close event NSWindow

I have an application, where a second NSWindow is opened by pressing a button. This new window is opened using [NSApp runModalForWindow:<myWindow&开发者_如何学JAVAgt;]. I want to be able to determine if the user closes the second window, in order to stop the modal.

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There are several ways to be notified when a window closes.

• You can observe NSWindowWillCloseNotification notifications from the second NSWindow object.
• You can implement NSWindowDelegate methods windowShouldClose: or windowWillClose:.
• You can subclass NSWindow and override the performClose: method.
• You can add a Close button to the window, and connect it to an action.

Without more information, it's hard to advise which of these or other options would work best for you.