AVSpeechSynthesizer 和 AirPlay — 音频设备休眠？

Question

如果我使用 AVSpeechSynthesizer 说出一些文本，它在设备上可以正常工作，但是一旦我使用 AirPlay，语音的开头就会被切断，除非之前刚说了些什么。

看来音频设备要休眠了。

下面是我的代码

let synthesizer = AVSpeechSynthesizer()

func speakCall(call: (letter: String, number: Int)) -> Void {
    for  _ in 1...2 { // Speak the message twice
        let utterance = AVSpeechUtterance(string: "\(call.letter), \(call.number)")
        utterance.postUtteranceDelay = 0.15
        synthesizer.speakUtterance(utterance)
    }
}

Answer 1

可以让AVAudioPlayer静音播放，这样会导致音频设备不休眠

let silence = NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("silence", ofType: "mp3")!)
var silencePlayer: AVAudioPlayer?
try? silencePlayer = AVAudioPlayer(contentsOfURL: silence)
silencePlayer?.numberOfLoops = -1
silencePlayer?.play()

AVSpeechSynthesizer 和 AirPlay — 音频设备休眠？

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