iOS 9检测静音模式 [英] iOS 9 detect silent mode

问题描述

我已经寻找了很长时间，在放弃之前将其发布在这里作为最后的尝试. 我想检测我当前是否处于静音模式.

I've been looking for a long time, posting here as a final try before giving up. I want to detect if I'm currently on Silent mode or not.

我发现了一种变通办法(播放假声音并检查完成情况)，但仅当我不在AVAudioSessionCategoryPlayAndRecord模式时，该变通办法才能正常工作. 正是在屏幕上，我可以在其中录制想要实现的音频和视频，从而知道是否应该播放UI声音.

I found a workaround (playing a fake sound and checking the completion) that works fine but only when I'm not in AVAudioSessionCategoryPlayAndRecord mode. This is precisely on a screen where I can record audio and video that I want to achieve this in order to know whether I should play UI sounds or not.

总而言之，我试图找到一种在AVAudioSessionCategoryPlayAndRecord模式下检测静默模式的方法.

To sum up, I trying to find a way to detect silent mode when on AVAudioSessionCategoryPlayAndRecord mode.

推荐答案

这里是一种尝试通过将音频会话类别短暂切换到SoloAmbient(确实尊重无声开关的类别)来尝试读取开关的解决方案-读取开关-然后切换回去.这可能是最适合您的方法.

Here is a solution that attempts reading the switch by switching the audio session category briefly to SoloAmbient (a category that does respect the silent switch) - reading the switch - and then switching back. this might be the best approach for you.

如果交换音频会话类别会干扰您的应用，我建议也许在播放音频之前进行检查，并使用您检测到的值，然后对静音开关进行反应.这是一个变通方法，但它应该为您提供一些信息.

if swapping audio session category would interfere with your app, i would suggest perhaps conduct a check before playing audio and use the value you detect then react to silent switch on/off. It is a work around but it should give you some information.

切换到环境类别，确定静音开关是否打开，然后将会话切换回我需要的音频设置.在确定开关是否打开之后，您将需要确定所需的音频会话类别，并切换到该类别.

switch to ambient category, determine if the silent switch is on, then switch session back to the audio settings I require. You will need to work out what audio session category you need and swap to that after you determine if the switch is on.

-(BOOL)muteSwitchEnabled {

    #if TARGET_IPHONE_SIMULATOR
    // set to NO in simulator. Code causes crashes for some reason.
    return NO;
    #endif

    // switch to Ambient to detect the switch
    AVAudioSession* sharedSession = [AVAudioSession sharedInstance];
    [sharedSession setCategory:AVAudioSessionCategoryAmbient error:nil];

    CFStringRef state;
    UInt32 propertySize = sizeof(CFStringRef);
    AudioSessionInitialize(NULL, NULL, NULL, NULL);
    AudioSessionGetProperty(kAudioSessionProperty_AudioRoute, &propertySize, &state);

    BOOL muteSwitch = (CFStringGetLength(state) <= 0);
    NSLog(@"Mute switch: %d",muteSwitch);

    // code below here is just restoring my own audio state, YMMV
    _hasMicrophone = [sharedSession inputIsAvailable];
    NSError* setCategoryError = nil;

    if (_hasMicrophone) {

        [sharedSession setCategory: AVAudioSessionCategoryPlayAndRecord error: &setCategoryError];

        // By default PlayAndRecord plays out over the internal speaker.  We want the external speakers, thanks.
        UInt32 ASRoute = kAudioSessionOverrideAudioRoute_Speaker;
        AudioSessionSetProperty (kAudioSessionProperty_OverrideAudioRoute,
        sizeof (ASRoute),m&ASRoute);
    } else {
        // Devices with no mic don't support PlayAndRecord - we don't get playback, so use just playback as we don't have a microphone anyway
        [sharedSession setCategory: AVAudioSessionCategoryPlayback error: &setCategoryError];

        if (setCategoryError) {
            NSLog(@"Error setting audio category! %@", setCategoryError);
        }
        return muteSwitch;
    }
}

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