可可应用程序：如何在不终止应用程序的情况下关闭窗口？

Question

I am working on a Cocoa app, using Swift. The app opens with a window and the user can open another window using the menu. The problem is that when either window is closed using the red button, the app terminates. I don't want that behavior; I want the app to remain alive. It's not crashing; the AppDelegate's applicationWillTerminate method executes.

The AppDelegate has the method applicationShouldTerminateAfterLastWindowClosed, which returns false, but this method never gets executed.

I am a reasonably competent Swift iOS developer; this is my first real Cocoa app and I suspect this is something simple, but I'm baffled right now. How do I close a window without terminating the app entirely?

Edit: Here are some code snippets:

In the AppDelegate:

func applicationShouldTerminateAfterLastWindowClosed(_ sender: NSApplication) -> Bool {
    Log.methodEnter()
    return false
}

Also in the AppDelegate, the method to open a window:

@IBAction func openVerbSettingsWindow(sender: NSMenuItem) {
    verbSettingsWindowController.showWindow (nil)

}

From the windowViewController, the only method that does anything as the window loads and displays:

override func windowDidLoad() {
    super.windowDidLoad()
    window?.setFrame(NSMakeRect(400.0, 100.0, 950.0, 450.0), display: true)
}

I'm hopeful this helps!

Answer 1

I'm not a little embarrassed at the answer to this question; it has nothing to do with Cocoa or my code.

I have an app called RedQuits that configures OS X to close an app when that app's last window closes, rather than leaving the app running with no windows (OS X default behavior). When I got rid of RedQuits and re-booted so that OS X would return to its default behavior, the problem went away. For some reason, RedQuits causes my Cocoa app to quit when any application window closes. Interestingly, I found this because it causes the same behavior in Xcode: close one project window and Xcode shut down.