.view!.tag)
                    self.buttonArray[sender.view!.tag - 1].backgroundColor = UIColor.lightGray
                }
                //キャンセルとOKのアクションを追加
                alertController.addAction(cancelAction)
                alertController.addAction(okAction)
                //アラートを表示
                present(alertController, animated: true, completion: nil)
            } else {
                //色をグレイに戻す
                UIView.animate(withDuration: 0.1) {
                    self.buttonArray[sender.view!.tag - 1].backgroundColor = UIColor.lightGray
                }
            }
            //タイマーストップ
            timer.invalidate()
        } else {
            print("ロングタップ成功")
            longTapOK = false
        }
    }
}

//タイマーの設定
func startTimer() {
    timer = Timer.scheduledTimer(
        timeInterval: 2, //タイマーの間隔を設定
        target: self,
        selector: #selector(self.timerCounter), //メソッドの設定
        userInfo: nil,
        repeats: false) //リピートするかどうか
}
    
//タイマーで実行される処理
@objc func timerCounter() {
    //ロングタップ成功
    longTapOK = true
    //ぽよよんアニメーションの実行
    animateView(topViewInner)
    //バイブさせる
    AudioServicesPlaySystemSound(1102)
    //ラベルの更新
    updateLabel()
    //RealmDBへ登録
    let a = Btn365.create()
    a.tagNum = btnTag
    a.save()
}
    
//ラベルの値を更新する(長押し認識してから2秒後に実行される)
func updateLabel() {
    //貯金額を更新
    totalSavings += btnTag
    //合計日数を更新
    whatDay += 1
    //貯金額ラベルを更新
    moneyLabel.text = "合計貯金額\(totalSavings)円"
    //合計日数ラベルを更新
    dayLabel.text = "\(whatDay)日目"
}
    
//ぽよよんアニメーション
func animateView(_ viewToAnimate:UIView) {
    UIView.animate(withDuration: 0.2, delay: 0, options: .curveEaseIn, animations: {
        viewToAnimate.transform = CGAffineTransform(scaleX: 1.08, y: 1.08)
    }) { (_) in
        UIView.animate(withDuration: 0.4, delay: 0, usingSpringWithDamping: 0.3, initialSpringVelocity: 10, options: .curveEaseOut, animations: {
            viewToAnimate.transform = .identity

        }, completion: nil)
    }
}
    
}

RealmDB.swift

import Foundation
import RealmSwift

class Btn365: Object {
//おまじない
static let realm = try! Realm()
//必要なデータの変数を作る。
@objc dynamic var tagNum: Int = 0

//データの登録
static func create() -> Btn365 {
        let addDate = Btn365()
        return addDate
}
//データの保存
func save() {
    try! Btn365.realm.write {
        Btn365.realm.add(self)
    }
}
//データの消去
static func delete(tag: Int) {
    if let del = Btn365.realm.objects(Btn365.self).filter("tagNum == \(tag)").first {
        try! Btn365.realm.write {
            Btn365.realm.delete(del)
        }
    }
}
}

DOAlertController.swift

これがアラート部分のコードです!
新しいswiftファイルを作って下記をコピペするだけで使えるようになります!

import Foundation
import UIKit

let DOAlertActionEnabledDidChangeNotification = "DOAlertActionEnabledDidChangeNotification"

public enum DOAlertActionStyle : Int {
    case `default`
    case cancel
    case destructive
}

public enum DOAlertControllerStyle : Int {
    case actionSheet
    case alert
}

// MARK: DOAlertAction Class

open class DOAlertAction : NSObject, NSCopying {
    open var title: String
    open var style: DOAlertActionStyle
    var handler: ((DOAlertAction?) -> Void)!
    open var enabled: Bool {
        didSet {
            if (oldValue != enabled) {
                NotificationCenter.default.post(name: Notification.Name(rawValue: DOAlertActionEnabledDidChangeNotification), object: nil)
            }
        }
    }
    
    required public init(title: String, style: DOAlertActionStyle, handler: ((DOAlertAction?) -> Void)!) {
        self.title = title
        self.style = style
        self.handler = handler
        self.enabled = true
    }
    
    open func copy(with zone: NSZone?) -> Any {
        let copy = type(of: self).init(title: title, style: style, handler: handler)
        copy.enabled = self.enabled
        return copy
    }
}

// MARK: DOAlertAnimation Class

open class DOAlertAnimation : NSObject, UIViewControllerAnimatedTransitioning {
    
    let isPresenting: Bool
    
    init(isPresenting: Bool) {
        self.isPresenting = isPresenting
    }
    
    open func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
        if (isPresenting) {
            return 0.45
        } else {
            return 0.25
        }
    }
    
    open func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
        if (isPresenting) {
            self.presentAnimateTransition(transitionContext)
        } else {
            self.dismissAnimateTransition(transitionContext)
        }
    }
    
    func presentAnimateTransition(_ transitionContext: UIViewControllerContextTransitioning) {
        
        let alertController = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.to) as! DOAlertController
        let containerView = transitionContext.containerView
        
        alertController.overlayView.alpha = 0.0
        if (alertController.isAlert()) {
            alertController.alertView.alpha = 0.0
            alertController.alertView.center = alertController.view.center
            alertController.alertView.transform = CGAffineTransform(scaleX: 0.5, y: 0.5)
        } else {
            alertController.alertView.transform = CGAffineTransform(translationX: 0, y: alertController.alertView.frame.height)
        }
        containerView.addSubview(alertController.view)
        
