iOS-文本转语音

- 文本转语音

iOS提供了一个类AVSpeechSynthesizer来实现文本到语音的功能, 即读出文字

直接上代码:

    AVSpeechSynthesizer *synthesizer = [[AVSpeechSynthesizer alloc] init];
    
    NSArray *speechStrings = @[@"Hello AV Foundation. How are you?",
                               @"我很好, 感谢!",
                               @"Are you excited about the book?",
                               @"是的, 我非常喜欢这本书.",
                               @"What's your favourite feature?",
                               @"我都很喜欢呢!",
                               @"It was great to speak with you!",
                               @"我也是, 祝你愉快"];
    
    NSArray *voices = @[[AVSpeechSynthesisVoice voiceWithLanguage:@"en-US"],
                        [AVSpeechSynthesisVoice voiceWithLanguage:@"zh-cn"]];
    
    
    for (int i = 0; i < speechStrings.count; i ++) {
        
        AVSpeechUtterance *utterance = [[AVSpeechUtterance alloc] initWithString:speechStrings[i]];
        
        utterance.voice              = voices[i % 2];   // 语言
        utterance.rate               = 0.4f;            // 播放语音的速度
        utterance.pitchMultiplier    = 0.8f;            // 音调
        utterance.postUtteranceDelay = 0.1f;            // 下一句间隔时间
        
        // 发音
        [synthesizer speakUtterance:utterance];
    }

- 设置音频会话类型

下面是常见音频会话分类

分类	作用	是否允许混音	音频输入	音频输出
Ambient	游戏, 效率应用程序	V		V
Solo Ambient(默认)	游戏, 效率应用程序			V
Playback	音频和视频播放器	可选		V
Record	录音机, 音频捕捉		V
Play and Record	VOIP, 语音聊天	可选	V	V
Audio Processing	离线会话和处理
Multi-Route	使用外部硬件的高级A/V应用程序		V	V

设置音频会话

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    
    AVAudioSession *session = [AVAudioSession sharedInstance];

    NSError *error;
    if (![session setCategory:AVAudioSessionCategoryPlayback error:&error]) {
        
        NSLog(@"Category Error: %@", [error localizedDescription]);
    }
    
    if (![session setActive:YES error:&error]) {
        
        NSLog(@"Activation Error: %@", [error localizedDescription]);
    }
    return YES;
}