TangramKit is a powerful iOS UI framework implemented by Swift. It integrates the functions with Android layout,iOS AutoLayout,SizeClass, HTML CSS float and flexbox and bootstrap. So you can use LinearLayout,RelativeLayout,FrameLayout,TableLayout,FlowLayout,FloatLayout,LayoutSizeClass to build your App 自动布局 UIView UITableView UICollectionView
Why do you think that https://github.com/SimeonRumy/constraints is a good alternative to TangramKit