> 
> 2015-08-18 16:07:51.523 Example[16070:269647] the behavior of the
> UICollectionViewFlowLayout is not defined because: 2015-08-18
> 16:07:51.523  
> 
> Example[16070:269647] the item width must be less than
> the width of the UICollectionView minus the section insets left and
> right values, minus the content insets left and right values.  
> 
> 2015-08-18 16:07:51.524 Example[16070:269647] The relevant
> UICollectionViewFlowLayout instance is <UICollectionViewFlowLayout:
> 0x7f24d670>, and it is attached to <UICollectionView: 0x7b377200;
> frame = (0 0; 768 1024); clipsToBounds = YES; autoresize = W+H;
> gestureRecognizers = <NSArray: 0x7f24ce30>; animations = {
> position=<CABasicAnimation: 0x7f279d60>;
> bounds.origin=<CABasicAnimation: 0x7f279430>;
> bounds.size=<CABasicAnimation: 0x7f279480>; }; layer = <CALayer:
> 0x7aec9cf0>; contentOffset: {0, 0}; contentSize: {1024, 770}>
> collection view layout: <UICollectionViewFlowLayout: 0x7f24d670>.
> 2015-08-18 16:07:51.524 Example[16070:269647] Make a symbolic
> breakpoint at UICollectionViewFlowLayoutBreakForInvalidSizes to catch
> this in the debugger.
> 
> 
> 

That is what I get and what I do

```
func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {
        return CGSizeMake(self.collectionView!.frame.size.width - 20, 66)
    }

```

I rotate from landscape to portrait then the console shows this error message only in iOS 9 if anyone knows what happens and if there is a fix for this?

[![Screenshot](https://i.stack.imgur.com/QZKAX.png)](https://i.stack.imgur.com/QZKAX.png)