如何检测从长按开始的水龙头？

Posted 2023-02-27

【中文标题】如何检测从长按开始的水龙头？

【英文标题】：How to detect tap begin with Long press?

【发布时间】：2019-07-22 23:40:41

【问题描述】：

我想检测 3 个动作，“点击开始”、“长按开始”、“长按结束”。我想检测“点击开始”，无论检测长按（即每次触摸屏幕时，检测“点击开始”）并检测“点击开始”，然后检测“长按开始”以防继续触摸。

以下代码仅在未检测到“长按”的情况下才可以检测“轻按开始”。

    let longPressGesture = UILongPressGestureRecognizer(target: self, action: #selector(self.Long(_:)))
    longPressGesture.minimumPressDuration = 3  
    longPressGesture.allowableMovement = 30    

    let shortPressGesture = UITapGestureRecognizer(target: self, action: #selector(self.Tap(_:)))

    touchView.addGestureRecognizer(shortPressGesture)
    touchView.addGestureRecognizer(longPressGesture)



@objc func Long(_ sender: UILongPressGestureRecognizer) 
    if(sender.state == UIGestureRecognizer.State.began) 
    print("Long tap begin")
     else if (sender.state == UIGestureRecognizer.State.ended) 
    print("Long tap ended")
    


@objc func Tap(_ sender: UITapGestureRecognizer) 
    print("Tap begin")

【问题讨论】：

你不能在新闻发布时启动计时器并在发布时评估它吗？

【参考方案1】：

你需要符合UIGestureRecognizerDelegate

class ViewController: UIViewController, UIGestureRecognizerDelegate

然后实现shouldRecognizeSimultaneouslyWith函数，让你的两个手势识别器同时工作。

另外，我认为您实际上想要使用两个 UILongPressGesutureRecognizer，因为在触摸时会检测到点击。

  @objc func Long(_ sender: UILongPressGestureRecognizer) 
    if(sender.state == UIGestureRecognizer.State.began) 
      print("Long tap begin")
     else if (sender.state == UIGestureRecognizer.State.ended) 
      print("Long tap ended")
    
  

  @objc func Tap(_ sender: UILongPressGestureRecognizer) 
    if(sender.state == UIGestureRecognizer.State.began) 
      print("Tap begin")
     else if (sender.state == UIGestureRecognizer.State.ended) 
      print("Tap ended")
    
  

  func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool 
    if gestureRecognizer == longPressGesture && otherGestureRecognizer == shortPressGesture 
      return true
    
    return false
  

最后别忘了将手势识别器的代表设置为self

tapPressGesture.delegate = self
shortPressGesture.delegate = self