The main issue is that the cell doesn’t (and shouldn’t) have any idea about
what size the collectionView is. You could actually use the delegate though
(which has a wider view) and provide the size that way.
That said, I did additional research and found other people with your issue.
Relevant posts:
https://github.com/imyoungyang/DynamicHeight
http://stackoverflow.com/questions/25895311/uicollectionview-self-sizing-cells-with-auto-layout
My recommendation would be to remove the preferredAttributes stuff, and give
your cell’s content view an explicit width constraint. Then in the
collectionView:layout:sizeForItemAtIndexPath: method of your
FlowLayoutDelegate, set the constant of the width constraint to the desired
width (you are passed the collectionView). Then return the result of
contentView.systemLayoutSizeFittingSize(UILayoutFittingCompressedSize). Note:
I haven’t actually tried this… all code written in mail.
Thanks,
Jon
> On Aug 10, 2016, at 2:27 PM, Doug Hill <[email protected]> wrote:
>
> Jonathon,
>
> Thanks for the feedback.
>
> A question that comes to mind is, what about making cells the same size as
> the collection view requires going through subclassing the collection view
> layout? Apple documentation IMPLIES this should work. It even documents that
> developers should use preferredLayoutAttributesFittingAttributes for this
> very purpose.
>
> The reason I don't want to subclass flow layout is that I pretty much want
> the exact functionality the default flow layout provides:
>
> 1. Automatically calculating layout rects that flow across lines.
> 2. Calculating the height of cells dynamically at runtime via
> 'estimatedItemSize'
>
> Given that, I'm open to ideas on what I should override in a layout subclass.
> Particularly ones that don't require me to reimplement #1 and #2 above.
>
> Doug Hill
>
>> On Aug 10, 2016, at 2:16 PM, Jonathan Hull <[email protected]
>> <mailto:[email protected]>> wrote:
>>
>> Because you are trying to make the width of the cell the same size as the
>> collection view, I would strongly consider writing a small subclass of flow
>> layout. It honestly sounds like less work than what you are dealing with
>> now.
>>
>> Thanks,
>> Jon
>>
>>> On Aug 10, 2016, at 1:29 PM, Doug Hill <[email protected]
>>> <mailto:[email protected]>> wrote:
>>>
>>>>
>>>> On Aug 10, 2016, at 11:10 AM, Doug Hill <[email protected]
>>>> <mailto:[email protected]>> wrote:
>>>>
>>>> I'm currently trying to implement something that seems basic but has been
>>>> driving me nuts: making a Collection View with cells that are
>>>> dynamic-width and height at runtime.
>>>>
>>>
>>> Again, looking for any ideas, pointers, etc. about any of this, including
>>> whether I'm going about this the wrong way.
>>>
>>> Doug Hill
>
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