問題描述
保存 NSDocument 時收到通知 (Get notified when NSDocument is saved)
How can I get notified when NSDocument is saved, the first time and subsequent times?
I first thought that overriding writeToURL:ofType:error: would do it, but it appears that this method is also called for temporary autosaves before the document is saved for the first time, and maybe on copy/duplicate operations.
On the other hand, setFileURL: appears to be called the first time that the document is saved but not on subsequent times.
Is there some kind of Save notification? Or do I have to work around the various border cases of the above methods?
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參考解法
方法 1:
NSDocument has writeSafelyToURL::::, which in addition to the target location URL also gets a NSSaveOperationType passed in. This would allow you to filter out autosave operations.
Don't forget to call the super implementation when overriding writeSafelyToURL.
(by hpique、Thomas Zoechling)