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after all i find solution. first AppDelegate implement NSWindowDelegate then catch you main window in applicationDidFinishLaunching, then point mainWindow.delegate = self     func applicationDidFinishLaunching(_ notification: Notification) {         mainWindow = NSApp.windows[0]         mainWindow!.delegate = self         setUpMacMenu()     func windowShouldClose(_ sender: NSWindow) -> Bool {         NSApp.hide(nil)         return false     }     }```