CALayers didn't get resized on its UIView's bounds change. Why?

Question

I have a UIView which has about 8 different CALayer sublayers added to its layer. If I modify the view's bounds (animated), then the view itself gets shrinked (I checked it with a backgroundColor), but the sublayers' size remains unchanged.

How to solve this? I've just started googleing but haven't found any useful. Thanks in advance.

Answer 1

Since CALayer on the iPhone does not support layout managers, I think you have to make your view's main layer a custom CALayer subclass in which you override layoutSublayers to set the frames of all sublayers. You must also override your view's +layerClass method to return the class of your new CALayer subclass.

Answer 2

I had the same problem. In a custom view's layer I added two more sublayers. In order to resize the sublayers (every time the custom view's boundaries change), I implemented the method "layoutSubview" of my custom view; inside this method i just update each sublayer's frame to match the current boundaries of my subview's layer. Something like this:

-(void)layoutSubview{
   //keep the same origin, just update the width and height
   if(sublayer1!=nil){
      sublayer1.frame = self.layer.bounds;
   }

}