方法一:

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var window: NSWindow!
func applicationShouldHandleReopen(_ sender: NSApplication, hasVisibleWindows flag: Bool) -> Bool {
     if !flag{
        let sb = NSStoryboard(name: "Main", bundle: nil)
        let controller = sb.instantiateInitialController() as!
        NSWindowController
        controller.window?.makeKeyAndOrderFront(self)
        window = controller.window
     }
   return true
}

方法二:

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var window: NSWindow!
    
func applicationDidFinishLaunching(_ aNotification: Notification) {
    window = NSApplication.shared.windows[0]
}
func applicationShouldHandleReopen(_ sender: NSApplication, hasVisibleWindows flag: Bool) -> Bool {
	if !flag{
		window.makeKeyAndOrderFront(nil)
	}
	return true
}

方法三:

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func applicationShouldHandleReopen(_ sender: NSApplication, hasVisibleWindows flag: Bool) -> Bool {
		if !flag{
				for window in sender.windows{
					if let w = window as? NSWindow{
					w.makeKeyAndOrderFront(self)
				}
			}
		}
	return true
}