Slightly confused with coordinates - objective-c

Question

Hi I have such code:
- (void)viewDidLoad
{
[super viewDidLoad];
// Get view bounds
CGRect bounds = [self.view bounds];
// Get center point
CGPoint center;
center.x = bounds.origin.x + bounds.size.width/2.0;
center.y = bounds.origin.y + bounds.size.height/2.0;
NSLog(#"center y = %f", center.y);
}
The above log initially prints 274.0
Then I have this method:
- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)x
duration:(NSTimeInterval)duration
{
CGRect bounds = [[self view] bounds];
// Get center point
CGPoint center;
center.x = bounds.origin.x + bounds.size.width/2.0;
center.y = bounds.origin.y + bounds.size.height/2.0;
// If the orientation is rotating to Portrait mode...
if (UIInterfaceOrientationIsPortrait(x))
{
NSLog(#"In rotation, center y = %f", center.y);
}
}
This center.y in above method is calculated in the same way as the one in viewDidLoad as you might notice. However, when phone is rotated first to landscape then back to portrait as initially, now the center.y in the above method always prints 230 (instead of 274.0 as initially) -- why?
What can be causing this?

Answer 1

- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation{
CGRect bounds = [[self view] bounds];
CGPoint center;
center.x = bounds.origin.x + bounds.size.width/2.0;
center.y = bounds.origin.y + bounds.size.height/2.0;
if (UIInterfaceOrientationIsLandscape(fromInterfaceOrientation)){
NSLog(#"In rotation, center y = %f", center.y);
}
}