Incorrect size returned from systemLayoutSizeFittingSize: for UICollectionViewCells in iOS 7

Originator:danielctull
Number:rdar://18303829 Date Originated:11-Sep-2014 11:44 AM
Status:Open Resolved:
Product:iOS SDK Product Version:Xcode 6 GM
Classification:Serious Bug Reproducible:Always
 
Summary:
Calling systemLayoutSizeFittingSize on a UICollectionViewCell that has layout constraints that define a valid height returns 0 for the height. The same layout works fine for regular UIViews and also works fine in iOS 8.

Steps to Reproduce:
See sample code. A cell is loaded from a nib. The cell has a fixed height defined with a layout constraint. systemLayoutSizeFittingSize is called on the cell.

Expected Results:
Run the sample app on an iOS 7 device or simulator and the call to the cell’s systemLayoutSizeFittingSize method should return a height of 100

Actual Results:
The call to systemLayoutSizeFittingSize returns a height of 0.

**Regression**:
I filed rdar://18047251 original where this bug occurred on iOS 8 devices and simulators, but was fine (and always worked on past versions of Xcode) on iOS 7 devices and simulators.

Even on Xcode 6 beta 7, this call worked on iOS 7. Now it fails.

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