在可可应用程序中关闭文档时崩溃

Question

I have a document based cocoa app where each document is a web view.

Sometime when I close a document it crashes. Running Zombies it says An Objective-C message was sent to a deallocated 'MyDocument' object (zombie) when the crash happens.

It says the responsible caller is -[NSDocumentController makeUntitledDocumentOfType:error:] .

I don't understand why this method would be getting called after I close a document.

Answer 1

I finally found the solution after some help using a technical support incident with Apple.

I had to nil out the ui delegate in my -dealloc. Everything works fine now.

- (void)dealloc
{
    [self.webView setUIDelegate:nil];
}

The engineer told me for compatibility reasons even when using ARC most objects still have to use __unsafe_unretained references for their delegates instead of __weak .