Re: UICollectionView not obeying zIndex of UICollectionViewLayoutAttributes
Re: UICollectionView not obeying zIndex of UICollectionViewLayoutAttributes
- Subject: Re: UICollectionView not obeying zIndex of UICollectionViewLayoutAttributes
- From: Ted Bradley <email@hidden>
- Date: Fri, 07 Aug 2015 12:14:40 +0100
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@hidden> wrote:
>
> Can you post your implementations -layoutAttributesForElementsInRect: as well as -layoutAttributesForItemAtIndexPath:?
>
> Luke
>
>> On Aug 6, 2015, at 8:09 AM, Ted Bradley <email@hidden> 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.
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