swift - NSView 的 mouseMoved 永远不会被调用

Question

我发现 mouseDown 被调用，但没有 mouseMoved。怎么才能调用mouseMoved呢？这是我的代码:

@available(OSX 10.10, *)
class MainView: NSView{
  override var acceptsFirstResponder: Bool { return true }

  override func draw(_ dirtyRect: NSRect){
    titledString.draw(at:NSPoint(x:20,y:40))
  }
  override func mouseDown(with event: NSEvent){
    //print("Mouse down")
    printMouseDown()
  }
  override func mouseMoved(with event: NSEvent){
    //print("Mouse down")
    super.mouseMoved(with:event)
    printMouseMove()
  }
}

这是什么？我怎样才能修改代码

附: 这是驱动程序代码:

@available(OSX 10.10, *)
class AppDelegate: NSObject, NSApplicationDelegate {
  let window = NSWindow()
  func applicationDidFinishLaunching(_ notification: Notification){
    window.setContentSize(NSSize(width:200, height:160))
    window.styleMask = [.titled, .closable, .miniaturizable]
    window.level = 1
    window.title = "Test"
    window.acceptsMouseMovedEvents = true
    window.contentView = MainView()
    window.center()
    window.makeKeyAndOrderFront(window)
  }
}

if #available(OSX 10.10, *){
  let app = NSApplication.shared()
  let appDelegate = AppDelegate()
  app.delegate = appDelegate
  app.run()
}

Answer 1

您必须设置委托(delegate):

view.acceptsMouseMovedEvents = YES;