Re: Put UICollectionView within UITableViewCell

[Glen Huang]

I’ll give it a shot, thank you very much

> On 10 Mar 2018, at 10:27 AM, Cosmo Birch  wrote:
> 
> But you presumably know the width (i.e. the CollectionView width minus any 
> insets), and you can calculate the height based on that with NSString or 
> NSAttributedString boundingRect functions. Assuming you have a subclass for 
> your CollectionViewCell, you can add a method to return your cell height 
> based on its contents layout.
> 
>> On Mar 9, 2018, at 8:21 AM, Gary L. Wade  
>> wrote:
>> 
>> @Cosmo
>> 
>> My collection items contain label, so I don’t know the exact sizes before 
>> hand.
>> 
> 
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Re: Put UICollectionView within UITableViewCell

[Cosmo Birch]

But you presumably know the width (i.e. the CollectionView width minus any 
insets), and you can calculate the height based on that with NSString or 
NSAttributedString boundingRect functions. Assuming you have a subclass for 
your CollectionViewCell, you can add a method to return your cell height based 
on its contents layout.

> On Mar 9, 2018, at 8:21 AM, Gary L. Wade  wrote:
> 
> @Cosmo
> 
> My collection items contain label, so I don’t know the exact sizes before 
> hand.
> 

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Re: Put UICollectionView within UITableViewCell

[Glen Huang]

@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  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  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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Re: Put UICollectionView within UITableViewCell

[Gary L. Wade]

I would suggest rethinking the table view enclosure and just use a collection 
view with headers and footers by way of the supplemental views.
--
Gary L. Wade
http://www.garywade.com/

> On Mar 9, 2018, at 8:00 AM, Glen Huang  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?
> 
> Thanks very much.
> 

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Re: Put UICollectionView within UITableViewCell

[Cosmo Birch]

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  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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Put UICollectionView within UITableViewCell

[Glen Huang]

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?
 
Thanks very much.
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