如何让iOS推送播放语音？

@interface NotificationService ()

@property (nonatomic, strong) void (^contentHandler)(UNNotificationContent *contentToDeliver);
@property (nonatomic, strong) UNMutableNotificationContent *bestAttemptContent;

@end

@implementation NotificationService

- (void)didReceiveNotificationRequest:(UNNotificationRequest *)request withContentHandler:(void (^)(UNNotificationContent * _Nonnull))contentHandler {
    self.contentHandler = contentHandler;
    self.bestAttemptContent = [request.content mutableCopy];
    
    // Modify the notification content here...
    // 修改推送的标题
    //    self.bestAttemptContent.title = [NSString stringWithFormat:@"%@ [modified]", self.bestAttemptContent.title];
    
    // 修改推送的声音，自定义铃声支持的声音格式包括，aiff、wav以及wav格式，铃声的长度必须小于30s，否则系统会播放默认的铃声。
    //    self.bestAttemptContent.sound = [UNNotificationSound soundNamed:@"a.wav"];

    // 播放处理
    [self playVoiceWithInfo:self.bestAttemptContent.userInfo];
    
    self.contentHandler(self.bestAttemptContent);
}

- (void)serviceExtensionTimeWillExpire {
    // Called just before the extension will be terminated by the system.
    // Use this as an opportunity to deliver your "best attempt" at modified content, otherwise the original push payload will be used.
    self.contentHandler(self.bestAttemptContent);
}

- (void)playVoiceWithInfo:(NSDictionary *)userInfo {
    NSLog(@"NotificationExtension content : %@",userInfo);

    NSString *title = userInfo[@"aps"][@"alert"][@"title"];
    NSString *subTitle = userInfo[@"aps"][@"alert"][@"subtitle"];
    NSString *subMessage = userInfo[@"aps"][@"alert"][@"body"];
    NSString *isRead = userInfo[@"isRead"];
    NSString *isUseBaiDu = userInfo[@"isBaiDu"];

    [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback
                                     withOptions:AVAudioSessionCategoryOptionDuckOthers error:nil];
    [[AVAudioSession sharedInstance] setActive:YES
                                   withOptions:AVAudioSessionSetActiveOptionNotifyOthersOnDeactivation
                                         error:nil];

    // Ps: 下面代码示例并没有多条播放的处理，还请注意

    if ([isRead isEqual:@"1"]) {
        // 播放语音
        if ([isUseBaiDu isEqual:@"1"]) {
            // 使用百度离线语音播放
            [[BaiDuTtsUtils shared] playBaiDuTTSVoiceWithContent:title];
        }
        else {
            // 使用系统语音播放
            [[AppleTtsUtils shared] playAppleTTSVoiceWithContent:title];
        }
    }
    else {
        // 无需播放语音
    }

}

@end

#import "AppleTtsUtils.h"
#import <AVFoundation/AVFoundation.h>
#import <AVKit/AVKit.h>

@interface AppleTtsUtils ()<AVSpeechSynthesizerDelegate>

@property (nonatomic, strong) AVSpeechSynthesizer *speechSynthesizer;
@property (nonatomic, strong) AVSpeechSynthesisVoice *speechSynthesisVoice;

@end

@implementation AppleTtsUtils

+ (instancetype)shared {
    static id instance = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        instance = [[self class] new];
    });
    
    return instance;
}

- (BOOL)isNumber:(NSString *)str
{
   if (str.length == 0) {
        return NO;
    }
    NSString *regex = @"[0-9]*";
    NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];
    if ([pred evaluateWithObject:str]) {
        return YES;
    }
    return NO;
}

- (void)playAppleTtsVoiceWithContent:(NSString *)content {
    
    if ((content == nil) || (content.length <= 0)) {
        return;
    }
    // 数字转语音，采用zh-CN的voice后，数字的播放方式是几万几千几百几十几这种，故而采用数字后面拼接空格的方式来处理；遍历内容的每一个字符串，如果是数字，则拼接一个空格到后面，最后播放时数字就会一个个读出来。
    NSString *newResult = @"";
    for (int i = 0; i < content.length; i++) {
        NSString *tempStr = [content substringWithRange:NSMakeRange(i, 1)];
        newResult = [newResult stringByAppendingString:tempStr];
        if ([self deptNumInputShouldNumber:tempStr] ) {
            newResult = [newResult stringByAppendingString:@" "];
        }
    }
    // Todo: 英文转语音
    
    AVSpeechUtterance *utterance = [AVSpeechUtterance speechUtteranceWithString:newResult];
    utterance.rate = AVSpeechUtteranceDefaultSpeechRate;
    utterance.voice = self.speechSynthesisVoice;
    utterance.volume = 1.0;
    utterance.rate = AVSpeechUtteranceDefaultSpeechRate;
    [self.speechSynthesizer speakUtterance:utterance];
}

- (AVSpeechSynthesizer *)speechSynthesizer {
    if (!_speechSynthesizer) {
        _speechSynthesizer = [[AVSpeechSynthesizer alloc] init];
        _speechSynthesizer.delegate = self;
    }
    return _speechSynthesizer;
}

- (AVSpeechSynthesisVoice *)speechSynthesisVoice {
    if (!_speechSynthesisVoice) {
        _speechSynthesisVoice = [AVSpeechSynthesisVoice voiceWithLanguage:@"zh-CN"];
    }
    return _speechSynthesisVoice;
}