        UIView.animate(withDuration: 0.25,
                                   animations: {
                                    alertController.overlayView.alpha = 1.0
                                    if (alertController.isAlert()) {
                                        alertController.alertView.alpha = 1.0
                                        alertController.alertView.transform = CGAffineTransform(scaleX: 1.05, y: 1.05)
                                    } else {
                                        let bounce = alertController.alertView.frame.height / 480 * 10.0 + 10.0
                                        alertController.alertView.transform = CGAffineTransform(translationX: 0, y: -bounce)
                                    }
        },
                                   completion: { finished in
                                    UIView.animate(withDuration: 0.2,
                                                               animations: {
                                                                alertController.alertView.transform = CGAffineTransform.identity
                                    },
                                                               completion: { finished in
                                                                if (finished) {
                                                                    transitionContext.completeTransition(true)
                                                                }
                                    })
        })
    }
    
    func dismissAnimateTransition(_ transitionContext: UIViewControllerContextTransitioning) {
        
        let alertController = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.from) as! DOAlertController
        
        UIView.animate(withDuration: self.transitionDuration(using: transitionContext),
                                   animations: {
                                    alertController.overlayView.alpha = 0.0
                                    if (alertController.isAlert()) {
                                        alertController.alertView.alpha = 0.0
                                        alertController.alertView.transform = CGAffineTransform(scaleX: 0.9, y: 0.9)
                                    } else {
                                        alertController.containerView.transform = CGAffineTransform(translationX: 0, y: alertController.alertView.frame.height)
                                    }
        },
                                   completion: { finished in
                                    transitionContext.completeTransition(true)
        })
    }
}

// MARK: DOAlertController Class
@objc(DOAlertController)
open class DOAlertController : UIViewController, UITextFieldDelegate, UIViewControllerTransitioningDelegate {
    
    // Message
    open var message: String?
    
    // AlertController Style
    fileprivate(set) var preferredStyle: DOAlertControllerStyle?
    
    // OverlayView
    fileprivate var overlayView = UIView()
    open var overlayColor = UIColor(red:0, green:0, blue:0, alpha:0.5)
    
    // ContainerView
    fileprivate var containerView = UIView()
    fileprivate var containerViewBottomSpaceConstraint: NSLayoutConstraint?
    
    // AlertView
    open var alertView = UIView()
    open var alertViewBgColor = UIColor(red:239/255, green:240/255, blue:242/255, alpha:1.0)
    fileprivate var alertViewWidth: CGFloat = 270.0
    fileprivate var alertViewHeightConstraint: NSLayoutConstraint?
    fileprivate var alertViewPadding: CGFloat = 15.0
    fileprivate var innerContentWidth: CGFloat = 240.0
    fileprivate let actionSheetBounceHeight: CGFloat = 20.0
    
    // TextAreaScrollView
    fileprivate var textAreaScrollView = UIScrollView()
    fileprivate var textAreaHeight: CGFloat = 0.0
    
    // TextAreaView
    fileprivate var textAreaView = UIView()
    
    // TextContainer
    fileprivate var textContainer = UIView()
    fileprivate var textContainerHeightConstraint: NSLayoutConstraint?
    
    // TitleLabel
    open var titleLabel = UILabel()
    open var titleFont = UIFont(name: "HelveticaNeue-Bold", size: 18)
    open var titleTextColor = UIColor(red:77/255, green:77/255, blue:77/255, alpha:1.0)
    
    // MessageView
    open var messageView = UILabel()
    open var messageFont = UIFont(name: "HelveticaNeue", size: 15)
    open var messageTextColor = UIColor(red:77/255, green:77/255, blue:77/255, alpha:1.0)
    
    // TextFieldContainerView
    open var textFieldContainerView = UIView()
    open var textFieldBorderColor = UIColor(red: 203.0/255, green: 203.0/255, blue: 203.0/255, alpha: 1.0)
    
    // TextFields
    fileprivate(set) var textFields: [AnyObject]?
    fileprivate let textFieldHeight: CGFloat = 30.0
    open var textFieldBgColor = UIColor.white
    fileprivate let textFieldCornerRadius: CGFloat = 4.0
    
    // ButtonAreaScrollView
    fileprivate var buttonAreaScrollView = UIScrollView()
    fileprivate var buttonAreaScrollViewHeightConstraint: NSLayoutConstraint?
    fileprivate var buttonAreaHeight: CGFloat = 0.0
    
    // ButtonAreaView
    fileprivate var buttonAreaView = UIView()
    
    // ButtonContainer
    fileprivate var buttonContainer = UIView()
    fileprivate var buttonContainerHeightConstraint: NSLayoutConstraint?
    fileprivate let buttonHeight: CGFloat = 44.0
    fileprivate var buttonMargin: CGFloat = 10.0
    
    // Actions
    open fileprivate(set) var actions: [AnyObject] = []
    
