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SemanticsObjectContainer Class Reference

`#import <SemanticsObject.h>`

Inheritance diagram for SemanticsObjectContainer:

## Instance Methods
(instancetype) | - NS_UNAVAILABLE
(instancetype) | - initWithAccessibilityContainer:
(instancetype) | - initWithSemanticsObject:bridge:

## Class Methods
(instancetype) | + NS_UNAVAILABLE

## Properties
SemanticsObject * | semanticsObject

## Detailed Description

Represents a semantics object that has children and hence has to be presented to the OS as a UIAccessibilityContainer.

The SemanticsObject class cannot implement the UIAccessibilityContainer protocol because an object that returns YES for isAccessibilityElement cannot also implement UIAccessibilityContainer.

With the help of SemanticsObjectContainer, the hierarchy of semantic objects received from the framework, such as:

SemanticsObject1 SemanticsObject2 SemanticsObject3 SemanticsObject4

is translated into the following hierarchy, which is understood by iOS:

SemanticsObjectContainer1 SemanticsObject1 SemanticsObjectContainer2 SemanticsObject2 SemanticsObject3 SemanticsObject4

From Flutter's view of the world (the first tree seen above), we construct iOS's view of the world (second tree) as follows: We replace each SemanticsObjects that has children with a SemanticsObjectContainer, which has the original SemanticsObject and its children as children.

SemanticsObjects have semantic information attached to them which is interpreted by VoiceOver (they return YES for isAccessibilityElement). The SemanticsObjectContainers are just there for structure and they don't provide any semantic information to VoiceOver (they return NO for isAccessibilityElement).

Definition at line 226 of file SemanticsObject.h.

## Method Documentation

## ◆ initWithAccessibilityContainer:

- (instancetype) initWithAccessibilityContainer: |  | (id) | NS_UNAVAILABLE |

## ◆ initWithSemanticsObject:bridge:

- (instancetype) initWithSemanticsObject: |  | (SemanticsObject*) | semanticsObject
bridge: |  | (fml::WeakPtr<flutter::AccessibilityBridgeIos>) | NS_DESIGNATED_INITIALIZER

Definition at line 911 of file SemanticsObject.mm.

911 :(SemanticsObject*)semanticsObject
912 bridge:(fml::WeakPtr<flutter::AccessibilityBridgeIos>)bridge {
913 FML_DCHECK(semanticsObject) << "semanticsObject must be set";
914 // Initialize with the UIView as the container.
915 // The UIView will not necessarily be accessibility parent for this object.
916 // The bridge informs the OS of the actual structure via
917 // `accessibilityContainer` and `accessibilityElementAtIndex`.
918 self = [super initWithAccessibilityContainer:bridge->view()];
919
920 if (self) {
921 _semanticsObject = semanticsObject;
922 _bridge = bridge;
923 }
924
925 return self;
926 }

References _bridge.

## ◆ NS_UNAVAILABLE [1/2]

- (instancetype) NS_UNAVAILABLE |  |  |

## ◆ NS_UNAVAILABLE [2/2]

+ (instancetype) NS_UNAVAILABLE |  |  |

## Property Documentation

## ◆ semanticsObject

- (SemanticsObject*) semanticsObject
| read write nonatomic weak

Definition at line 234 of file SemanticsObject.h.

The documentation for this class was generated from the following files:

- shell/platform/darwin/ios/framework/Source/SemanticsObject.h
- shell/platform/darwin/ios/framework/Source/SemanticsObject.mm

SemanticsObjectContainer::semanticsObject
SemanticsObject * semanticsObject
Definition: SemanticsObject.h:234
_bridge
fml::WeakPtr< flutter::AccessibilityBridgeIos > _bridge
Definition: SemanticsObject.mm:897
SemanticsObject
Definition: SemanticsObject.h:30