Will isDecerating be true when you call selectItemAt:postion:animated: of UIScrollView?

• What is sectionInsect in UICollectionView?
  • Top is the first cell’s top from bottom of headerView. Be careful, top is not calculated from the top of headerView to previous section.
• Will isDecerating be true when you call selectItemAt:postion:animated: of UIScrollView?
  • isDecerating is true when scrollView is moving after user lifts finger
  • So this is not called, when you set UIScrollView’s offset with animation.
• How to implement cell’s size changing animation.
  • Implement new size in collectionView:collectionViewLayout:sizeForItem:
  • Call collectionView.collectionViewLayout.invalidateLayout()