The Core iOS Developer’s Cookbook, Fifth Edition

Flow Layouts

Flow layouts provided by the UICollectionViewFlowLayout class create organized grid presentations in an application. They provide built-in properties that you edit directly or establish via delegate callbacks. These properties specify how the flow sets itself up to place items onscreen. In its most basic form, the layout properties provide you with a geometric vocabulary, where you talk about row spacing, indentation, and item-to-item margins.