- (void)speechSynthesizer:(AVSpeechSynthesizer *)synthesizer didStartSpeechUtterance:(AVSpeechUtterance *)utterance {
    NSLog(@"didStartSpeechUtterance");
}

- (void)speechSynthesizer:(AVSpeechSynthesizer *)synthesizer didCancelSpeechUtterance:(AVSpeechUtterance *)utterance {
    NSLog(@"didCancelSpeechUtterance");
}

- (void)speechSynthesizer:(AVSpeechSynthesizer *)synthesizer didPauseSpeechUtterance:(AVSpeechUtterance *)utterance {
    NSLog(@"didPauseSpeechUtterance");
}

- (void)speechSynthesizer:(AVSpeechSynthesizer *)synthesizer didFinishSpeechUtterance:(AVSpeechUtterance *)utterance {
    NSLog(@"didFinishSpeechUtterance");
    [self.speechSynthesizer stopSpeakingAtBoundary:AVSpeechBoundaryWord];

//    // 每一条语音播放完成后，我们调用此代码，用来呼出通知栏
// 可通过Block回掉暴露给上层
//    self.contentHandler(self.bestAttemptContent);
}

![1618303510485.jpg](https://i.loli.net/2021/04/13/pWnS2qk9KOXoNR6.jpg)

![1618303458956.jpg](https://i.loli.net/2021/04/13/voO3fn1QsbMPIxh.jpg)

#import "BaiDuTtsUtils.h"
#import "BDSSpeechSynthesizer.h"

// 百度TTS
NSString* BaiDuTTSAPP_ID = @"Your_APP_ID";
NSString* BaiDuTTSAPI_KEY = @"Your_APP_KEY";
NSString* BaiDuTTSSECRET_KEY = @"Your_SECRET_KEY";
NSString* BaiDuTTSSN = @"Your_SN";

@interface BaiDuTtsUtils ()<BDSSpeechSynthesizerDelegate>

@end

@implementation BaiDuTtsUtils

+ (instancetype)shared {
    static id instance = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        instance = [[self class] new];
    });
    
    return instance;
}

#pragma mark - baidu tts

-(void)configureOfflineTTS{
    
    NSError *err = nil;
    NSString* offlineSpeechData = [[NSBundle mainBundle] pathForResource:@"bd_etts_common_speech_m15_mand_eng_high_am-mgc_v3.6.0_20190117" ofType:@"dat"];
    NSString* offlineTextData = [[NSBundle mainBundle] pathForResource:@"bd_etts_common_text_txt_all_mand_eng_middle_big_v3.4.2_20210319" ofType:@"dat"];
//    #error "set offline engine license"
    if (offlineSpeechData == nil || offlineTextData == nil) {
        NSLog(@"离线合成 资源文件为空！");
        return;
    }

    err = [[BDSSpeechSynthesizer sharedInstance] loadOfflineEngine:offlineTextData speechDataPath:offlineSpeechData licenseFilePath:nil withAppCode:BaiDuTTSAPP_ID withSn:BaiDuTTSSN];
    if(err){
        NSLog(@"Offline TTS init failed");
        return;
    }
}

- (void)playBaiDuTTSVoiceWithContent:(NSString *)voiceText {
    NSLog(@"TTS version info: %@", [BDSSpeechSynthesizer version]);
    
    [BDSSpeechSynthesizer setLogLevel:BDS_PUBLIC_LOG_VERBOSE];
    // 设置委托对象
    [[BDSSpeechSynthesizer sharedInstance] setSynthesizerDelegate:self];
    
    
    [self configureOfflineTTS];

    [[BDSSpeechSynthesizer sharedInstance] setPlayerVolume:10];
    [[BDSSpeechSynthesizer sharedInstance] setSynthParam:[NSNumber numberWithInteger:5] forKey:BDS_SYNTHESIZER_PARAM_SPEED];

    // 开始合成并播放
    NSError* speakError = nil;
    NSInteger sentenceID = [[BDSSpeechSynthesizer sharedInstance] speakSentence:voiceText withError:&speakError];
    if (speakError) {
        NSLog(@"错误: %ld, %@", (long)speakError.code, speakError.localizedDescription);
    }
}

- (void)synthesizerStartWorkingSentence:(NSInteger)SynthesizeSentence
{
    NSLog(@"Began synthesizing sentence %ld", (long)SynthesizeSentence);
}

- (void)synthesizerFinishWorkingSentence:(NSInteger)SynthesizeSentence
{
    NSLog(@"Finished synthesizing sentence %ld", (long)SynthesizeSentence);
}

- (void)synthesizerSpeechStartSentence:(NSInteger)SpeakSentence
{
    NSLog(@"Began playing sentence %ld", (long)SpeakSentence);
}

- (void)synthesizerSpeechEndSentence:(NSInteger)SpeakSentence
{
    NSLog(@"Finished playing sentence %ld", (long)SpeakSentence);
}


@end

{
  "aps": {
  "alert": {
      "title":"标题",
      "subtitle: "副标题",
      "body": "内容"
  },
  "badge": 1,
  "sound": "default",
  "mutable-content": "1",
  }
}

[AXTTSCommon] Failure starting audio queue alp! 
[AXTTSCommon] _BeginSpeaking: couldn't begin playback

[ERROR][AudioBufPlayer.mm:1088]AudioQueue start errored error: 561015905 (!pla)
[ERROR][AudioBufPlayer.mm:1099]Can't begin playback while in background!