This demo showcases the UICollectionView in 3 different layouts
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Grid (default) layout with fixed cell size
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Grid (default) layout with cell size adapted to the device screen
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Custom waterfall layout with content aware self sizing cells
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| ![] (https://github.com/melissayung/CollectionViewLayouts/blob/master/CollectionViewLayouts/Screenshots/Waterfall-Content-Aware-SelfSizing-Cells.png)
Accompanying blog post: https://myioscache.wordpress.com/2016/10/23/experimenting-with-the-uicollectionview-flow-layouts/