支持voice over

xiaoxiao2025-10-22 7

开启VoiceOver：

iPhone 设置-->通用 -->辅助功能 -->VoiceOver 开启VoiceOver后交户意义会发生变化：

轻点一下来选择项目轻点两下激活所选项目三指轻扫来滚动

VoiceOver功能

voice over辅助功能和特点

模拟器调试VoiceOver

单击：a single-click focuses the inspector on an element

双击：simulate a tap on an element

滚动：先把"Accessibility inspector"关闭，用鼠标滚动或者双手触控键盘滑动

给自定义UI视图设置voice over

两个方法： 1.设置isAccessibilityElement

self.isAccessibilityElement = YES; self.accessibilityLabel ＝ @"ovice over 提示内容"; /* 设置属性 */

2.遵守UIAccessibility协议，并实现其中isAccessibilityElement方法

/* 设置属性的方法 */ - (BOOL)isAccessibilityElement { return YES; }

设置子View voice over

如果视图还含有子视图，并且是这些子视图与用户交互。比如UITableView视图，我们需要设置子视图UITableViewCell的voice over属性，同时保证UITableView不支持voice over。

两个方法：

1.只给子视图设置isAccessibilityElement。比如UITableView视图不设置isAccessibilityElement，直接设置UITableViewCell的isAccessibilityElement，和accessibilityLabel。

2.自定义的父视图（子视图的容器）实现 UIAccessibilityContainer 协议. 这个协议定义了一个数组accessibleElements存储着所有voice over 可访问的元素。

@implementation MultiFacetedView - (NSArray *)accessibleElements { if ( _accessibleElements != nil ) { return _accessibleElements; } _accessibleElements = [[NSMutableArray alloc] init]; /* Create an accessibility element to represent the first contained element and initialize it as a component of MultiFacetedView. */ UIAccessibilityElement *element1 = [[[UIAccessibilityElement alloc] initWithAccessibilityContainer:self] autorelease]; /* Set attributes of the first contained element here. */ [_accessibleElements addObject:element1]; /* Perform similar steps for the second contained element. */ UIAccessibilityElement *element2 = [[[UIAccessibilityElement alloc] initWithAccessibilityContainer:self] autorelease]; /* Set attributes of the second contained element here. */ [_accessibleElements addObject:element2]; return _accessibleElements; } /* The container itself is not accessible, so MultiFacetedView should return NO in isAccessiblityElement. */ - (BOOL)isAccessibilityElement { return NO; } /* The following methods are implementations of UIAccessibilityContainer protocol methods. */ - (NSInteger)accessibilityElementCount { return [[self accessibleElements] count]; } - (id)accessibilityElementAtIndex:(NSInteger)index { return [[self accessibleElements] objectAtIndex:index]; } - (NSInteger)indexOfAccessibilityElement:(id)element { return [[self accessibleElements] indexOfObject:element]; } @end

自定义属性信息

两个方法：

直接设置性

@implementation MyCustomViewController - (id)init { _view = [[MyCustomView alloc] initWithFrame:CGRectZero]; [_view setIsAccessibilityElement:YES]; [_view setAccessibilityTraits:UIAccessibilityTraitButton]; [_view setAccessibilityLabel:NSLocalizedString(@"提示的内容", nil)]; [_view setAccessibilityHint:NSLocalizedString(@"提示", nil)]; }

实现UIAccessibility的方法

@implementation MyCustomView - (BOOL)isAccessibilityElement { return YES; } - (NSString *)accessibilityLabel { return NSLocalizedString(@"MyCustomView.label", nil); } /* This custom view behaves like a button. */ - (UIAccessibilityTraits)accessibilityTraits { return UIAccessibilityTraitButton; } - (NSString *)accessibilityHint { return NSLocalizedString(@"MyCustomView.hint", nil); } @end

UITableView支持Voice Over

如果你的UItableViewCell的里面还有很多子 view，并且你想点击它们的时候有反应。你需要：

让每个元素独立地支持voice overTableView cell不支持voice over（not accessible）cell元素的label简单描述cell的整体内容

在UITabaleViewCell类本就设计遵守UIAccessibilityContainer，所以我们可以直接写

@implementation CurrentWeather /* This is a view that provides weather information. It contains a city subview and a temperature subview, each of which provides a separate label. */ - (NSString *)accessibilityLabel { NSString *weatherCityLabel = [self.weatherCity accessibilityLabel]; NSString *weatherTempLabel = [self.weatherTemp accessibilityLabel]; /* Combine the city and temperature information so that VoiceOver users can get the weather information with one gesture. */ return [NSString stringWithFormat:@"%@, %@", weatherCityLabel, weatherTempLabel]; } @end

或者，设置

self.accessibilityLabel ＝ @"ovice over 提示内容";