Incorrect size returned from systemLayoutSizeFittingSize: for UICollectionViewCells in iOS 8

Originator:rowun
Number:rdar://18061720 Date Originated:19-Aug-2014 02:15 PM
Status:Open Resolved:
Product:Developer Tools Product Version:Xcode6-Beta5 (6A279r)
Classification:Serious Bug Reproducible:Always
 
This is a duplicate of rdar://18047251

This is a duplicate of rdar://17958382

Summary:
Calling systemLayoutSizeFittingSize on a UICollectionViewCell that has layout constraints that define a valid height returns 0 for the height. The same layout works work fine for regular UIViews and also works fine in iOS 7.

Steps to Reproduce:
Load a cell from a nib with constraints set to define the size of the cell. Notice that any call to systemLayoutSizeFittingSize: returns CGSizeZero.

Expected Results:
systemLayoutSizeFittingSize: should return a proper size.

Actual Results:
systemLayoutSizeFittingSize returns a height of 0.

Comments

workaround with systemLayoutSizeFittingSize:withHorizontalFittingPriority:verticalFittingPriority:

For what it's worth, you can currently work around this by calling systemLayoutSizeFittingSize:withHorizontalFittingPriority:verticalFittingPriority:

For instance: 

  CGSize constrainedSize;
  if ([self.sizingCommentCell respondsToSelector:@selector(systemLayoutSizeFittingSize:withHorizontalFittingPriority:verticalFittingPriority:)]) {
    constrainedSize = [self.sizingCommentCell systemLayoutSizeFittingSize:UILayoutFittingCompressedSize
                                            withHorizontalFittingPriority:UILayoutPriorityRequired
                                                  verticalFittingPriority:UILayoutPriorityDefaultLow];
  }
  else {
    constrainedSize = [self.sizingCommentCell systemLayoutSizeFittingSize:UILayoutFittingCompressedSize];
  }
By alexisgallagher at Aug. 20, 2014, 8 p.m. (reply...)

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