问题
UICollectionViewFlowLayout goes left-to-right in a row, then wraps to the next row. I want a layout that goes top-to-bottom, then wraps back up to the next column. Think of it as a UITableView that wraps into multiple columns, which scrolls horizontally.
UICollectionViewFlowLayout is close to what I want – can I subclass it or must I subclass UICollectionViewLayout and start from scratch? (This answer leads me to believe I can't use flow layout.)
Visible Screen
[ 1 6 11 ] 16
[ 2 7 12 ] 17
[ 3 8 13 ] 18
[ 4 9 14 ]
[ 5 10 15 ]
回答1:
You can achieve it using UICollectionViewFlowLayout - just set the property 'scrollDirection' to 'UICollectionViewScrollDirectionHorizontal' and you get what you want.
About UICollectionViewLayout:
UICollectionViewLayout is meant to be subclassing. You need to override some methods over there in order to get a specific layout. Take a look at the documentation, or WWDC 2012 video tutorial.
回答2:
This might point you in the right direction: https://github.com/chiahsien/UICollectionViewWaterfallLayout
You might want to create your own layout subclass, which is not as hard as it might sound. See this tutorial: http://skeuo.com/uicollectionview-custom-layout-tutorial
来源：https://stackoverflow.com/questions/17298520/on-ios-can-you-use-uicollectionviewflowlayout-to-get-a-vertical-column-layout