Question

我希望在AVSpeechSynthesizer讲话时在我的应用上显示一个视图，并且当视频停止讲话时视图会消失。

-(void)speakText {
    AVSpeechSynthesizer *synthesizer = [[AVSpeechSynthesizer alloc] init];
    float speechSpeed = 0.12;
    AVSpeechUtterance *synUtt = [[AVSpeechUtterance alloc] initWithString:textString];
    [synUtt setRate:speechSpeed];
    [synUtt setVoice:[AVSpeechSynthesisVoice voiceWithLanguage:selectedVoice]];
    [synthesizer speakUtterance:synUtt];


//BELOW TO APPEAR AND AND DISAPPEAR

        [UIButton beginAnimations:nil context:nil];
        [UIButton setAnimationDuration:0.5];
        [UIButton setAnimationDelay:0.0];
        [UIButton setAnimationCurve:UIViewAnimationCurveEaseOut];
        _speakingScrollView.frame = CGRectMake(236, 675, _speakingScrollView.frame.size.width, _speakingScrollView.frame.size.height);
        [self.view bringSubviewToFront:_speakingScrollView];
        [UIView commitAnimations];

}

我似乎无法弄清楚如何解决这个问题？我见过苹果文档建议

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

但我无法锻炼如何在我的应用程序中实现这一点。

Answer 1

快速查看AVSpeechSynthesizer的文档会发现它有delegate属性。

您应该设置delegate并实施AVSpeechSynthesizerDelegate协议，以便您可以收到有关语音合成器事件的通知。

等事件

- (void)speechSynthesizer:(AVSpeechSynthesizer *)synthesizer
 didFinishSpeechUtterance:(AVSpeechUtterance *)utterance;

和

- (void)speechSynthesizer:(AVSpeechSynthesizer *)synthesizer
  didStartSpeechUtterance:(AVSpeechUtterance *)utterance;

对你来说最有意思，考虑到你想知道它何时开始和停止。还有一些事件可以被取消，暂停和继续，您可能还需要实现这些事件来隐藏和显示您的用户界面。

AVSpeechSynthesizer - 如果AVSpeechSynthesizer说话＆amp;如果已经停止说话

1 个答案: