what method will called when we start to rotate device and after it finished

Question

i want to detect a rotation process on ipad programmatically. In this case i want to set a boolean into yes, when the rotation will begin, and set it false after the rotation did ending. Is there any method that called when the rotation will begin and the rotation did ending?

Answer 1

From Apple Docs:

Sent to the view controller just before the user interface begins rotating.

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

Sent to the view controller after the user interface rotates:

- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation 

See more here: UIViewController Class Reference -> Responding to View Rotation Events

ATTENTION: This is deprecated, see this post

Answer 2

For newcomers to this post, the methods suggested by Nekto have become deprecated in iOS 8. Apple suggests to use:

-(void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator 

You can use the "size" parameter as an easy way to get whether it is transitioning to portrait or landscape.

i.e.

if (size.width > size.height) {     // Position elements for Landscape } else {     // Position elements for Portrait } 

More info is availablein the Docs.