Re: Put UICollectionView within UITableViewCell
Re: Put UICollectionView within UITableViewCell
- Subject: Re: Put UICollectionView within UITableViewCell
- From: Glen Huang <email@hidden>
- Date: Sat, 10 Mar 2018 00:33:05 +0800
@Cosmo
My collection items contain label, so I don’t know the exact sizes before hand.
@Gary
In my case I actually also need to display section headers and section index
titles, so using just a collection view probably won’t be easy I guess.
—
From the suggestions it seems it might be something very difficult to pull off.
I wonder if anyone ever reverse-engineered multiline UILabels to see how table
cells can have correct heights containing them.
> On 10 Mar 2018, at 12:14 AM, Cosmo Birch <email@hidden> wrote:
>
> Where I work we have spent a fair amount of trying unsuccessfully to get
> self-sizing collection view cells to work as described by Apple documentation
> with UICollectionViews that have any sort of complexity. I would suggest
> trying to implement the sizeForItemAtIndexPath delegate method to see if that
> solves your problem. Sorry if the name of the method is slightly off. I can’t
> look it up at the moment.
>
>> On Mar 9, 2018, at 8:00 AM, Glen Huang <email@hidden> wrote:
>>
>> Hi,
>>
>> I asked a question about putting UICollectionView within UITableViewCell on
>> Apple Developer Forums (https://forums.developer.apple.com/thread/98176),
>> but it doesn’t get many replies. I’m not sure if it’s ok to repost the
>> question here. I apologize if it’s not.
>>
>> Here is the question:
>>
>> Hi, I'm trying to create a table view with cell content like this
>>
>> | Label |
>> | CollectionItem 1 CollectionItem 2 CollectionItem 3 |
>> | CollectionItem 4 |
>>
>> Collection view item should auto wrap at cell end, both the collection view
>> and table view use automatic height.
>>
>> I can somewhat achieve this effect by doing:
>> put the label and the collection view in a vertical stack view, make the
>> stack view's each edge touch table cell's corresponding edge.
>> disable collection view scrolling.
>> collection view's intrinsicContentSize returns layout's
>> collectionViewContentSize value.
>> in table cell's prepareForReuse method, I make the collection view reload
>> its data.
>>
>> But the problem comes when each table cell can contain different number of
>> collection items: some table view cells have incorrect heights, clipping its
>> collection view. My guess is that when table cells get reused, they don't
>> take collection view's new intrinsicContentSize into account.
>>
>> I tried calling sizeToFit/layoutIfNeeded/updateConstraints in cell's
>> prepareForReuse method, none of them works.
>>
>> If I replace the collection view with a multiline label, and make each cell
>> contain different length of text, the cells all have correct heights.
>>
>> I wonder why label are able to correctly resize cells? how can I make
>> collection views do the same?
>>
>
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