Detecting iOS 8 Orientation change in UIView

Question

I am detecting Regular and Compact size classes with TraitCollectionDidChange in iOS8.

I am trying to fit a particular set of data horizontally across the screen and it does not fit in Horizontal Class Regular on a Portrait iPad Mini however there would be plenty of space in Landscape.

The problem is that Horizontal SizeClass is Regular in Portrait and Landscape so the TraitCollectionDidChange does not fire and I don't get told about the Orientation change.

I have heard reference to viewWillTransitionToSize but that is not available in a UIView.

Are Apple saying they do not want UI layout diffs from Horizontal Class Regular - Portrait and Horizontal Class Regular - Landscape?

If it's OK to do it how do I get told, in a UIView, about the Orientation change?

Answer 1

Just add the method -(void) layoutSubviews into your UIView subclass. It will get called any time the view's dimensions change. Don't forget to call [super layoutSubviews] inside your new method.

Then you can check self.traitCollection.verticalSizeClass and self.traitCollection.horizontalSizeClass to see what you're looking at.

-(void) layoutSubviews
{
    [super layoutSubviews];

    //   your code here...
}