    // Buttons
    open var buttons = [UIButton]()
    open var buttonFont: [DOAlertActionStyle : UIFont] = [
        .default : UIFont(name: "HelveticaNeue-Bold", size: 16) ?? UIFont.systemFont(ofSize: 16),
        .cancel  : UIFont(name: "HelveticaNeue-Bold", size: 16) ?? UIFont.systemFont(ofSize: 16),
        .destructive  : UIFont(name: "HelveticaNeue-Bold", size: 16) ?? UIFont.systemFont(ofSize: 16)
    ]
    open var buttonTextColor: [DOAlertActionStyle : UIColor] = [
        .default : UIColor.white,
        .cancel  : UIColor.white,
        .destructive  : UIColor.white
    ]
    open var buttonBgColor: [DOAlertActionStyle : UIColor] = [
        .default : UIColor(red:52/255, green:152/255, blue:219/255, alpha:1),
        .cancel  : UIColor(red:127/255, green:140/255, blue:141/255, alpha:1),
        .destructive  : UIColor(red:231/255, green:76/255, blue:60/255, alpha:1)
    ]
    open var buttonBgColorHighlighted: [DOAlertActionStyle : UIColor] = [
        .default : UIColor(red:74/255, green:163/255, blue:223/255, alpha:1),
        .cancel  : UIColor(red:140/255, green:152/255, blue:153/255, alpha:1),
        .destructive  : UIColor(red:234/255, green:97/255, blue:83/255, alpha:1)
    ]
    fileprivate var buttonCornerRadius: CGFloat = 4.0
    
    fileprivate var layoutFlg = false
    fileprivate var keyboardHeight: CGFloat = 0.0
    fileprivate var cancelButtonTag = 0
    
    // Initializer
    public convenience init(title: String?, message: String?, preferredStyle: DOAlertControllerStyle) {
        self.init(nibName: nil, bundle: nil)
        
        self.title = title
        self.message = message
        self.preferredStyle = preferredStyle
        
        self.providesPresentationContextTransitionStyle = true
        self.definesPresentationContext = true
        self.modalPresentationStyle = UIModalPresentationStyle.custom
        
        // NotificationCenter
        NotificationCenter.default.addObserver(self, selector: #selector(DOAlertController.handleAlertActionEnabledDidChangeNotification(_:)), name: NSNotification.Name(rawValue: DOAlertActionEnabledDidChangeNotification), object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(DOAlertController.handleKeyboardWillShowNotification(_:)), name: UIResponder.keyboardWillShowNotification, object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(DOAlertController.handleKeyboardWillHideNotification(_:)), name: UIResponder.keyboardWillHideNotification, object: nil)
        
        // Delegate
        self.transitioningDelegate = self
    }
    
    deinit {
        NotificationCenter.default.removeObserver(self)
    }
    
    override public init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) {
        super.init(nibName:nibNameOrNil, bundle:nibBundleOrNil)
    }
    
    required public init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    func currentOrientation() -> UIInterfaceOrientation {
        return UIScreen.main.bounds.size.width < UIScreen.main.bounds.size.height ? .portrait : .landscapeLeft
    }
    
    override open func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
    }
    
    override open func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        
        if (!isAlert() && cancelButtonTag != 0) {
            let tapGesture = UITapGestureRecognizer(target: self, action: #selector(DOAlertController.handleContainerViewTapGesture(_:)))
            containerView.addGestureRecognizer(tapGesture)
        }
    }
    
    open override func viewWillLayoutSubviews() {
        super.viewWillLayoutSubviews()
        layoutView(self.presentingViewController)
    }
    
    
    open func layoutView(_ presenting: UIViewController?) {
        if (layoutFlg) { return }
        layoutFlg = true
        
        // Screen Size
        var screenSize = presenting != nil ? presenting!.view.bounds.size : UIScreen.main.bounds.size
        if ((UIDevice.current.systemVersion as NSString).floatValue < 8.0) {
            if (currentOrientation().isLandscape) {
                screenSize = CGSize(width: screenSize.height, height: screenSize.width)
            }
        }
        
        // variable for ActionSheet
        if (!isAlert()) {
            alertViewWidth =  screenSize.width
            alertViewPadding = 8.0
            innerContentWidth = (screenSize.height > screenSize.width) ? screenSize.width - alertViewPadding * 2 : screenSize.height - alertViewPadding * 2
            buttonMargin = 8.0
            buttonCornerRadius = 6.0
        }
        
        // self.view
        self.view.frame.size = screenSize
        
        // OverlayView
        self.view.addSubview(overlayView)
        
        // ContainerView
        self.view.addSubview(containerView)
        
        // AlertView
        containerView.addSubview(alertView)
        
        // TextAreaScrollView
        alertView.addSubview(textAreaScrollView)
        
        // TextAreaView
        textAreaScrollView.addSubview(textAreaView)
        
        // TextContainer
        textAreaView.addSubview(textContainer)
        
        // ButtonAreaScrollView
        alertView.addSubview(buttonAreaScrollView)
        
        // ButtonAreaView
        buttonAreaScrollView.addSubview(buttonAreaView)
        
        // ButtonContainer
        buttonAreaView.addSubview(buttonContainer)
        
        //------------------------------
        // Layout Constraint
        //------------------------------
        overlayView.translatesAutoresizingMaskIntoConstraints = false
        containerView.translatesAutoresizingMaskIntoConstraints = false
        alertView.translatesAutoresizingMaskIntoConstraints = false
        textAreaScrollView.translatesAutoresizingMaskIntoConstraints = false
        textAreaView.translatesAutoresizingMaskIntoConstraints = false
        textContainer.translatesAutoresizingMaskIntoConstraints = false
        buttonAreaScrollView.translatesAutoresizingMaskIntoConstraints = false
        buttonAreaView.translatesAutoresizingMaskIntoConstraints = false
        buttonContainer.translatesAutoresizingMaskIntoConstraints = false
        
