后台模式下的 AVSpeechSynthesizer [英] AVSpeechSynthesizer in background mode

问题描述

当我的 iOS 应用程序处于后台模式时，我无法让 iOS 7 AVSpeechSynthesizer 工作.我在应用支持的后台模式中添加了应用播放音频"键，但我仍然无法让它工作.

I can't get the iOS 7 AVSpeechSynthesizer to work when my iOS app is in background mode. I have added the "App plays audio" key to the app's supported background modes, but I still can't get it to work.

我还研究了使用 AVSpeechSynthesizer 语句创建 AVMutableCompositionTrack 的可能性，然后以某种方式与能够在后台运行的播放器一起播放- 但没有运气.

I have also investigated the possibility of creating an AVMutableCompositionTrack, with an AVSpeechSynthesizer utterance, and then somehow play it with a player that would be able to run in the background - but with no luck.

在后台使用 AVSpeechSynthesizer 时，有没有人比我运气好?

Did anyone have better luck than me in using AVSpeechSynthesizer in the background?

推荐答案

1. 您必须在后台模式中设置音频和 AirPlay".
2. 您必须配置音频会话:

    NSError *error = NULL;
    AVAudioSession *session = [AVAudioSession sharedInstance];
    [session setCategory:AVAudioSessionCategoryPlayback error:&error];
    if(error) {
        // Do some error handling
    }
    [session setActive:YES error:&error];
    if (error) {
        // Do some error handling
    }

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