如何检测从长按开始的水龙头？答案

【问题标题】：How to detect tap begin with Long press?如何检测从长按开始的水龙头？
【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？

标签： ios swift uitapgesturerecognizer

【解决方案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

【讨论】：