        // self.view
        let overlayViewTopSpaceConstraint = NSLayoutConstraint(item: overlayView, attribute: .top, relatedBy: .equal, toItem: self.view, attribute: .top, multiplier: 1.0, constant: 0.0)
        let overlayViewRightSpaceConstraint = NSLayoutConstraint(item: overlayView, attribute: .right, relatedBy: .equal, toItem: self.view, attribute: .right, multiplier: 1.0, constant: 0.0)
        let overlayViewLeftSpaceConstraint = NSLayoutConstraint(item: overlayView, attribute: .left, relatedBy: .equal, toItem: self.view, attribute: .left, multiplier: 1.0, constant: 0.0)
        let overlayViewBottomSpaceConstraint = NSLayoutConstraint(item: overlayView, attribute: .bottom, relatedBy: .equal, toItem: self.view, attribute: .bottom, multiplier: 1.0, constant: 0.0)
        let containerViewTopSpaceConstraint = NSLayoutConstraint(item: containerView, attribute: .top, relatedBy: .equal, toItem: self.view, attribute: .top, multiplier: 1.0, constant: 0.0)
        let containerViewRightSpaceConstraint = NSLayoutConstraint(item: containerView, attribute: .right, relatedBy: .equal, toItem: self.view, attribute: .right, multiplier: 1.0, constant: 0.0)
        let containerViewLeftSpaceConstraint = NSLayoutConstraint(item: containerView, attribute: .left, relatedBy: .equal, toItem: self.view, attribute: .left, multiplier: 1.0, constant: 0.0)
        containerViewBottomSpaceConstraint = NSLayoutConstraint(item: containerView, attribute: .bottom, relatedBy: .equal, toItem: self.view, attribute: .bottom, multiplier: 1.0, constant: 0.0)
        self.view.addConstraints([overlayViewTopSpaceConstraint, overlayViewRightSpaceConstraint, overlayViewLeftSpaceConstraint, overlayViewBottomSpaceConstraint, containerViewTopSpaceConstraint, containerViewRightSpaceConstraint, containerViewLeftSpaceConstraint, containerViewBottomSpaceConstraint!])
        
        if (isAlert()) {
            // ContainerView
            let alertViewCenterXConstraint = NSLayoutConstraint(item: alertView, attribute: .centerX, relatedBy: .equal, toItem: containerView, attribute: .centerX, multiplier: 1.0, constant: 0.0)
            let alertViewCenterYConstraint = NSLayoutConstraint(item: alertView, attribute: .centerY, relatedBy: .equal, toItem: containerView, attribute: .centerY, multiplier: 1.0, constant: 0.0)
            containerView.addConstraints([alertViewCenterXConstraint, alertViewCenterYConstraint])
            
            // AlertView
            let alertViewWidthConstraint = NSLayoutConstraint(item: alertView, attribute: .width, relatedBy: .equal, toItem: nil, attribute: .width, multiplier: 1.0, constant: alertViewWidth)
            alertViewHeightConstraint = NSLayoutConstraint(item: alertView, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .height, multiplier: 1.0, constant: 1000.0)
            alertView.addConstraints([alertViewWidthConstraint, alertViewHeightConstraint!])
            
        } else {
            // ContainerView
            let alertViewCenterXConstraint = NSLayoutConstraint(item: alertView, attribute: .centerX, relatedBy: .equal, toItem: containerView, attribute: .centerX, multiplier: 1.0, constant: 0.0)
            let alertViewBottomSpaceConstraint = NSLayoutConstraint(item: alertView, attribute: .bottom, relatedBy: .equal, toItem: containerView, attribute: .bottom, multiplier: 1.0, constant: actionSheetBounceHeight)
            let alertViewWidthConstraint = NSLayoutConstraint(item: alertView, attribute: .width, relatedBy: .equal, toItem: containerView, attribute: .width, multiplier: 1.0, constant: 0.0)
            containerView.addConstraints([alertViewCenterXConstraint, alertViewBottomSpaceConstraint, alertViewWidthConstraint])
            
            // AlertView
            alertViewHeightConstraint = NSLayoutConstraint(item: alertView, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .height, multiplier: 1.0, constant: 1000.0)
            alertView.addConstraint(alertViewHeightConstraint!)
        }
        
