如何禁用“手势识别器”（XMCircleGestureRecognizer）？

Posted 2023-03-13

【中文标题】如何禁用“手势识别器”（XMCircleGestureRecognizer）？

【英文标题】：How to disable a "gesture recognizer" (XMCircleGestureRecognizer)?

【发布时间】：2017-07-13 14:02:43

【问题描述】：

对于我正在构建的应用程序，我使用this class，并且，当我在不使用苹果手势识别器的情况下识别其他手势时，例如点击、滑动或长按（我自己构建了这些来自 Apple 的准确）我希望能够禁用 XMCircleGestureRecognizer，并在需要时启用它。

问题是当我在某些情况下调用它时，即使我将手指从屏幕上抬起，再次触摸屏幕，它仍然在 XMCircleGestureRecognizer 中，并且永远不会离开它。我必须终止应用并重新启动它。

我不确定是否有必要提供我的一些代码，但如果需要，请告诉我（它有 600 行长，所以很难只得到你需要的部分）。

你知道我该怎么做吗？ 因为我完全坚持这一点。

非常感谢您的帮助！

编辑：

import UIKit

class ViewController: UIViewController 
var gesture: XMCircleGestureRecognizer?


override func viewDidLoad() 
    super.viewDidLoad()
    ascending = false


override func didReceiveMemoryWarning() 
    super.didReceiveMemoryWarning()


override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) 
    gesture?.isEnabled = false
    super.touchesBegan(touches, with: event)
    for touch in touches
        let point = touch.location(in: self.view)
        for (index,finger)  in fingers.enumerated() 
            if finger == nil 
                fingers[index] = String(format: "%p", touch)

                if (finger1.isEmpty)
                    finger1 = [point.x, point.y]
                 else if (finger2.isEmpty)
                    finger2 = [point.x, point.y]
                 else if (finger3.isEmpty)
                    finger3 = [point.x, point.y]
                 else if (finger4.isEmpty)
                    finger4 = [point.x, point.y]
                 else if (finger5.isEmpty)
                    finger5 = [point.x, point.y]
                
                break
            
        
    

    timer = Timer.scheduledTimer(timeInterval: 0.3, target: self, selector: #selector(increaseValue), userInfo: nil, repeats: true)
    if ascending 
        ascending = false
    
    else 
        ascending = true
    


override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) 
    super.touchesMoved(touches, with: event)

    for touch in touches 
        let point = touch.location(in: self.view)
        for (index,finger) in fingers.enumerated() 
            if let finger = finger, finger == String(format: "%p", touch) 
                switch (index)
                case 0 :
                    finger1 += [point.x, point.y]
                case 1 :
                    finger2 += [point.x, point.y]
                case 2 :
                    finger3 += [point.x, point.y]
                case 3 :
                    finger4 += [point.x, point.y]
                case 4 :
                    finger5 += [point.x, point.y]
                default :
                    break
                
            
        
    


override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) 
    super.touchesEnded(touches, with: event)
    endTime = getCurrentMillis()
    gesture?.isEnabled = false

    for touch in touches 
        for (index,finger) in fingers.enumerated() 
            if let finger = finger, finger == String(format: "%p", touch) 
                fingers[index] = nil
                break
            
        
    

    direction[0] = ""
    direction[1] = ""
    direction[2] = ""
    direction[3] = ""
    direction[4] = ""

    if finger1.count != 0 
        direction[0] = GestureRecognizer(coordinates: finger1, index: 0)
    
    if finger2.count != 0 
        direction[1] = GestureRecognizer(coordinates: finger2, index: 1)
    
    if finger3.count != 0 
        direction[2] = GestureRecognizer(coordinates: finger3, index: 2)
    
    if finger4.count != 0 
        direction[3] = GestureRecognizer(coordinates: finger4, index: 3)
    
    if finger5.count != 0 
        direction[4] = GestureRecognizer(coordinates: finger5, index: 4)
    

if Int64(endTime - startTime) < 400 
// HERE I TEST MY GESTURES



func increaseValue() -> Int 
// HERE I TEST FOR LONG PRESS
else if !finger1.isEmpty && abs(finger1[finger1.count - 2] - finger1[0]) >= 40 && abs(finger1[1] - finger1[finger1.count - 1]) >= 40 

        gesture = XMCircleGestureRecognizer(midPoint: self.view.center, target: self, action: #selector(ViewController.rotateGesture(recognizer:)))
        self.view.addGestureRecognizer(gesture!)

    
    return value


func rotateGesture(recognizer:XMCircleGestureRecognizer)

    StatusLabel.text = ""

    if let rotation = recognizer.rotation 
        currentValue += rotation.degrees / 360 * 100
        StatusLabel.text = StatusLabel.text! + String(format:"Value: %.2f%%", currentValue)
    

    if let angle = recognizer.angle 
        StatusLabel.text = StatusLabel.text! + "\n" + String(format:"Angle: %.2f%", angle.degrees)
    

    if let distance = recognizer.distance 
        StatusLabel.text = StatusLabel.text! + "\n" + String(format:"Distance: %.0f%", distance)
    

【参考方案1】：

这对我有用：

    let gesture = XMCircleGestureRecognizer(midPoint: self.view.center, target: self, action: #selector(ViewController.rotateGesture(recognizer:)))
    self.view.addGestureRecognizer(gesture)        
    gesture.isEnabled = true //or false

【讨论】：

那是最简单的方法，但是你在哪里声明了手势？在 viewDidLoad 中？因为我不能在 touchesEnded() 等另一个函数中执行 .isEnable 方法

您可以将属性“gesture”设为全局并在代码的任何部分使用。

好的，看起来可以。但问题不是我想的那个。在我的视图控制器中，我创建了 XMCircleGestureRecognizer，这没问题。但是当 touchesEnded 发生时，什么也没有发生，它永远不会离开并返回到 viewController，所以我不能禁用它。你能帮忙出个主意吗？善良:)

你能给我更多的信息或有这个问题的示例应用吗？

刚刚用一些代码编辑了我的问题。如果您需要更多信息，请告诉我。我没有在 XMCircleGestureRecognizer 中进行任何修改。正如我告诉过你的，它卡在 XMCircleGestureRecognizer 的 overrode touchesEnded 中

【参考方案2】：

试试这个代码。基本上，它会循环遍历您添加到视图中的所有手势并一一移除。

if let gestureArr = theView.gestureRecognizers 
    for gesture in gestureArr 
        theView.removeGestureRecognizer(gesture)