AVSpeechSynthesizer可在模拟器上运行,但不在设备上运行

Question

我一直在努力学习AVSpeechSynthesis.代码在iOS模拟器中运行良好(在iPad和iOS上都可以),但是文本到语音功能在我的iPad上根本不起作用.这是我的代码.

    - (void)viewDidLoad
{

[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.



//Load Model
    self.string = @"Hello World";
    self.utterance = [[AVSpeechUtterance alloc] initWithString:self.string];
    self.utterance.voice = [AVSpeechSynthesisVoice voiceWithLanguage:@"en-US"];
    self.utterance.rate = (float) 0.25;

    //Load UI
    self.textLabel.text = self.string;


}

- (IBAction)startSpeaking:(id)sender {

    self.speechSynthesizer = [[AVSpeechSynthesizer alloc] init];

    if ([self.speechSynthesizer isSpeaking]) {

        [self.speechSynthesizer pauseSpeakingAtBoundary:AVSpeechBoundaryWord];


    } else {

        [self.speechSynthesizer speakUtterance:self.utterance];

    }    
}

更新:AVSpeechSyntheSizer工作但没有声音 所以我有一个UILabel与UI上的AVSpeechUtterance相同的文本.我实现了AVSpeechSynthesizerDelegate,这样当我点击startSpeaking时:文本标签将当前单词变为红色.所以我知道AVSpeechSynthesizer必须工作,因为它正在进行委托调用,但我无法弄清楚为什么我听不到它.音量上升,没有其他应用播放音频.

Answer 1

你有手机处于静音模式吗？这也使合成器静音.