        // AlertView
        let textAreaScrollViewTopSpaceConstraint = NSLayoutConstraint(item: textAreaScrollView, attribute: .top, relatedBy: .equal, toItem: alertView, attribute: .top, multiplier: 1.0, constant: 0.0)
        let textAreaScrollViewRightSpaceConstraint = NSLayoutConstraint(item: textAreaScrollView, attribute: .right, relatedBy: .equal, toItem: alertView, attribute: .right, multiplier: 1.0, constant: 0.0)
        let textAreaScrollViewLeftSpaceConstraint = NSLayoutConstraint(item: textAreaScrollView, attribute: .left, relatedBy: .equal, toItem: alertView, attribute: .left, multiplier: 1.0, constant: 0.0)
        let textAreaScrollViewBottomSpaceConstraint = NSLayoutConstraint(item: textAreaScrollView, attribute: .bottom, relatedBy: .equal, toItem: buttonAreaScrollView, attribute: .top, multiplier: 1.0, constant: 0.0)
        let buttonAreaScrollViewRightSpaceConstraint = NSLayoutConstraint(item: buttonAreaScrollView, attribute: .right, relatedBy: .equal, toItem: alertView, attribute: .right, multiplier: 1.0, constant: 0.0)
        let buttonAreaScrollViewLeftSpaceConstraint = NSLayoutConstraint(item: buttonAreaScrollView, attribute: .left, relatedBy: .equal, toItem: alertView, attribute: .left, multiplier: 1.0, constant: 0.0)
        let buttonAreaScrollViewBottomSpaceConstraint = NSLayoutConstraint(item: buttonAreaScrollView, attribute: .bottom, relatedBy: .equal, toItem: alertView, attribute: .bottom, multiplier: 1.0, constant: isAlert() ? 0.0 : -actionSheetBounceHeight)
        alertView.addConstraints([textAreaScrollViewTopSpaceConstraint, textAreaScrollViewRightSpaceConstraint, textAreaScrollViewLeftSpaceConstraint, textAreaScrollViewBottomSpaceConstraint, buttonAreaScrollViewRightSpaceConstraint, buttonAreaScrollViewLeftSpaceConstraint, buttonAreaScrollViewBottomSpaceConstraint])
        
        // TextAreaScrollView
        let textAreaViewTopSpaceConstraint = NSLayoutConstraint(item: textAreaView, attribute: .top, relatedBy: .equal, toItem: textAreaScrollView, attribute: .top, multiplier: 1.0, constant: 0.0)
        let textAreaViewRightSpaceConstraint = NSLayoutConstraint(item: textAreaView, attribute: .right, relatedBy: .equal, toItem: textAreaScrollView, attribute: .right, multiplier: 1.0, constant: 0.0)
        let textAreaViewLeftSpaceConstraint = NSLayoutConstraint(item: textAreaView, attribute: .left, relatedBy: .equal, toItem: textAreaScrollView, attribute: .left, multiplier: 1.0, constant: 0.0)
        let textAreaViewBottomSpaceConstraint = NSLayoutConstraint(item: textAreaView, attribute: .bottom, relatedBy: .equal, toItem: textAreaScrollView, attribute: .bottom, multiplier: 1.0, constant: 0.0)
        let textAreaViewWidthConstraint = NSLayoutConstraint(item: textAreaView, attribute: .width, relatedBy: .equal, toItem: textAreaScrollView, attribute: .width, multiplier: 1.0, constant: 0.0)
        textAreaScrollView.addConstraints([textAreaViewTopSpaceConstraint, textAreaViewRightSpaceConstraint, textAreaViewLeftSpaceConstraint, textAreaViewBottomSpaceConstraint, textAreaViewWidthConstraint])
        
        // TextArea
        let textAreaViewHeightConstraint = NSLayoutConstraint(item: textAreaView, attribute: .height, relatedBy: .equal, toItem: textContainer, attribute: .height, multiplier: 1.0, constant: 0.0)
        let textContainerTopSpaceConstraint = NSLayoutConstraint(item: textContainer, attribute: .top, relatedBy: .equal, toItem: textAreaView, attribute: .top, multiplier: 1.0, constant: 0.0)
        let textContainerCenterXConstraint = NSLayoutConstraint(item: textContainer, attribute: .centerX, relatedBy: .equal, toItem: textAreaView, attribute: .centerX, multiplier: 1.0, constant: 0.0)
        textAreaView.addConstraints([textAreaViewHeightConstraint, textContainerTopSpaceConstraint, textContainerCenterXConstraint])
        
        // TextContainer
        let textContainerWidthConstraint = NSLayoutConstraint(item: textContainer, attribute: .width, relatedBy: .equal, toItem: nil, attribute: .width, multiplier: 1.0, constant: innerContentWidth)
        textContainerHeightConstraint = NSLayoutConstraint(item: textContainer, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .height, multiplier: 1.0, constant: 0.0)
        textContainer.addConstraints([textContainerWidthConstraint, textContainerHeightConstraint!])
        
        // ButtonAreaScrollView
        buttonAreaScrollViewHeightConstraint = NSLayoutConstraint(item: buttonAreaScrollView, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .height, multiplier: 1.0, constant: 0.0)
        let buttonAreaViewTopSpaceConstraint = NSLayoutConstraint(item: buttonAreaView, attribute: .top, relatedBy: .equal, toItem: buttonAreaScrollView, attribute: .top, multiplier: 1.0, constant: 0.0)
        let buttonAreaViewRightSpaceConstraint = NSLayoutConstraint(item: buttonAreaView, attribute: .right, relatedBy: .equal, toItem: buttonAreaScrollView, attribute: .right, multiplier: 1.0, constant: 0.0)
        let buttonAreaViewLeftSpaceConstraint = NSLayoutConstraint(item: buttonAreaView, attribute: .left, relatedBy: .equal, toItem: buttonAreaScrollView, attribute: .left, multiplier: 1.0, constant: 0.0)
        let buttonAreaViewBottomSpaceConstraint = NSLayoutConstraint(item: buttonAreaView, attribute: .bottom, relatedBy: .equal, toItem: buttonAreaScrollView, attribute: .bottom, multiplier: 1.0, constant: 0.0)
        let buttonAreaViewWidthConstraint = NSLayoutConstraint(item: buttonAreaView, attribute: .width, relatedBy: .equal, toItem: buttonAreaScrollView, attribute: .width, multiplier: 1.0, constant: 0.0)
        buttonAreaScrollView.addConstraints([buttonAreaScrollViewHeightConstraint!, buttonAreaViewTopSpaceConstraint, buttonAreaViewRightSpaceConstraint, buttonAreaViewLeftSpaceConstraint, buttonAreaViewBottomSpaceConstraint, buttonAreaViewWidthConstraint])
        
