iphone - How to catch the iPhone VoiceOver event?

Question

Is there any way to catch the [VoiceOver - ON/OFF] event in my application?

I need to make my menu behave differently in two cases, using voiceover and normal way.

Answer 1

UIAccessibilityIsVoiceOverRunning()

BOOL YES如果它正在运行，则返回 a 。这是 iOS 4 及更高版本。

Answer 2

如果您需要它作为通知，UIAccessibilityVoiceOverStatusChanged（也是 4.0+）。

Answer 3

在您的应用委托的applicationDidFinishLaunching:方法中，订阅 VoiceOver 状态更改，如下所示：

//  subscribing to VoiceOver change notification:
[[NSNotificationCenter defaultCenter]
     addObserver:self
     selector:@selector(didChangeVoiceOverSetting:)
     name:UIAccessibilityVoiceOverStatusChanged
     object:nil];

然后做任何你需要做的事情。在我的应用程序中，我在代码的 viewDidLoad 方法中设置了大量可访问性代码，因此最简单的方法是在 VoiceOver 更改时使应用程序崩溃并允许重新初始化所有内容：

- (void)didChangeVoiceOverSetting:(NSNotification *)dictionary {
    // intentionally crashing the app if VoiceOver is changed
    assert(false);
}