iOS手势处理由UIGestureRecognizer控制，不同手势有这个类的不同子类处理，不同手势处理有不同的相关属性。

子类 描述
UITapGestureRecognizer 点击手势
UIPanGestureRecognizer 跟着手移动手势
UIPinchGestureRecognizer 缩放手势
UIRotationGestureRecognizer 旋转手势
UISwipeGestureRecognizer 轻扫手势
UILongPressGestureRecognizer 长按手势
UIScreenEdgePanGestureRecognizer 屏幕边缘滑动手势

手势处理的步骤一般：

  1. 初始化手势，并添加到需要手势的View中
  2. 添加手势回调方法

UITapGestureRecognizer

属性numberOfTapsRequired表示点击次数，属性numberOfTouchesRequired表示点击手指数。

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22

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

1

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

 1
 2
 3
 4
 5
 6
 7
 8
 9
10

@objc func pan(pan: UIPanGestureRecognizer) {
    if pan.state == .began || pan.state == .changed {
        // 移动后的变化（变化值类似向量）
        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移动后，把上一步的移动值变为0，否则移动值为递增
        pan.setTranslation(CGPoint.zero, in: imageView.superview)
    }
}

UIRotationGestureRecognizer

1

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

1
2
3
4
5

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

UISwipeGestureRecognizer

1
2
3

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

1
2
3

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

UILongPressGestureRecognizer

numberOfTouchesRequired 长按的指头数 minimumPressDuratio 长按最小时间（秒）

1
2
3
4
5
6
7
8
9

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

...

@objc func long(long: UILongPressGestureRecognizer) {
    print("长按手势，长按字头数为\(long.numberOfTouchesRequired)")
}

UIScreenEdgePanGestureRecognizer

1
2

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

1
2
3

@objc func screenEdage(screenEdage: UIScreenEdgePanGestureRecognizer) {
    print("屏幕边缘滑动手势：\(screenEdage.edges)")
}

详细代码： GestureDemo