        // ButtonArea
        let buttonAreaViewHeightConstraint = NSLayoutConstraint(item: buttonAreaView, attribute: .height, relatedBy: .equal, toItem: buttonContainer, attribute: .height, multiplier: 1.0, constant: 0.0)
        let buttonContainerTopSpaceConstraint = NSLayoutConstraint(item: buttonContainer, attribute: .top, relatedBy: .equal, toItem: buttonAreaView, attribute: .top, multiplier: 1.0, constant: 0.0)
        let buttonContainerCenterXConstraint = NSLayoutConstraint(item: buttonContainer, attribute: .centerX, relatedBy: .equal, toItem: buttonAreaView, attribute: .centerX, multiplier: 1.0, constant: 0.0)
        buttonAreaView.addConstraints([buttonAreaViewHeightConstraint, buttonContainerTopSpaceConstraint, buttonContainerCenterXConstraint])
        
        // ButtonContainer
        let buttonContainerWidthConstraint = NSLayoutConstraint(item: buttonContainer, attribute: .width, relatedBy: .equal, toItem: nil, attribute: .width, multiplier: 1.0, constant: innerContentWidth)
        buttonContainerHeightConstraint = NSLayoutConstraint(item: buttonContainer, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .height, multiplier: 1.0, constant: 0.0)
        buttonContainer.addConstraints([buttonContainerWidthConstraint, buttonContainerHeightConstraint!])
        
        //------------------------------
        // Layout & Color Settings
        //------------------------------
        overlayView.backgroundColor = overlayColor
        alertView.backgroundColor = alertViewBgColor
        
        //------------------------------
        // TextArea Layout
        //------------------------------
        let hasTitle: Bool = title != nil && title != ""
        let hasMessage: Bool = message != nil && message != ""
        let hasTextField: Bool = textFields != nil && textFields!.count > 0
        
        var textAreaPositionY: CGFloat = alertViewPadding
        if (!isAlert()) {textAreaPositionY += alertViewPadding}
        
        // TitleLabel
        if (hasTitle) {
            titleLabel.frame.size = CGSize(width: innerContentWidth, height: 0.0)
            titleLabel.numberOfLines = 0
            titleLabel.textAlignment = .center
            titleLabel.font = titleFont
            titleLabel.textColor = titleTextColor
            titleLabel.text = title
            titleLabel.sizeToFit()
            titleLabel.frame = CGRect(x: 0, y: textAreaPositionY, width: innerContentWidth, height: titleLabel.frame.height)
            textContainer.addSubview(titleLabel)
            textAreaPositionY += titleLabel.frame.height + 5.0
        }
        
        // MessageView
        if (hasMessage) {
            messageView.frame.size = CGSize(width: innerContentWidth, height: 0.0)
            messageView.numberOfLines = 0
            messageView.textAlignment = .center
            messageView.font = messageFont
            messageView.textColor = messageTextColor
            messageView.text = message
            messageView.sizeToFit()
            messageView.frame = CGRect(x: 0, y: textAreaPositionY, width: innerContentWidth, height: messageView.frame.height)
            textContainer.addSubview(messageView)
            textAreaPositionY += messageView.frame.height + 5.0
        }
        
        // TextFieldContainerView
        if (hasTextField) {
            if (hasTitle || hasMessage) { textAreaPositionY += 5.0 }
            
            textFieldContainerView.backgroundColor = textFieldBorderColor
            textFieldContainerView.layer.masksToBounds = true
            textFieldContainerView.layer.cornerRadius = textFieldCornerRadius
            textFieldContainerView.layer.borderWidth = 0.5
            textFieldContainerView.layer.borderColor = textFieldBorderColor.cgColor
            textContainer.addSubview(textFieldContainerView)
            
            var textFieldContainerHeight: CGFloat = 0.0
            
            // TextFields
            for (_, obj) in (textFields!).enumerated() {
                let textField = obj as! UITextField
                textField.frame = CGRect(x: 0.0, y: textFieldContainerHeight, width: innerContentWidth, height: textField.frame.height)
                textFieldContainerHeight += textField.frame.height + 0.5
            }
            
            textFieldContainerHeight -= 0.5
            textFieldContainerView.frame = CGRect(x: 0.0, y: textAreaPositionY, width: innerContentWidth, height: textFieldContainerHeight)
            textAreaPositionY += textFieldContainerHeight + 5.0
        }
        
        if (!hasTitle && !hasMessage && !hasTextField) {
            textAreaPositionY = 0.0
        }
        
