cocoa touch - How do I detect a rotation on the iPhone without the device autorotating?

Question

Anyone know how to do this?

I thought this:

-(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    return YES;
}

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
}

- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation duration:(NSTimeInterval)duration {
}

- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation {
}

- (void)willAnimateFirstHalfOfRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
}

- (void)didAnimateFirstHalfOfRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation {
}

- (void)willAnimateSecondHalfOfRotationFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation duration:(NSTimeInterval)duration {
}

may prevent the device from rotation (overriding all rotate methods of my UIViewController and not calling the superclass) but I fear it's not the UIViewController that actually performs the rotation.

My UIViewController is in a UINavigationController.

Anyone have any ideas?

Cheers, Nick.

Answer 1

You can register for the notification UIDeviceOrientationDidChangeNotification (from UIDevice.h), and then when you care about orientation changes call this method:

[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];

When you no longer care about orientation changes, call this method:

[[UIDevice currentDevice] endGeneratingDeviceOrientationNotifications];

The notification will be sent when applicable, and you can check [UIDevice currentDevice].orientation to find out what the current orientation is.