Can you access application delegate from within a UITableViewDataSource function?

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The Application is a singleton which maintains a reference to the app delegate. You can always access your app delegate using:

[UIApplication sharedApplication].delegate

You may need to cast the return to your own app delegate class to get rid of warnings. Even better, write an accessor that returns your upcast app delegate:

#pragma mark access to app delegate etc.
+ (MyAppDelegateClass*) sharedAppDelegate; {
    return (MyAppDelegateClass*)[[UIApplication sharedApplication] delegate];
}

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