要求语音转文字 从网上找到一些代码  自己改了一下留存  目前能满足我的要求 其他跟着改进

首先加入框架XCode8以上,只有它之后的编译器里才有Speech.framework

在info.plist文件中添加

Privacy - Speech Recognition Usage Description使用语音识别的

Privacy - Microphone Usage Description使用麦克风的

在需要的VC里

#import <Speech/Speech.h>

SFSpeechRecognizerDelegate代理

 

@property(nonatomic,strong)SFSpeechAudioBufferRecognitionRequest * recognitionRequest ;//语音请求对象

@property(nonatomic,strong)SFSpeechRecognitionTask * recognitionTask ;//当前语音识别进程

@property(nonatomic,strong)AVAudioEngine * audioEngine ;//声音处理器

@property(nonatomic,strong)SFSpeechRecognizer * recognizer ;//语音识别器

@property (nonatomic, strong) UIButton *startBtn;    // 启动按钮

我这里的是用textView 接收文字 

UITextView *ownTextView;// 自我介绍

UILabel *ownLabel;//textView 为空 这显示

    UILabel *numLabel;// 字数限制

在

viewDidLoad里

 //将设备识别语音为中文

    NSLocale *cale = [[NSLocale alloc]initWithLocaleIdentifier:@"zh-CN"];

    self.recognizer = [[SFSpeechRecognizer alloc]initWithLocale:cale];

    _startBtn.enabled = false;

    //设置代理

    self.recognizer.delegate = self;

    self.audioEngine = [[AVAudioEngine alloc]init];

在按钮方法里

- (void)BtnClick:(UIButton *)sender {

//语音识别

    [SFSpeechRecognizer requestAuthorization:^(SFSpeechRecognizerAuthorizationStatus status) {

        bool isButtonEnabled = false;

        switch (status) {

            case SFSpeechRecognizerAuthorizationStatusAuthorized:

                isButtonEnabled = true;

                NSLog(@"可以语音识别");

                break;

                            case SFSpeechRecognizerAuthorizationStatusRestricted:

                                isButtonEnabled = false;

                                NSLog(@"不能在该设备上进行语音识别");

                                break;

                            case SFSpeechRecognizerAuthorizationStatusNotDetermined:

                                isButtonEnabled = false;

                                NSLog(@"没有授权语音识别");

                                break;

            case SFSpeechRecognizerAuthorizationStatusDenied:

                isButtonEnabled = false;

                NSLog(@"用户被拒绝访问语音识别");

                UIAlertController * alert1 = [UIAlertController alertControllerWithTitle:@"打开麦克风和语音识别才能录音" message:@"请在设置中打开麦克和语音识别" preferredStyle:UIAlertControllerStyleAlert];

                UIAlertAction * ok =[UIAlertAction actionWithTitle:@"去设置中" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {

                    /*打开设置*/

                    NSURL * settingsURL = [NSURL URLWithString:UIApplicationOpenSettingsURLString];

                    [[UIApplication sharedApplication]openURL:settingsURL];

                }];

                UIAlertAction * cacel = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {

                    

                }];

                [alert1 addAction:ok];

                [alert1 addAction:cacel];

                [self presentViewController:alert1 animated:YES completion:nil];

                break;

 

//                break;

        }

        _startBtn.enabled = isButtonEnabled;

    }];

    

    if ([self.audioEngine isRunning]) {

        numLabel.text = [NSString stringWithFormat:@"%lu/200字",(unsigned long)ownTextView.text.length];

            if (ownTextView.text.length == 0) {

                ownLabel.hidden = NO;

                

            }

        [self.audioEngine stop];

        [self.recognitionRequest endAudio];

        _startBtn.enabled = YES;

        [_startBtn setTitle:@"开始录制" forState:UIControlStateNormal];

    }else{

        

        ownLabel.hidden = YES;

        [self startRecording];

        [_startBtn setTitle:@"停止录制" forState:UIControlStateNormal];

    }

}

 

- (void)startRecording{

    if (self.recognitionTask) {

        [self.recognitionTask cancel];

        self.recognitionTask = nil;

    }

    

    AVAudioSession *audioSession = [AVAudioSession sharedInstance];

    bool  audioBool = [audioSession setCategory:AVAudioSessionCategoryRecord error:nil];

    bool  audioBool1= [audioSession setMode:AVAudioSessionModeMeasurement error:nil];

    bool  audioBool2= [audioSession setActive:true withOptions:AVAudioSessionSetActiveOptionNotifyOthersOnDeactivation error:nil];

    if (audioBool || audioBool1||  audioBool2) {

        NSLog(@"可以使用");

    }else{

        NSLog(@"这里说明有的功能不支持");

    }

    self.recognitionRequest = [[SFSpeechAudioBufferRecognitionRequest alloc]init];

    AVAudioInputNode *inputNode = self.audioEngine.inputNode;

    

    self.recognitionRequest.shouldReportPartialResults = true;

    

    //开始识别任务

    self.recognitionTask = [self.recognizer recognitionTaskWithRequest:self.recognitionRequest resultHandler:^(SFSpeechRecognitionResult * _Nullable result, NSError * _Nullable error) {

        bool isFinal = false;

        if (result) {

            ownTextView.text = [[result bestTranscription] formattedString]; //语音转文本

            numLabel.text = [NSString stringWithFormat:@"%lu/200字",(unsigned long)ownTextView.text.length];

                    if (ownTextView.text.length >=200) {

            

                        ownTextView.text = [ownTextView.text substringToIndex:200];

                        numLabel.text = @"200/200字";

                        [[SMProgressHUD shareInstancetype]showErrorTip:@"最对输入200字"];

                     }

 

            isFinal = [result isFinal];

        }

        if (error || isFinal) {

            [self.audioEngine stop];

            [inputNode removeTapOnBus:0];

            self.recognitionRequest = nil;

            self.recognitionTask = nil;

            _startBtn.enabled = true;

        }

    }];

    AVAudioFormat *recordingFormat = [inputNode outputFormatForBus:0];

    [inputNode installTapOnBus:0 bufferSize:1024 format:recordingFormat block:^(AVAudioPCMBuffer * _Nonnull buffer, AVAudioTime * _Nonnull when) {

        [self.recognitionRequest appendAudioPCMBuffer:buffer];

    }];

    [self.audioEngine prepare];

    bool audioEngineBool = [self.audioEngine startAndReturnError:nil];

    NSLog(@"%d",audioEngineBool);

    ownTextView.text = @"";

     numLabel.text = [NSString stringWithFormat:@"%lu/200字",(unsigned long)ownTextView.text.length];

}

  到这里 就完成了 语音转文字  布局自己合适写