How to get notified when the status bar height changes?

Does the OS send notif开发者_高级运维ications when the status bar height changes? For example that fat in-call status bar?

Yes. Your app delegate can implement these methods:

• -application:willChangeStatusBarFrame:
• -application:didChangeStatusBarFrame:

and these local notifications will also be sent to the default notification center:

• UIApplicationWillChangeStatusBarFrameNotification
• UIApplicationDidChangeStatusBarFrameNotification