Question

我以非常标准的方式调用iOS文本到语音：

static AVSpeechSynthesizer* synthesizer = NULL;
//...
+(void)readText:(NSString*)text
{
    if(synthesizer == NULL)
    synthesizer = [[AVSpeechSynthesizer alloc] init];
    AVSpeechUtterance *utterance = [AVSpeechUtterance speechUtteranceWithString:text];
    utterance.voice = [AVSpeechSynthesisVoice voiceWithLanguage:@"fr-FR"];
    [synthesizer speakUtterance:utterance];
}

它完成了这项工作，除了一个问题：当铃声在设备上静音时，文本到语音也被静音。即使振铃器静音，我该如何使它工作？

Answer 1

取消设备取消静音

static AVSpeechSynthesizer* synthesizer = NULL;
//...
+(void)readText:(NSString*)text
{
    if(synthesizer == NULL)
    synthesizer = [[AVSpeechSynthesizer alloc] init];
    AVSpeechUtterance *utterance = [AVSpeechUtterance speechUtteranceWithString:text];
    utterance.voice = [AVSpeechSynthesisVoice voiceWithLanguage:@"fr-FR"];

    //Add the following code to active audio
    NSError *setCategoryErr = nil;
    NSError *activationErr  = nil;
    [[AVAudioSession sharedInstance] setCategory: AVAudioSessionCategoryPlayback error:&setCategoryErr];
    //magic is here
    [[AVAudioSession sharedInstance] setActive:YES error:&activationErr]; 

    //speech your text
    [synthesizer speakUtterance:utterance];
}

Answer 2

iOS音频会话类别是正确答案：https://developer.apple.com/library/content/documentation/Audio/Conceptual/AudioSessionProgrammingGuide/AudioSessionCategoriesandModes/AudioSessionCategoriesandModes.html。

默认值为AVAudioSessionCategorySoloAmbient，但如果音频功能是应用程序的核心（我们的情况），则应将其设置为AVAudioSessionCategoryPlayback：

[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];

Answer 3

感谢Leo Cavalcante。设置AVAudioSession setCategory等之后，它解决了我的问题。

我在下面添加了快速代码。

do {
        try AVAudioSession.sharedInstance().setCategory(.playback, mode: .default)
        try AVAudioSession.sharedInstance().setActive(true)
       // try AVAudioSession.sharedInstance().overrideOutputAudioPort(.speaker)
    } catch let error as NSError {
        print("audioSession error: \(error.localizedDescription)")
    }

当铃声静音时，使iOS文本到语音工作

3 个答案: