iOS手勢處理由UIGestureRecognizer控制，不同手勢有這個(gè)類的不同子類處理，不同手勢處理有不同的相關(guān)屬性。

手勢處理的步驟一般：

1. 初始化手勢，并添加到需要手勢的View中
2. 添加手勢回調(diào)方法

UITapGestureRecognizer

屬性numberOfTapsRequired表示點(diǎn)擊次數(shù)，屬性numberOfTouchesRequired表示點(diǎn)擊手指數(shù)。

var isChange = false
...
let tap = UITapGestureRecognizer(target: self, action: #selector(ViewController.tap(tap:)))
tap.numberOfTapsRequired = 2
...
imageView.addGestureRecognizer(tap)
...

@objc func tap(tap: UITapGestureRecognizer) {
    let center = imageView.center
    if isChange {
        imageView.frame.size.width /= 2
        imageView.frame.size.height /= 2
        imageView.center = center
        isChange = false
    } else {
        imageView.frame.size.width *= 2
        imageView.frame.size.height *= 2
        imageView.center = center
        isChange = true
    }
}

UIPanGestureRecognizer

let pan = UIPanGestureRecognizer(target: self, action: #selector(ViewController.pan(pan:)))

    @objc func pan(pan: UIPanGestureRecognizer) {
        if pan.state == .began || pan.state == .changed {
            // 移動(dòng)后的變化（變化值類似向量）
            let translation = pan.translation(in: imageView.superview)
            print(translation)
            imageView.center = CGPoint(x: imageView.center.x + translation.x, y: imageView.center.y  + translation.y)
            // view移動(dòng)后，把上一步的移動(dòng)值變?yōu)?，否則移動(dòng)值為遞增
            pan.setTranslation(CGPoint.zero, in: imageView.superview)
        }
    }

UIRotationGestureRecognizer

    let rotation = UIRotationGestureRecognizer(target: self, action: #selector(ViewController.rotation(rotation:)))

    @objc func rotation(rotation: UIRotationGestureRecognizer) {
        if rotation.state == .began || rotation.state == .changed {
            imageView.transform = CGAffineTransform(rotationAngle: rotation.rotation)
        }
    }

UISwipeGestureRecognizer

    let swipe = UISwipeGestureRecognizer(target: self, action: #selector(ViewController.swipe(swipe:)))
    swipe.direction = .up
    swipe.numberOfTouchesRequired = 3

    @objc func swipe(swipe: UISwipeGestureRecognizer) {
        print("掃的方向：\(swipe.direction),掃的手指數(shù)：\(swipe.numberOfTouchesRequired)")
    }

UILongPressGestureRecognizer

numberOfTouchesRequired 長按的指頭數(shù)
minimumPressDuratio 長按最小時(shí)間（秒）

    let long = UILongPressGestureRecognizer(target: self, action: #selector(ViewController.long(long:)))
    long.numberOfTouchesRequired = 2
    long.minimumPressDuration = 1

    @objc func long(long: UILongPressGestureRecognizer) {
        print("長按手勢，長按字頭數(shù)為\(long.numberOfTouchesRequired)")
    }

UIScreenEdgePanGestureRecognizer

    let screenEdge = UIScreenEdgePanGestureRecognizer(target: self, action: #selector(ViewController.screenEdage(screenEdage:)))
    screenEdge.edges = .left

    @objc func screenEdage(screenEdage: UIScreenEdgePanGestureRecognizer) {
        print("屏幕邊緣滑動(dòng)手勢：\(screenEdage.edges)")
    }

詳細(xì)代碼： GestureDemo