UICollectionView sticky header (sectionHeadersPinToVisibleBounds) disappears for while after inserting section when collection is overscrolled (bounce effect)
Originator: | jm.jakubmarek | ||
Number: | rdar://48363057 | Date Originated: | February 25 2019 |
Status: | Open | Resolved: | |
Product: | iOS + SDK | Product Version: | iOS 11.x and 12.x |
Classification: | Reproducible: | Always |
Area: UIKit Summary: ======== `UICollectionView` with - `UICollectionViewCell` cells - `UICollectionReusableView` section headers - `UICollectionViewFlowLayout` collections's layout - `sectionHeadersPinToVisibleBounds ` is enabled If the insertion (`insertItemsAtIndexPaths` inside `performBatchUpdates` block) happens when collection is overscrolled (bounce is enabled), header will disappear for while. See attached video. Steps to Reproduce: =============== Start the attached example project and scroll to the bottom quickly and keep collection overscrolled (keep it bouncing - as you can see in the attached video). Expected Results: ============= Header will be unchanged after section insertion (sticky). See attached "Expected look" image. Actual Results: =========== Header disappears when insertion becomes during collection overscroll at the bottom (bounce effect). See attached "Look after section insertion with overscrolled collection" image. Version/Build: ========== iPhone 7 with iOS 12.1.4 or any simulator with iOS 11.x and 12.x Configuration: ========== iPhone 7 with iOS 12.1.4 or any simulator with iOS 11.x and 12.x
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Example project, video and images showing described issue:
https://github.com/jmarek41/Collection-sticky-headers