ios - 如何通过调用接收器扬声器播放 AVSpeechSynthesizer？

Question

我喜欢通过调用接收器扬声器播放音频，目前我正在使用它来播放一些文本作为音频。

AVSpeechUtterance *utterance = [AVSpeechUtterance speechUtteranceWithString:_strTextCheck];
    AVSpeechSynthesizer *syn = [[AVSpeechSynthesizer alloc] init];
    [syn speakUtterance:utterance];

我明白了，但这不适用于 AVSpeechSynthesizer:

[AVAudioSession  overrideOutputAudioPort:AVAudioSessionPortOverrideSpeaker error:&error];

正确的是它在普通扬声器上工作，但我想通过调用接收器扬声器播放，是否可以这样做？

Answer 1

默认行为是通过调用接收器播放。因此，如果您取消设置覆盖 - 或者不首先设置它 - 您应该得到您想要的行为:

[[AVAudioSession sharedInstance] 
     overrideOutputAudioPort:AVAudioSessionPortOverrideNone
                       error:nil];

这是一个完整的例子。您还需要设置 audioSession 类别。

- (void)playVoice {
    [[AVAudioSession sharedInstance] 
             setCategory:AVAudioSessionCategoryPlayAndRecord
                  error:nil];

    //try one or the other but not both...

    //[self playVoiceOnSpeaker:@"test test test"];

    [self playVoiceOnReceiver:@"test test test"];

}

-(void)playVoiceOnSpeaker:(NSString*)str
{
    [[AVAudioSession sharedInstance]  
         overrideOutputAudioPort:AVAudioSessionPortOverrideSpeaker
                           error:nil];
    [self playVoiceByComputer:str];
}

-(void)playVoiceOnReceiver:(NSString*)str
{
    [[AVAudioSession sharedInstance]
         overrideOutputAudioPort:AVAudioSessionPortOverrideNone
                           error:nil];
    [self playVoiceByComputer:str];
}

-(void)playVoiceByComputer:(NSString*)str
{
    AVSpeechUtterance *utterance = 
          [AVSpeechUtterance speechUtteranceWithString:str];
    AVSpeechSynthesizer *syn = [[AVSpeechSynthesizer alloc] init];
    [syn speakUtterance:utterance];
}