从重叠的视图触发UITapGestureRecognizers

Question

我有一个主视图和该主视图的4个子视图，它们都具有其UITapGestureRecognizer，当我点击一个子视图时，如何触发两个视图。以下示例，

如果我点击以查看1所需的日志，将是：

subview1 is clicked
MainView is clicked

我的代码

override func viewDidLoad() {

    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    let mainGesture = UITapGestureRecognizer(target: self, action: #selector(mainGestureActivated))

    self.view.addGestureRecognizer(mainGesture)

    let subGesture = UITapGestureRecognizer(target: self, action: #selector(subViewGestureActivated))

    self.subview1.addGestureRecognizer(subGesture)


}

@objc func mainGestureActivated(){
    print("MainView Clicked")
}

@objc func subViewGestureActivated(){
    print("Subview Clicked")
}

仅打印单击的子视图！因为main正在封装其他手势，是否有可能触发两个手势识别器。

Answer 1

首先，您应该在VC中遵循UIGestureRecognizerDelegate，然后实现shouldRecognizeSimultaneouslyWith的委托函数。在函数内部，应该检测gestureRecognizer和otherGestureRecognizer是否是您想要的，如果是，则应允许它们同时工作，

• 符合委托要求，并在viewDidLoad之外声明手势识别器（因为稍后需要在委托方法中访问它们）。

  var mainGestureRecognizer = UITapGestureRecognizer() var subGestureRecognizer = UITapGestureRecognizer()

• 初始化您的识别器，并将您的VC设置为其代表：

  mainGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(mainGestureActivated))
  subGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(subViewGestureActivated))
  mainGestureRecognizer.delegate = self
  subGestureRecognizer.delegate = self
  

• 实现上述委托函数以允许同时识别subView和mainView：

  func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
      if gestureRecognizer == subGestureRecognizer && otherGestureRecognizer == mainGestureRecognizer {
          return true
      }
  
      return false
  }
  

如果希望它可用于4个不同的子视图，则应与其他方法一起检查委托方法中的语句。