Collection View Layout Animations
After a pinch out has occurred on the custom layout, the newly presented layout has a unique feature. The cells in each row are larger the closer they are to the center of the view along the y axis, as shown in Figure 20.11.
Figure 20.11 Sample app: custom layout example.
As the user scrolls, the size of the cells will change dynamically depending on their proximity to the center of the view. To achieve this effect, some custom logic is implemented in the PHGAnimatingFlowLayout class. The first piece is required to tell the layout that it should recalculate the layout attributes of each cell when scrolling occurs. ...
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