(informal protocol)
Adopted by | |
Framework | /System/Library/Frameworks/UIKit.framework |
Companion guide | |
Declared in | UIAccessibility.h |
The UIAccessibilityContainer
informal protocol provides a way for UIView
subclasses to make selected components accessible as separate elements. For example, a view might contain icons or drawn text that, to end users, appear and function as separate items. But because these components are not implemented as instances of UIView
, they are not automatically accessible to users with disabilities. Therefore, such a container view should implement the UIAccessibilityContainer
methods to supply accessibility information about these components to assistive applications such as VoiceOver.
A view that implements the UIAccessibilityContainer
informal protocol uses the UIAccessibilityElement
method initWithAccessibilityContainer:
to create an accessibility element to represent each non-view component that needs to be accessible to users with disabilities. Note, however, that the container view itself is not an accessibility element because users interact with the contents, not with the container. This means that a container view that implements the UIAccessibilityContainer
methods must set to NO
the isAccessibilityElement
property of the UIAccessibility
informal protocol.
The order of accessibility elements within the container view should be the same as the order in which the represented elements are presented to the user, from top-left to bottom-right.
Returns the accessibility element at the specified index.
- (id)accessibilityElementAtIndex:(NSInteger)index
The index of the accessibility element.
The accessibility element at the specified index, or nil
if none exists.
UIAccessibility.h
Returns the number of accessibility elements in the container.
- (NSInteger)accessibilityElementCount
The number of accessibility elements in the container. By default, this method returns 0
.
UIAccessibility.h
Returns the index of the specified accessibility element.
- (NSInteger)indexOfAccessibilityElement:(id)element
The accessibility element.
The index of the specified accessibility element, or NSNotFound
if the element does not exist.
UIAccessibility.h
Last updated: 2010-05-18