Objective-C源代码

This sample shows how to use a keyboard accessory view. The application uses a single view controller. The view controller's view is covered by a text view. When you tap the text view, the view controller loads a nib file containing an accessory view that it adds to the text view. The accessory view contains a button. When you tap the button, the text "You tapped me." is added to the text view. The sample also shows how you can use the keyboard-will-show and keyboard-will-hide notifications to animate resizing a view that is obscured by the keyboard.