“viewWillTransitionToSize:” not called in iOS 9 when the view controller is presented modally

Question

I present a view controller from another one:

- (void)showModalView
{
   UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@\"Main\" bundle:nil];
          


        

Answer 1

Maybe it's a little late, but I put this here for anyone stumbling upon this frustrating issue.

Keep in mind that viewWillTransitionToSize:withTransitionCoordinator: sometimes gets called on the presentingViewController of the view controller you are expecting it to. (And if that view controller has a presentingViewController too, it may get called on that)

I couldn't really figure out the logic behind this, but that was the point in my case. So I had to override viewWillTransitionToSize:withTransitionCoordinator: in many of my view controllers like this:

- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id)coordinator {
    [super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];

    [self.presentedViewController viewWillTransitionToSize:size withTransitionCoordinator:coordinator];
}