在 minimumPressDuration 之前调用 NSPressGestureRecognizer

Posted 2023-02-27

【中文标题】在 minimumPressDuration 之前调用 NSPressGestureRecognizer

【英文标题】：NSPressGestureRecognizer called before minimumPressDuration

【发布时间】：2016-09-07 12:40:30

【问题描述】：

我需要我的NSButton 来响应常规点击以及长按。我像这样添加NSPressGestureRecognizer：

override func viewDidLoad() 
    super.viewDidLoad()

    let gr = NSPressGestureRecognizer()
    gr.minimumPressDuration = 1
    gr.action = #selector(handleLongPress)
    button.addGestureRecognizer(gr)  


func handleLongPress(gr: NSPressGestureRecognizer) 

    if gr.state == .Began 
        Swift.print("long press")
    

不幸的是，handleLongPress 即使在短时间单击或双击时也会随机触发。即使我将minimumPressDuration 设置为更高的值，它也会发生。

我尝试过使用shouldBeRequiredToFailByGestureRecognizer，但并没有解决问题。

我的代码有什么遗漏吗？

【问题讨论】：

当state == .Began，按下手势开始。当state == .Ended 时，按下手势已被识别。将if gr.state == .Began 更改为if gr.state == .Ended。阅读documentation。

【参考方案1】：

我已经通过处理多个手势识别器解决了这个问题：

类必须实现NSGestureRecognizerDelegate

var singleClick:NSClickGestureRecognizer?
var longClick:NSPressGestureRecognizer?

override func viewDidLoad() 
    super.viewDidLoad()

    longClick = NSPressGestureRecognizer()
    longClick!.minimumPressDuration = 1
    longClick!.action = #selector(handleGestureLong)
    longClick!.delegate = self

    singleClick = NSClickGestureRecognizer()
    singleClick?.numberOfClicksRequired = 1
    singleClick!.action = #selector(handleGestureSingle)
    singleClick!.delegate = self

    btn.addGestureRecognizer(longClick!)
    btn.addGestureRecognizer(singleClick!)



func gestureRecognizer(gestureRecognizer: NSGestureRecognizer, shouldRequireFailureOfGestureRecognizer otherGestureRecognizer: NSGestureRecognizer) -> Bool 
    if gestureRecognizer == singleClick && otherGestureRecognizer == longClick 
        return false
    
    return true


func handleGestureSingle(gr: NSClickGestureRecognizer) 

    switch gr.state 

    case .Ended:
        print("single click")
        break
    default:
        break

    


func handleGestureLong(gr: NSPressGestureRecognizer) 

    switch gr.state 

    case .Began:
        print("long click")
        break
    default:
        break