ios - 从重叠 View 触发 UITapGestureRecognizers

Question

我有一个主视图和主视图的 4 个 subview ，它们都有自己的 UITapGestureRecognizer，当我点击一个 subview 时，如何触发两个 View 。下面的例子，

如果我点击 subview 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")
}

它只打印被点击的 subview !是否有可能同时触发两个 gestureRecognizers，因为 main 正在封装其他。

Answer 1

首先你应该在你的VC中符合UIGestureRecognizerDelegate，然后实现shouldRecognizeSimultaneouslyWith的委托(delegate)函数。在函数内部，你应该检测 gestureRecognizer 和 otherGestureRecognizer 是否是你想要的，如果是，你应该让它们同时工作，

• 符合委托(delegate)，并在 viewDidLoad 之外声明手势识别器(因为稍后您需要在委托(delegate)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 设置为它们的委托(delegate):

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

• 实现上面提到的delegate函数，实现subView和mainView的同时识别:

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

如果您希望它适用于 4 个不同的 subview ，那么您应该检查委托(delegate)方法中的 else if 语句。