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[英]"Shadow insert is nil. File a bug on UICollectionView!" error when drag&dropping a UICollectionViewCell
當我在 UICollectionView 中拖放一個單元格時,有時會發生此崩潰: -[_UICollectionViewDragAndDropController _beginDragAndDropInsertingItemAtIndexPath:]、_UICollectionViewDragAn ...