NSWindow 尝试关闭时显示警报
当 NSWindow 尝试关闭时如何显示 NSAlert？这也必须打开和关闭。
How can I display an NSAlert when an NSWindow attempts to close? This will also have to be turned on and off.
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NSWindow 的委托有一个 windowShouldClose: 方法将允许您自定义此方法。还有 NSWindow 的 documentEdited 方法，可以让您将文档标记为具有未保存的更改，您可能对此感兴趣。
NSWindow's delegate has a windowShouldClose: method that will allow you to customize this. There's also NSWindow's documentEdited methods that let you mark a document as having unsaved changes, which might interest you.