Global Variable


Posted by an application when a scroll action has completed and the accessibilityScroll: method has been called.


UIAccessibilityNotifications UIAccessibilityPageScrolledNotification;


This notification includes a parameter, which is an NSString object that contains a description of the new scroll position. An assistive technology outputs the description string contained in the parameter.

Use this notification to provide custom information about the contents of the screen after a user performs a VoiceOver scroll gesture. For example, a tab-based application might provide a string such as “Tab 3 of 5,” or an application that displays information in pages might provide a string such as “Page 19 of 27.”

When an assistive technology repeatedly receives the same scroll position string, it indicates to users that a border or boundary has been reached.

Post this notification using the UIAccessibilityPostNotification function.

See Also

UI Changes


Posted by an application when a new view appears that makes up a major portion of the screen.


Posted by an application when the layout of a screen changes, such as when an element appears or disappears.


Posted by UIKit when the system’s Switch Control setting has changed.


Posted by UIKit when an assistive technology focuses on an element.


Posted by UIKit when the system’s Reduce Transparency system setting has changed.