![]() You typically set it up in your flow layout initializer by using the UIDynamicAnimator collection view-specific initializer. To support dynamic animation, your custom class must coordinate with an animator instance. With custom subclasses, you can extend the class to produce eye-catching and nuanced results. ![]() In the most basic form, the layout properties provide you with a geometric vocabulary, where you talk about row spacing, indentation, and item-to-item margins. Their properties and instance methods specify how the flow sets itself up to place items onscreen. Flow layouts create organized presentations in your application. The key to using dynamic animation classes with collection views is to build your own custom UICollectionViewFlowLayout So although you don’t work directly with views, you’re still well set to introduce dynamics. Each instance provides the required bounds, center, and transform properties you need to work with dynamic animators. The UICollectionViewLayoutAttributes class, which represents items in the collection view, conforms to this protocol. The core of the dynamic animator system is the UIDynamicItem protocol. The dynamic behavior set is identical to that used for normal view animation, but the collection view approach requires a bit more overhead and bookkeeping as views may keep appearing and disappearing during scrolls. Dynamic animators add liveliness to your presentations during scrolling and when views enter and leave the system. Leveraging the power of dynamic animators in collection views is possible courtesy of a few UIKit extensions. Learn More Buy Collection Views and Dynamic Animators Gourmet iOS Developer's Cookbook, The: Even More Recipes for Better iOS App Development
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