How to calculate iOS 11 size in different orientation?

user_8633187 0
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I calculate itemSize dependent on safe area for UICollectionView with horizontal scroll and custom layout.

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But for iPhone X safe area has different size for different orientation. My question is how should I calculate safe area size for landscape orientation in viewWillTransition function? Or how is it possible to do without this calculation?

ios11 xcode9 safearealayoutguide swift ios
2 Answers

Use UICollectionViewDelegateFlowLayout's collectionView(_:layout:sizeForItemAt:). Works like a charm. Setting the size in the completion block of coordinator.animate(alongsideTransition:completion:) in viewWillTransition(to:with:) didn't work for me because the size animation occurs after the orientation animation ends, which looks weird.

user_22748290
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