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The effect I'm trying to achieve is a kind of sticky header cell. It's important to me that the sticky cell floats over the top of the others. Something a bit like this: ┌──────────┐ │ │ │ Cell 0 │ │ ├┐ └┬─────────┘│ │ Cell 4 │ │ │ └──────────┘ ┌──────────┐ │ │ │ Cell 5 │ │ │ └──────────┘ ┌──────────┐ │ │ │ Cell 6 │ │ │ └──────────┘Cell 4, 5 and 6 would normally viewable and I'm constructing the attributes for Cell 0 in my UICollectionViewFlowLayout subclass during layoutAttributesForElementsInRect:. All I do is call the super implementation, determine which cell I need to add in and then construct the UICollectionViewLayoutAttributes(forCellWithIndexPath:). I then set the zIndex for it to 1 (default is 0).The problem I'm getting is that the UICollectionView seems to always ignore the zIndex ┌──────────┐ │ │ │ Cell 0 │ │┌─────────┴┐ └┤ │ │ Cell 4 │ │ │ └──────────┘ ┌──────────┐ │ │ │ Cell 5 │ │ │ └──────────┘ ┌──────────┐ │ │ │ Cell 6 │ │ │ └──────────┘Now I believe it's possible to visually sort this out using a 3d transform, but that doesn't work for me as I don't want any taps going to the cell which is over the top. So in this example I don't want Cell 4 receiving taps intended for Cell 0.Does anyone have any ideas? This is on iOS 8.4.