我有一个NSView的子类，它包含以下NSTrackingArea代码。但由于某种原因，鼠标事件不会在Playground中触发。
正在调用viewWillMoveToWindow，但似乎没有其他事情可以解决。有没有人知道遗失的是什么？
class MyView: NSView {
private var trackingArea: NSTrackingArea = NSTrackingArea()
// Other stuff omitted here...
// ...
override func viewWillMoveToWindow(newWindow: NSWindow?) {
// Setup a new tracking area when the view is added to the window.
trackingArea = NSTrackingArea(rect: self.bounds, options: [.MouseEnteredAndExited, .ActiveAlways], owner: self, userInfo: nil)
self.addTrackingArea(trackingArea)
}
override func updateTrackingAreas() {
self.removeTrackingArea(trackingArea)
trackingArea = NSTrackingArea(rect: self.bounds, options: [.MouseEnteredAndExited, .ActiveAlways], owner: self, userInfo: nil)
self.addTrackingArea(trackingArea)
}
// Mouse events
override func mouseEntered(theEvent: NSEvent) {
NSLog("MouseEntered")
}
override func mouseExited(theEvent: NSEvent) {
NSLog("MouseExited")
}
override func mouseDown(theEvent: NSEvent) {
NSLog("MouseDown")
}
}