[iOS] updated intrinsic content size for UICollectionView #5993
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Related Issue
Image collection view returns zero intrinsic content size when the super view's width is zero.
Description
iOS AdaptiveCards width constraint is no longer required, and the intrinsic content size can be zero because of that. This PR returns the intrinsic content size as if all images are laid in a single row if the width is not yet determined. When the width is determined, a new intrinsic content size is calculated and ask for the layout engine to update the layout.
Sample Card
https://github.com/microsoft/AdaptiveCards/blob/main/samples/v1.0/Elements/ImageSet.json
https://github.com/microsoft/AdaptiveCards/blob/main/samples/v1.0/Scenarios/ImageGallery.json
https://github.com/microsoft/AdaptiveCards/blob/main/samples/v1.2/Scenarios/Agenda.json
How Verified
How you verified the fix, including one or all of the following:
Microsoft Reviewers: Open in CodeFlow