попробуйте
- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation
{
float x = yourView.bounds.origin.x;
float y = yourView.bounds.origin.y;
float width = yourView.bounds.size.width;
float height = yourView.bounds.size.height;
NSLog(@"x=%f,y=%f,w=%f,h=%f",x,y,width,height);
}