ChrisChouFreeManDev
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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
}
}```