永远不会调用 MouseMoved 函数答案

【问题标题】：MouseMoved function is never called永远不会调用 MouseMoved 函数
【发布时间】：2020-11-27 22:41:50
【问题描述】：

我正在尝试覆盖 NSViewController 中的 mouseMoved 函数。

import Cocoa

class MainViewController: NSViewController {

override var acceptsFirstResponder: Bool {get {return true} }

@IBOutlet var background: RandomNumberBackground!
override func viewDidLoad() {
    super.viewDidLoad() 
}

override func awakeFromNib() {
    NSTimer.scheduledTimerWithTimeInterval(0.04, target: background, selector: "updateNumbers", userInfo: nil, repeats: true)
}

@IBAction func btnLevelClicked(sender: AnyObject) {
      self.presentViewControllerAsSheet(LevelScrollController())
}

override func mouseMoved(theEvent: NSEvent) {
    Swift.print("MOVED!")
}

}

我已经覆盖了acceptsFirstResponder，但从未调用过mouseMoved。为什么？我哪里错了？

【问题讨论】：

stackoverflow.com/a/31932049/2303865
你需要继承 NSWindow 并覆盖 mouseMoved 方法

标签： swift macos cocoa

【解决方案1】：

你需要在windows属性中设置acceptsMouseMovedEvents。

将以下代码添加到 applicationDidFinishLaunching

func applicationDidFinishLaunching(aNotification: NSNotification) {
    window.acceptsMouseMovedEvents = true
}

【讨论】：

【解决方案2】：

无需在窗口上设置任何东西。

跟踪区域是处理此问题的正确方法。

只需在 VC 的 viewWDidLoad() 方法中添加即可。

let ta = NSTrackingArea(rect: CGRect.zero, options: [.activeAlways, .inVisibleRect, .mouseMoved], owner: self, userInfo: nil)
self.view.addTrackingArea(ta)

【讨论】：

【解决方案3】：

这是我需要在视图中跟踪鼠标移动时添加的代码。它比以前的答案更长，但这是正确完成所需要的:)

class MyView: NSView {
    
    var trackingArea: NSTrackingArea?

    // MARK: - Tracking area management

    /// Will install tracking area on the view if a window is set
    override func viewDidMoveToSuperview() {
        super.viewDidMoveToSuperview()
        installTrackingArea()
    }
    
    /// Install tracking area if window is set, remove previous one if needed.
    func installTrackingArea() {
        guard let window = window else { return }
        window.acceptsMouseMovedEvents = true
        if trackingArea != nil { removeTrackingArea(trackingArea!) }
        let trackingOptions = [.activeAlways, .mouseEnteredAndExited, .mouseMoved]
        trackingArea = NSTrackingArea(rect: bounds, 
                                      options: trackingOptions, 
                                      owner: self, userInfo: nil)
        self.addTrackingArea(trackingArea!)
    }
    
    /// Called when layout is modified
    override func updateTrackingAreas() {
        super.updateTrackingAreas()
        installTrackingArea()
    }

    //MARK: - Mouse Events handling

    override func mouseExited(with event: NSEvent) {
        print("Good bye mouse")
    }
    
    override func mouseEntered(with event: NSEvent) {
        let point = self.convert(event.locationInWindow, from: nil)
        print("Hello mouse, welcome at \(point)")
    }

    override func mouseMoved(with event: NSEvent) {
        let point = self.convert(event.locationInWindow, from: nil)
        print("Mouse moved \(point)")
    }
}

【讨论】：

【解决方案4】：

您需要在视图所属的窗口上设置acceptsMouseMovedEvents 属性。看 https://developer.apple.com/library/mac/documentation/Cocoa/Reference/ApplicationKit/Classes/NSWindow_Class/index.html#//apple_ref/occ/instp/NSWindow/acceptsMouseMovedEvents

【讨论】：

【解决方案5】：

在 swift 3 中你可以把它放在你的 viewDidLoad() 中

self.view!.window?.acceptsMouseMovedEvents = true;

【讨论】：