UIResponder

UIResponder定义了一个回应和操作事件的对象的接口。

有两个基本事件：触摸事件和移动事件（touch events and motion events）

Tasks

Managing the Responder Chain

• – nextResponder
• – isFirstResponder
• – canBecomeFirstResponder
• – becomeFirstResponder
• – canResignFirstResponder
• – resignFirstResponder

Managing Input Views

•   inputView  property
•   inputAccessoryView  property
• – reloadInputViews

Responding to Touch Events

• – touchesBegan:withEvent:
• – touchesMoved:withEvent:
• – touchesEnded:withEvent:
• – touchesCancelled:withEvent:

Responding to Motion Events

• – motionBegan:withEvent:
• – motionEnded:withEvent:
• – motionCancelled:withEvent:

Responding to Remote-Control Events

• – remoteControlReceivedWithEvent:

Getting the Undo Manager

•   undoManager  property

Validating Commands

• – canPerformAction:withSender: