![]() When an event comes in, it automatically determines where focus should update and notifies your app. The focus engine listens for incoming focus-movement events in your app from all these different input devices. A user can control focus through remotes (of varying types), game controllers, the simulator, and so forth. The system within UIKit that controls focus and focus movement is called the focus engine. The UIKit items such as UIButton, UITextField, UITableView, UICollectionView, UITextView, UISegmentedControl, and UISearchBar are focused by default. For apps with custom user interface components, you need to implement custom focus behavior, as explained in the Supporting Focus Within Your App section. ![]() For example, UIButton objects are focusable, but UILabel objects are not. You can ask for focus updates programmatically but cannot set focus or move focus in a certain direction. The UIKit framework only supports focus-based interfaces, and in most cases this behavior is automatically provided where it makes sense to do so. For example, if an onscreen button is focused, the button’s action is triggered when a select event is sent from a remote. The focused view is used as the target of any user actions. In a focus-based interaction model, a single view onscreen is considered focused, and the user can move focus to other views by navigating through different UI items onscreen, which triggers a focus update. Focus refers to the effect onscreen of external, indirect user input from a remote or another input device. The item on the screen becomes focused as the user navigates through the items on the screen. The user navigates to a specific item onscreen and then presses a button on the remote to select the item. ![]() On Apple TV, a remote is used to control the interface indirectly. On iOS devices, a user interacts directly with the touchscreen. Controlling the User Interface with the Apple TV Remote
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