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Summary:
In the attached project, I have a UICollectionView whose cells have non-scrollable UITextView subviews. The UITextView is constrained using AutoLayout to its parent cell's edges using top, bottom, and leading space constraints. The UITextView also has a fix width constraint.

I am calculating the cell's size at runtime using the systemLayoutSizeFittingSize: method on a temporarily allocated cell, loaded from a nib in the bundle (the same nib that is registered with the UICollectionView). That size is then returned in the UICollectionView's flow layout delegate method: collectionView:layout:sizeForItemAtIndexPath:

This works in iOS 7, but not in iOS 8. In iOS 7 the systemLayoutSizeFittingSize: method returns a valid height for the temporary cell, but in iOS 8 it returns a height of 0.

Steps to Reproduce:
See description & attached project.

1. Create a UICollectionView and define its cells in a separate nib
2. Add a UITextView subview to the UICollectionViewCell nib
3. Add constraints in IB from the UITextView to its parent view for top, bottom, and leading spacing, and add a fixed width constraint to the UITextView
4. Calculate the cell's size at runtime using systemLayoutSizeFittingSize:



Expected Results:
Size returned by systemLayoutSizeFittingSize: should be non-zero (which is true in iOS 7 but not iOS 8)

Actual Results:
Size returned by systemLayoutSizeFittingSize: is zero in iOS 8

Version:
iOS 8