Use UICollectionViewFlowLayout to implement Parallax on cells in UICollectionView
- ParallaxCollectionViewFlowLayout inherited from UICollectionViewFlowLayout and could be applied into UICollectionView
- It overrides layoutAttributesForElementsInRect: method to calculate the layout attributes of cells which you want to do parallax
- It needs to define cells which should do parallax by enableParallaxCellsAtIndexPaths: or set allCellParallax YES for all
- Set CollectionView's FlowLayout being ParallaxCollectionViewFlowLayout at Interface Builder
- Set which components you want to do parallax by ParallaxCollectionViewFlowLayout *flowlayout = self.collectionView.collectionViewLayout; flowlayout.allCellParallax = YES;