将音频输出切换到扬声器和麦克风

Question

我在用扬声器和麦克风切换音频时遇到问题。首先，当应用程序启动音频播放到默认扬声器时。然后按下按钮事件，我切换到麦克风，它在麦克风中播放。

但当我试着切换回扬声器时，它的麦克风播放对我来说不起作用。

代码

 - (IBAction)setSpeakerPhoneEnabled:(UIButton *)sender
{
    AVAudioSession* session = [AVAudioSession sharedInstance];
    BOOL success;
    NSError* error;
    if (isHeadPhone) {
        [session setCategory:AVAudioSessionCategoryPlayAndRecord
                                 error:&error];
        UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_Speaker;
        AudioSessionSetProperty (kAudioSessionProperty_OverrideAudioRoute,sizeof (audioRouteOverride),&audioRouteOverride);

    }
    else{
        success = [session setCategory:AVAudioSessionCategoryPlayback
                                 error:&error];
        UInt32 audioRouteOverride = kAudioSessionOutputRoute_Headphones;
        AudioSessionSetProperty(kAudioSessionProperty_OverrideAudioRoute, sizeof(audioRouteOverride), &audioRouteOverride);
    }

    isHeadPhone = !isHeadPhone;
    [self setTheSpekerImage];
}

请告诉我什么时候我做了错误的

Answer 1

我已经完成了以下代码

    - (IBAction)setSpeakerPhoneEnabled:(UIButton *)sender
{
    AudioSessionInitialize (NULL, NULL, NULL, NULL);


    if (isHeadPhone) {

        UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_Speaker;
        AudioSessionSetProperty (kAudioSessionProperty_OverrideCategoryDefaultToSpeaker,sizeof (audioRouteOverride),&audioRouteOverride);
         [[AVAudioSession sharedInstance] setActive:YES error:nil];

    }
    else{
        UInt32 dataSize = sizeof(CFStringRef);
        CFStringRef currentRoute = NULL;
        OSStatus result = noErr;
        AudioSessionGetProperty(kAudioSessionProperty_AudioRoute, &dataSize, &currentRoute);
        // Set the category to use the speakers and microphone.
        UInt32 sessionCategory = kAudioSessionCategory_PlayAndRecord;
        result = AudioSessionSetProperty (
                                          kAudioSessionProperty_AudioCategory,
                                          sizeof (sessionCategory),
                                          &sessionCategory
                                          );
        assert(result == kAudioSessionNoError);
        Float64 sampleRate = 44100.0;
        dataSize = sizeof(sampleRate);
        result = AudioSessionSetProperty (
                                          kAudioSessionProperty_PreferredHardwareSampleRate,
                                          dataSize,
                                          &sampleRate
                                          );
        assert(result == kAudioSessionNoError);
        // Default to speakerphone if a headset isn't plugged in.
        // Overriding the output audio route
        UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_None;
        dataSize = sizeof(audioRouteOverride);
        AudioSessionSetProperty(
                                kAudioSessionProperty_OverrideAudioRoute,
                                dataSize,
                                &audioRouteOverride);
        assert(result == kAudioSessionNoError);
        AudioSessionSetActive(YES);
//
    }

    isHeadPhone = !isHeadPhone;
    [self setTheSpekerImage];
}