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知っておきたかったUIGestureRecognizerとUITouchの違い

Maika Yamada
November 15, 2018
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 知っておきたかったUIGestureRecognizerとUITouchの違い

Maika Yamada

November 15, 2018
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  1. UIGestureRecognizerとは ✎ ターゲットのViewでどのような操作 が行われたか判定して検知してくれ るクラス ✎ Apple曰く7種類 ‘The concrete subclasses

    of UIGestureRecognizer are the following: •UITapGestureRecognizer •UIPinchGestureRecognizer •UIRotationGestureRecognizer •UISwipeGestureRecognizer •UIPanGestureRecognizer •UIScreenEdgePanGestureRecognizer •UILongPressGestureRecognizer ’
  2. UIResponderとは ✎ ユーザーのあらゆる操作(イベント) に応答するクラス ✎ 今回は以下のメソッドが比較対象 ’ func touchesBegan(Set<UITouch>, with:

    UIEvent?) Tells this object that one or more new touches occurred in a view or window. func touchesMoved(Set<UITouch>, with: UIEvent?) Tells the responder when one or more touches associated with an event changed. func touchesEnded(Set<UITouch>, with: UIEvent?) Tells the responder when one or more fingers are raised from a view or window. func touchesCancelled(Set<UITouch>, with: UIEvent?) Tells the responder when a system event (such as a system alert) cancels a touch sequence. ‘
  3. 本題 class TouchView: UIView { var startTime: Date? override open

    func touchesBegan( _ touches: Set<UITouch>, with event: UIEvent?) { startTime = Date() } }
  4. 本題 class ViewController: UIViewController { @IBOutlet var mainView: TouchView! override

    func viewDidLoad() { super.viewDidLoad() let tapGesture = UITapGestureRecognizer(target: self, action: #selector(self.tapped(_:))) mainView.addGestureRecognizer(tapGesture) } @objc func tapped(_ sender: UITapGestureRecognizer) { let elapsedTime = Date().timeIntervalSince(mainView.startTime!) print("touchesBegan 〜 Selector: \(elapsedTime)") } }
  5. 本題 端末:iPhone XS Simulator touchesBegan 〜 Selector: 0.005764961242675781 touchesBegan 〜

    Selector: 0.6473150253295898 touchesBegan 〜 Selector: 0.19945406913757324 touchesBegan 〜 Selector: 0.22349095344543457 touchesBegan 〜 Selector: 0.008154988288879395 touchesBegan 〜 Selector: 0.2873830795288086 touchesBegan 〜 Selector: 0.11172294616699219 touchesBegan 〜 Selector: 0.38307297229766846 touchesBegan 〜 Selector: 0.005489945411682129 touchesBegan 〜 Selector: 0.15140306949615479
  6. 本題 ✎ UIResponderの処理を前提として、 どのような操作がされたかを判定 ‘ The usual sequence of actions

    in gesture recognition follows a path determined by default values of the cancelsTouchesInView, delaysTouchesBegan, delaysTouchesEnded properties: ‘ UIResponderの touchesCancel, touchesBegan, touchesMoved, touchesEnded が前提