        // TextAreaScrollView
        textAreaHeight = textAreaPositionY
        textAreaScrollView.contentSize = CGSize(width: alertViewWidth, height: textAreaHeight)
        textContainerHeightConstraint?.constant = textAreaHeight
        
        //------------------------------
        // ButtonArea Layout
        //------------------------------
        var buttonAreaPositionY: CGFloat = buttonMargin
        
        // Buttons
        if (isAlert() && buttons.count == 2) {
            let buttonWidth = (innerContentWidth - buttonMargin) / 2
            var buttonPositionX: CGFloat = 0.0
            for button in buttons {
                let action = actions[button.tag - 1] as! DOAlertAction
                button.titleLabel?.font = buttonFont[action.style]
                button.setTitleColor(buttonTextColor[action.style], for: UIControl.State())
                button.setBackgroundImage(createImageFromUIColor(buttonBgColor[action.style]!), for: UIControl.State())
                button.setBackgroundImage(createImageFromUIColor(buttonBgColorHighlighted[action.style]!), for: .highlighted)
                button.setBackgroundImage(createImageFromUIColor(buttonBgColorHighlighted[action.style]!), for: .selected)
                button.frame = CGRect(x: buttonPositionX, y: buttonAreaPositionY, width: buttonWidth, height: buttonHeight)
                buttonPositionX += buttonMargin + buttonWidth
            }
            buttonAreaPositionY += buttonHeight
        } else {
            for button in buttons {
                let action = actions[button.tag - 1] as! DOAlertAction
                if (action.style != DOAlertActionStyle.cancel) {
                    button.titleLabel?.font = buttonFont[action.style]
                    button.setTitleColor(buttonTextColor[action.style], for: UIControl.State())
                    button.setBackgroundImage(createImageFromUIColor(buttonBgColor[action.style]!), for: UIControl.State())
                    button.setBackgroundImage(createImageFromUIColor(buttonBgColorHighlighted[action.style]!), for: .highlighted)
                    button.setBackgroundImage(createImageFromUIColor(buttonBgColorHighlighted[action.style]!), for: .selected)
                    button.frame = CGRect(x: 0, y: buttonAreaPositionY, width: innerContentWidth, height: buttonHeight)
                    buttonAreaPositionY += buttonHeight + buttonMargin
                } else {
                    cancelButtonTag = button.tag
                }
            }
            
            // Cancel Button
            if (cancelButtonTag != 0) {
                if (!isAlert() && buttons.count > 1) {
                    buttonAreaPositionY += buttonMargin
                }
                let button = buttonAreaScrollView.viewWithTag(cancelButtonTag) as! UIButton
                let action = actions[cancelButtonTag - 1] as! DOAlertAction
                button.titleLabel?.font = buttonFont[action.style]
                button.setTitleColor(buttonTextColor[action.style], for: UIControl.State())
                button.setBackgroundImage(createImageFromUIColor(buttonBgColor[action.style]!), for: UIControl.State())
                button.setBackgroundImage(createImageFromUIColor(buttonBgColorHighlighted[action.style]!), for: .highlighted)
                button.setBackgroundImage(createImageFromUIColor(buttonBgColorHighlighted[action.style]!), for: .selected)
                button.frame = CGRect(x: 0, y: buttonAreaPositionY, width: innerContentWidth, height: buttonHeight)
                buttonAreaPositionY += buttonHeight + buttonMargin
            }
            buttonAreaPositionY -= buttonMargin
        }
        buttonAreaPositionY += alertViewPadding
        
        if (buttons.count == 0) {
            buttonAreaPositionY = 0.0
        }
        
        // ButtonAreaScrollView Height
        buttonAreaHeight = buttonAreaPositionY
        buttonAreaScrollView.contentSize = CGSize(width: alertViewWidth, height: buttonAreaHeight)
        buttonContainerHeightConstraint?.constant = buttonAreaHeight
        
        //------------------------------
        // AlertView Layout
        //------------------------------
        // AlertView Height
        reloadAlertViewHeight()
        alertView.frame.size = CGSize(width: alertViewWidth, height: alertViewHeightConstraint?.constant ?? 150)
    }
    
    // Reload AlertView Height
    func reloadAlertViewHeight() {
        
        var screenSize = self.presentingViewController != nil ? self.presentingViewController!.view.bounds.size : UIScreen.main.bounds.size
        if ((UIDevice.current.systemVersion as NSString).floatValue < 8.0) {
            if (currentOrientation().isLandscape) {
                screenSize = CGSize(width: screenSize.height, height: screenSize.width)
            }
        }
        let maxHeight = screenSize.height - keyboardHeight
        
        // for avoiding constraint error
        buttonAreaScrollViewHeightConstraint?.constant = 0.0
        
        // AlertView Height Constraint
        var alertViewHeight = textAreaHeight + buttonAreaHeight
        if (alertViewHeight > maxHeight) {
            alertViewHeight = maxHeight
        }
        if (!isAlert()) {
            alertViewHeight += actionSheetBounceHeight
        }
        alertViewHeightConstraint?.constant = alertViewHeight
        
        // ButtonAreaScrollView Height Constraint
        var buttonAreaScrollViewHeight = buttonAreaHeight
        if (buttonAreaScrollViewHeight > maxHeight) {
            buttonAreaScrollViewHeight = maxHeight
        }
        buttonAreaScrollViewHeightConstraint?.constant = buttonAreaScrollViewHeight
    }
    
