ios - UIGestureRecognizer 识别订单问题

Question

我有一个红色视图和一个绿色视图（绿色视图是 redview 的子视图），并且我为它们中的每一个添加了一个gestureRecognizer。

并且 grestureRecognizer 都shouldRecognizeSimultaneouslyWith返回 YES。

但是当我点击绿色视图时，首先调用了红色视图的手势委托方法shouldRecognizeSimultaneouslyWith 。

因为我认为命中测试视图应该是绿色视图。所以绿色视图shouldRecognizeSimultaneouslyWith应该是第一个。

iOS 如何决定首先识别哪个 grestureRecognizer ？

发布代码并打印日志：

class GreenView: UIView,UIGestureRecognizerDelegate{
    override func awakeFromNib() {
        let gesture = UITapGestureRecognizer(target: self, action: #selector(greenTap))
        gesture.delegate = self
        self.addGestureRecognizer(gesture)
    }
    
    @objc func greenTap(){
        print("greenTap")
    }
    
    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
       print("greenTap shouldRecognizeSimultaneouslyWith")

        return true
    }
    
    override func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
                print("green gestureRecognizerShouldBegin")
        return super.gestureRecognizerShouldBegin(gestureRecognizer)
    }
}


class RedView: UIView,UIGestureRecognizerDelegate{
    override func awakeFromNib() {
        let gesture = UITapGestureRecognizer(target: self, action: #selector(redTap))
        gesture.delegate = self
        self.addGestureRecognizer(gesture)
    }
    
    @objc func redTap(){
        print("redTap")
    }
    
    override func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
                print("redTap gestureRecognizerShouldBegin")
        return super.gestureRecognizerShouldBegin(gestureRecognizer)
    }
    
    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
       print("redTap shouldRecognizeSimultaneouslyWith")

        return true
    }
}

和打印是：

green gestureRecognizerShouldBegin
redTap gestureRecognizerShouldBegin
green gestureRecognizerShouldBegin
redTap shouldRecognizeSimultaneouslyWith
greenTap shouldRecognizeSimultaneouslyWith
redTap
greenTap

我们可以看到 redview(superview) 的 shouldRecognizeSimultaneouslyWith 和 action 方法在 greenview(subview) 的方法之前被调用

标签： iosuikituigesturerecognizer

Answer 1

不要将绿色视图添加为红色视图的子视图。只需在其上方的红色视图之外添加绿色视图并将约束居中到红色视图