Thanks for the reply. I made a standalone project in order to strip out all my extraneous code. In the process I think I found my own solution.
override func initialLayoutAttributesForAppearingItemAtIndexPath(itemIndexPath: NSIndexPath) -> UICollectionViewLayoutAttributes? override func finalLayoutAttributesForDisappearingItemAtIndexPath(itemIndexPath: NSIndexPath) -> UICollectionViewLayoutAttributes? were not also applying the new zIndex so I think this was what was causing it. Just thought I should post back the solution in case this comes up in a search for anyone else. Thanks again, Ted > On 6 Aug 2015, at 16:42, Luke Hiesterman <[email protected]> wrote: > > Can you post your implementations -layoutAttributesForElementsInRect: as well > as -layoutAttributesForItemAtIndexPath:? > > Luke > >> On Aug 6, 2015, at 8:09 AM, Ted Bradley <[email protected]> wrote: >> >> 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. >> _______________________________________________ >> >> Cocoa-dev mailing list ([email protected]) >> >> Please do not post admin requests or moderator comments to the list. >> Contact the moderators at cocoa-dev-admins(at)lists.apple.com >> >> Help/Unsubscribe/Update your Subscription: >> https://lists.apple.com/mailman/options/cocoa-dev/luketheh%40apple.com >> >> This email sent to [email protected] > _______________________________________________ Cocoa-dev mailing list ([email protected]) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [email protected]
