UIkit框架介紹

UIKit Framework

The UIKit framework (UIKit.framework) provides crucial infrastructure for implementing graphical, event-driven apps in iOS, including the following: 

• Basic app management and infrastructure, including the app’s main run loop

• User interface management, including support for storyboards and nib files

• A view controller model to encapsulate the contents of your user interface

• Objects representing the standard system views and controls

• Support for handling touch- and motion-based events 

• Support for a document model that includes iCloud integration; see Document-Based App Programming Guide for iOS

• Graphics and windowing support, including support for external displays; see View Programming Guide for iOS

• Multitasking support; see Multitasking

• Printing support; see Drawing and Printing Guide for iOS

• Support for customizing the appearance of standard UIKit controls

• Support for text and web content

• Cut, copy, and paste support

• Support for animating user-interface content

• Integration with other apps on the system through URL schemes and framework interfaces

• Accessibility support for disabled users

• Support for the Apple Push Notification service; see Apple Push Notification Service

• Local notification scheduling and delivery; see Local Notifications

• PDF creation

• Support for using custom input views that behave like the system keyboard

• Support for creating custom text views that interact with the system keyboard

• Support for sharing content through email, Twitter, Facebook, and other services

In addition to providing the fundamental code for building your app, UIKit also incorporates support for some device-specific features, such as the following:

• The built-in camera (where present)

• The user’s photo library

• Device name and model information

• Battery state information

• Proximity sensor information

• Remote control information from attached headsets

For information about the classes of the UIKit framework, see UIKit Framework Reference.