Is indexPathsForVisibleItems sorted?

• How to fix bug of calling selectItem:at:position:animation of UICollectionView sometimes does not trigger isSelected state changing?
  • It seem to be a bug of UICollectionView, sometime, the when call this method, the isSelected state of the target cell is not changed.
  • Call UICollectionView.reloadData() first
  • Then call selectItem:at:position:animation
• How to draw a bezierPath with some corners round clipped.
  • Using medthod init(roundedRect: byRounddingCorners:cornderRadii)
  • You can pass needed corner to UIRectCorner
• How to get differences of a file with a history version in git?
  • Gd #md5OfCommit #filepath
• Is the first indexPath always the first indexPath in indexPathsForVisibleItems?
  • No
  • So if you want to get the topMost cell that is visible now, you should sort this array first