iOS_按钮 cancel 手势 跟 swipe上滑手势 冲突

问题

最近做需求遇到一个问题，设计想在播放器底部播控栏添加上滑手势，换起换台面板。但是因为播控栏上很多按钮，当手势起始位置为按钮内时上滑别会被识别为 UIButton 的 cancel 手势，导致无法换起面板。

搜索了一番，也没找到解决方案，最后自己各种猜测➕测试，得出一个解决方案：按钮点击事件改用 Tap 手势实现，扩展 UIView 在 touchesMoved 方法里判断手势方向是否为上滑。

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实现

1、实现 touchesMoved ，并新增 touchPoint 属性记录每次 touch 位置，并跟上一次比较，y 比上一次小，就判断为上滑
2、新增 didReceiveSwipeUp 属性，回调上滑事件

typealias MOSwipeUpCallback = () -> ()

struct MOAssociatedKeys {
    
    
    static var touchPointKey: String = "touchPoint"
    static var swipeUpCallbackKey: String = "swipeUpCallback"
}

extension UIView {
    
    
	
    public var touchPoint: CGPoint? {
    
    
        get {
    
    
            return objc_getAssociatedObject(self, &MOAssociatedKeys.touchPointKey) as? CGPoint
        }
        set {
    
    
            objc_setAssociatedObject(self, &MOAssociatedKeys.touchPointKey, newValue, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
        }
    }
    var didReceiveSwipeUp: MOSwipeUpCallback? {
    
    
        get {
    
    
            return objc_getAssociatedObject(self, &MOAssociatedKeys.swipeUpCallbackKey) as? MOSwipeUpCallback
        }
        set {
    
    
            objc_setAssociatedObject(self, &MOAssociatedKeys.swipeUpCallbackKey, newValue, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
        }
    }
    
    open override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
    
    
        super.touchesMoved(touches, with: event)
        guard let touch = touches.first else {
    
     return }
        
        let point = touch.location(in: self)
        
        if let touchPoint = self.touchPoint {
    
    
            if (touchPoint.y > point.y) {
    
    
                print("swipe up")
                guard let callback = self.didReceiveSwipeUp else {
    
     return }
                callback();
            }
        } else {
    
    
            self.touchPoint = point
        }
    }
}

使用

1、view 和 button 都可响应上滑手势

// MARK: - 解决：上滑手势 跟 按钮 cancel 手势 冲突
func swipeGestureTest() {
    
    

    let view = UIView(frame: self.view.bounds)
    view.backgroundColor = UIColor(white: 1, alpha: 0.5)
    view.isUserInteractionEnabled = true
    view.didReceiveSwipeUp = {
    
    
        print("did reveive swipe up")
    }
    self.view.addSubview(view)
    
    let btn = UIView(frame: .zero)
    let tap = UITapGestureRecognizer(target: self, action: #selector(didClickBtn))
    btn.addGestureRecognizer(tap)
    btn.backgroundColor = .red
    btn.didReceiveSwipeUp = {
    
    
        print("did reveive swipe up btn")
    }
    self.view.addSubview(btn)
    btn.snp.makeConstraints {
    
     make in
        make.top.left.equalTo(self.view).offset(200)
        make.height.width.equalTo(44.0)
    }
}

@objc func didClickBtn() {
    
    
    print("did clic button")
}

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Demo：swipeGestureTest() 方法