    // Button Tapped Action
    @objc func buttonTapped(_ sender: UIButton) {
        sender.isSelected = true
        let action = actions[sender.tag - 1] as! DOAlertAction
        if (action.handler != nil) {
            action.handler(action)
        }
        self.dismiss(animated: true, completion: nil)
    }
    
    // Handle ContainerView tap gesture
    @objc func handleContainerViewTapGesture(_ sender: AnyObject) {
        // cancel action
        let action = actions[cancelButtonTag - 1] as! DOAlertAction
        if (action.handler != nil) {
            action.handler(action)
        }
        self.dismiss(animated: true, completion: nil)
    }
    
    // UIColor -> UIImage
    func createImageFromUIColor(_ color: UIColor) -> UIImage {
        let rect = CGRect(x: 0, y: 0, width: 1, height: 1)
        UIGraphicsBeginImageContext(rect.size)
        let contextRef: CGContext = UIGraphicsGetCurrentContext()!
        contextRef.setFillColor(color.cgColor)
        contextRef.fill(rect)
        let img: UIImage = UIGraphicsGetImageFromCurrentImageContext()!
        UIGraphicsEndImageContext()
        return img
    }
    
    // MARK : Handle NSNotification Method
    
    @objc func handleAlertActionEnabledDidChangeNotification(_ notification: Notification) {
        for i in 0..<buttons.count {
            buttons[i].isEnabled = actions[i].isEnabled
        }
    }
    
    @objc func handleKeyboardWillShowNotification(_ notification: Notification) {
        if let userInfo = notification.userInfo as? [String: NSValue],
            let keyboardSize = userInfo[UIResponder.keyboardFrameEndUserInfoKey]?.cgRectValue.size {
            var _keyboardSize = keyboardSize
            if ((UIDevice.current.systemVersion as NSString).floatValue < 8.0) {
                if (currentOrientation().isLandscape) {
                    _keyboardSize = CGSize(width: _keyboardSize.height, height: _keyboardSize.width)
                }
            }
            keyboardHeight = _keyboardSize.height
            reloadAlertViewHeight()
            containerViewBottomSpaceConstraint?.constant = -keyboardHeight
            UIView.animate(withDuration: 0.25, animations: {
                self.view.layoutIfNeeded()
            })
        }
    }
    
    @objc func handleKeyboardWillHideNotification(_ notification: Notification) {
        keyboardHeight = 0.0
        reloadAlertViewHeight()
        containerViewBottomSpaceConstraint?.constant = keyboardHeight
        UIView.animate(withDuration: 0.25, animations: {
            self.view.layoutIfNeeded()
        })
    }
    
    // MARK: Public Methods
    
    // Attaches an action object to the alert or action sheet.
    open func addAction(_ action: DOAlertAction) {
        // Error
        if (action.style == DOAlertActionStyle.cancel) {
            for ac in actions as! [DOAlertAction] {
                if (ac.style == DOAlertActionStyle.cancel) {
                    let error: NSError? = nil
                    NSException.raise(NSExceptionName(rawValue: "NSInternalInconsistencyException"), format:"DOAlertController can only have one action with a style of DOAlertActionStyleCancel", arguments:getVaList([error ?? "nil"]))
                    return
                }
            }
        }
        // Add Action
        actions.append(action)
        
        // Add Button
        let button = UIButton()
        button.layer.masksToBounds = true
        button.setTitle(action.title, for: UIControl.State())
        button.isEnabled = action.enabled
        button.layer.cornerRadius = buttonCornerRadius
        button.addTarget(self, action: #selector(DOAlertController.buttonTapped(_:)), for: .touchUpInside)
        button.tag = buttons.count + 1
        buttons.append(button)
        buttonContainer.addSubview(button)
    }
    
    // Adds a text field to an alert.
    open func addTextFieldWithConfigurationHandler(_ configurationHandler: ((UITextField?) -> Void)!) {
        
        // You can add a text field only if the preferredStyle property is set to DOAlertControllerStyle.Alert.
        if (!isAlert()) {
            let error: NSError? = nil
            NSException.raise(NSExceptionName(rawValue: "NSInternalInconsistencyException"), format: "Text fields can only be added to an alert controller of style DOAlertControllerStyleAlert", arguments:getVaList([error ?? "nil"]))
            return
        }
        if (textFields == nil) {
            textFields = []
        }
        
        let textField = UITextField()
        textField.frame.size = CGSize(width: innerContentWidth, height: textFieldHeight)
        textField.borderStyle = UITextField.BorderStyle.none
        textField.backgroundColor = textFieldBgColor
        textField.delegate = self
        
        if ((configurationHandler) != nil) {
            configurationHandler(textField)
        }
        
        textFields!.append(textField)
        textFieldContainerView.addSubview(textField)
    }
    
    open func isAlert() -> Bool { return preferredStyle == .alert }
    
    // MARK: UITextFieldDelegate Methods
    
    open func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        if (textField.canResignFirstResponder) {
            textField.resignFirstResponder()
            self.dismiss(animated: true, completion: nil)
        }
        return true
    }
    
    // MARK: UIViewControllerTransitioningDelegate Methods
    open
    func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        layoutView(presenting)
        return DOAlertAnimation(isPresenting: true)
    }
    
    open func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        return DOAlertAnimation(isPresenting: false)
    }
}

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