¿Cuáles son tres de las responsabilidades principales de un objeto UIView?

What are three of the primary responsibilities of a UIView object?

iOS Fundamentals — UIView: Three Major Responsibilities

• drawing and animation,
• layout and subview management, and.
• Event handling.

This rectangle defines the size and position of the view in its superview’s coordinate system. Use this rectangle during layout operations to set the size and position the view. Changing the frame rectangle automatically redisplays the view without calling its draw(_:)

All UIView subclasses have a layer property, which is responsible for drawing their contents efficiently. These layers are powered by Core Animation, which handles all the drawing and animation that UIKit requests.

UI-Router applications are modeled as a tree of states. Each application state (generally) has a view declared on it. The view is the component which provides the user interface for that state. When an application state is activated, the view (component) for that state is rendered.

The bounds of an UIView is the rectangle, expressed as a location (x,y) and size (width,height) relative to its own coordinate system (0,0). The frame of an UIView is the rectangle, expressed as a location (x,y) and size (width,height) relative to the superview it is contained within.

11 Answers. The bounds of an UIView is the rectangle, expressed as a location (x,y) and size (width,height) relative to its own coordinate system (0,0). The frame of an UIView is the rectangle, expressed as a location (x,y) and size (width,height) relative to the superview it is contained within.

Frame A view’s frame ( CGRect ) is the position of its rectangle in the superview ‘s coordinate system. By default it starts at the top left. Bounds A view’s bounds ( CGRect ) expresses a view rectangle in its own coordinate system.

Returns a rectangle with the specified coordinate and size values.

A view defines the elements that appear when a user opens a form or a list, and you can switch the view from the default for lists and forms. Administrators and users with the personalize role have permission to perform the key tasks related to views: create views for any list and form.

The responder chain is a series of linked responder objects. It starts with the first responder and end with the app object. If the first responder cannot handle an event, it forwards the event to the next responder in the responder chain. A responder object is an object that can respond to and handle events.

UIResponder, UIEvent and UIControl. In short, UIResponder instances represents objects that can handle and respond to arbitrary events. Many things in iOS are UIResponders , including UIView , UIViewController , UIWindow , UIApplication and UIApplicationDelegate .