Autoresizingmask, viewWillTransitionToSize and rotation - ios

Question

I have parentViewController and it contains Container with customViewController with autoresizing masks (flexible width and height). Container's width is ~80% of parentViewController view.
When I rotate device viewWillTransitionToSize:withTransitionCoordinator: is called but with "wrong" size. I get parentsViewController view size.
Here is part of customViewController
-(void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator
{
NSLog(#"viewWillTransitionToSize %#", NSStringFromCGSize(size));
[super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];
[self resizeViewToWidth:size.width];
[self performSelector:#selector(didRotate) withObject:nil afterDelay:1.0];
}
-(void)didRotate
{
NSLog(#"didRotate %#", NSStringFromCGSize(self.view.frame.size));
}
//it creates this log
//viewWillTransitionToSize {667, 331}
//didRotate {617, 311} //this is correct size after applying autoresizing masks
Why is it called only once when I see at least two different sizes?
I don't want to calculate view size if autoresizing masks can do it for me.
How do I let apply autoresizing masks first and then get size after applying?
What is correct way of using viewWillTransitionToSize while using autoresizing masks?

Answer 1

I solved it following way. It is actually overriding autoresizing mask but I couldn't find better solution and this fits my requirements.
I use method sizeForChildContentContainer:withParentContainerSize: of UIContentContainer. In method I check for child container and apply changes same as autoresizing would do by itself. magicNumber is abbreviation for custom calculation.
-(CGSize)sizeForChildContentContainer:(id<UIContentContainer>)container withParentContainerSize:(CGSize)parentSize
{
if ([container isKindOfClass:[customViewController class]])
{
return CGSizeMake(parentSize.width - magicNumber, parentSize.height);
}
return [super sizeForChildContentContainer:container withParentContainerSize:parentSize];
}