The Core iOS Developer’s Cookbook, Fifth Edition

Controllers

To build a controller, first create and set up a layout object and then allocate the new instance and initialize it with the prepared layout:

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UICollectionViewFlowLayout *layout =     [[UICollectionViewFlowLayout alloc] init]; layout.scrollDirection = UICollectionViewScrollDirectionHorizontal; MyCollectionController *mcc = [[MyCollectionController alloc]     initWithCollectionViewLayout:layout];

This snippet uses a collection view flow layout in its default form, only setting the scroll direction. As you’ll see through this chapter, you can do a lot more with layouts. Typically, you set additional properties or subclass system-supplied layouts and add your own behavior.

As a rule, you use the UICollectionViewFlowLayout ...