AVSpeechSynthesizer continueSpeaking不工作

Question

我已经创建了一个AVSpeechSynthesizer并开始播放AVSpeechUtterance。这可以很好地工作。如果用户按下按钮，我会暂停合成器。这也是可行的。但是，当我尝试使用continueSpeaking方法重新启动合成器时，什么也没有发生。如果我检查isSpeaking属性，它仍然是NO。如何才能让音频从中断的位置重新开始播放？

AVSpeechSynthesizer *synthesizer_;

synthesizer_ = [[AVSpeechSynthesizer alloc] init];
synthesizer_.delegate = self;


- (void)textToSpeech{
    AVSpeechUtterance *utterance = [[AVSpeechUtterance alloc]initWithString:itemText];
    utterance.voice = [AVSpeechSynthesisVoice voiceWithLanguage:localeCode];
    utterance.rate = UTTERANCE_RATE;
    utterance.preUtteranceDelay = itemDelayTimeInterval;
    [synthesizer_ speakUtterance:utterance];
}

- (IBAction)pauseButtonPressed:(id)sender {
    if (synthesizer_.isSpeaking) {
        [synthesizer_ pauseSpeakingAtBoundary:AVSpeechBoundaryWord];
    }
    else{
        [synthesizer_ continueSpeaking];
    }

}

Answer 1

你的原始代码是：

if (synthesizer_.isSpeaking) {

试着这样做：

if (![synthesizer_ isPaused])

原因：

一个布尔值，指示合成器是否正在说话。(只读)

@property(nonatomic, readonly, getter=isSpeaking) BOOL speaking

如果合成器正在发言或有发言排队等待发言，则讨论返回YES，即使它当前处于暂停状态。如果合成器已完成其队列中的所有发声，或者尚未发出发声，则返回NO。

在iOS 7.0及更高版本中可用。在AVSpeechSynthesis.h中声明

因此，如果使用此属性，并且语音已暂停，则此属性可能为true，并且语音继续代码将不会运行。

Answer 2

只要从isPaused开始，它就会工作得很好：

注意:使用AVSpeechBoundaryImmediate代替AVSpeechBoundaryWord可以获得更好的效果。

- (IBAction)pauseButtonPressed:(id)sender {
    if (synthesizer_.isPaused) {
        [synthesizer_ continueSpeaking];
    }
    else{
        [synthesizer_ pauseSpeakingAtBoundary: AVSpeechBoundaryImmediate];
    }
}

Answer 3

尝试使用以下代码

-(void)stopSpeechReading
{
    if([synthesize isSpeaking]) {
        NSLog(@"Reading has been stopped");
        [synthesize stopSpeakingAtBoundary:AVSpeechBoundaryImmediate];
        AVSpeechUtterance *utterance = [AVSpeechUtterance speechUtteranceWithString:@""];
        [synthesize speakUtterance:utterance];
        [synthesize stopSpeakingAtBoundary:AVSpeechBoundaryImmediate];
    }
}
-(void)pauseSpeechReading
{
    if([synthesize isSpeaking]) {
        NSLog(@"Reading paused");
        [synthesize pauseSpeakingAtBoundary:AVSpeechBoundaryImmediate];
        AVSpeechUtterance *utterance = [AVSpeechUtterance speechUtteranceWithString:@""];
        [synthesize speakUtterance:utterance];
        [synthesize pauseSpeakingAtBoundary:AVSpeechBoundaryImmediate];
    }
}
-(void)resumeSpeechReading
{
     NSLog(@"Reading resumed");
    [synthesize continueSpeaking];
}