目标C：等待AVSpeechSynthesizer，直到它说完一个单词

Question

我需要禁用与用户的互动，直到应用完成发言。请参阅下面的示例代码：

self.view.userInteractionEnabled = NO;
[self speak :@"wait for me to speak"];
self.view.userInteractionEnabled = YES;

-(void)speak:(NSString*)word
{
    AVSpeechUtterance *utterance = [[AVSpeechUtterance alloc] initWithString:word];
    utterance.rate = AVSpeechUtteranceMinimumSpeechRate;
    utterance.rate = 0.2f;
    utterance.voice = [AVSpeechSynthesisVoice voiceWithLanguage
    [AVSpeechSynthesisVoice currentLanguageCode]];
    [synthesizer speakUtterance:utterance];
}

Answer 1

使用委托（AVSpeechSynthesizerDelegate）。它告诉您演讲何时结束，现在再次启用用户交互。