原理： 先用系统的录音器录音，让后让siri识别语音转文字

第一步 ：在项目plist文件添加授权，如下图

第二步：导入头文件，添加协议，

#import <Speech/Speech.h>

#import <AVFoundation/AVFoundation.h>

@interface SiriViewController () <SFSpeechRecognizerDelegate>

第三步：UI控件，实现siri识别方法，代码如下：

 .h

#import <UIKit/UIKit.h>@interface SiriViewController : UIViewController@end

.m

//
//  SiriViewController.m
//  ASR
//
//  Created by 刘成利 on 2017/2/28.
//  Copyright © 2017年 刘成利. All rights reserved.
//
#define sWith     [UIScreen mainScreen].bounds.size.width
#define sHeight   [UIScreen mainScreen].bounds.size.height#import "SiriViewController.h"#import <Speech/Speech.h>
#import <AVFoundation/AVFoundation.h>#import "LongPressButton.h"@interface SiriViewController () <SFSpeechRecognizerDelegate>@property (nonatomic, strong) LongPressButton *longButton;    // 长按按钮
@property (nonatomic, strong) UITextField     *inputText;     // 语音转化成的文本// 录音引擎
@property (strong, nonatomic) AVAudioEngine            *audioEngine;
// 语音识别任务
@property (strong, nonatomic) SFSpeechRecognitionTask  *recognitionTask;
// 语音识别器
@property (strong, nonatomic) SFSpeechRecognizer       *speechRecognizer;
// 识别请求
@property (strong, nonatomic) SFSpeechAudioBufferRecognitionRequest *recognitionRequest;@end@implementation SiriViewController- (void)viewDidLoad {[super viewDidLoad];self.view.backgroundColor = [UIColor whiteColor];// 创建信息labelUILabel *textLabel      = [[UILabel alloc] initWithFrame:CGRectMake(50, 50, sWith-100, 30)];textLabel.text          = @"【Siri】语音识别转文字";textLabel.font          = [UIFont fontWithName:@"HelveticaNeue" size:20.f];textLabel.textColor     = [UIColor blackColor];textLabel.textAlignment = NSTextAlignmentCenter;[self.view addSubview:textLabel];// 退出控制器{UIButton *dismissButton        = [[UIButton alloc] initWithFrame:CGRectMake(sWith/2-50, sHeight-100, 100, 50)];dismissButton.tag              = 10;dismissButton.backgroundColor  = [UIColor lightGrayColor];dismissButton.titleLabel.font  = [UIFont fontWithName:@"HelveticaNeue" size:16.f];[dismissButton setTitle:@"返回上一页" forState:UIControlStateNormal];[dismissButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];[dismissButton setTitleColor:[UIColor grayColor] forState:UIControlStateHighlighted];[dismissButton addTarget:self action:@selector(dismiss) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:dismissButton];}// 语音识别self.inputText = [[UITextField alloc]initWithFrame:CGRectMake(50, 200, sWith-100, 100)];self.inputText.backgroundColor = [[UIColor blackColor]colorWithAlphaComponent:0.2];[self.view addSubview:self.inputText];// 长按按钮self.longButton = [[LongPressButton alloc]initWithFrame:CGRectMake(sWith/2-50, sHeight-300, sWith-300, sWith-300)];self.longButton.removeLoading = YES;// 保持在视图最上面[[UIApplication sharedApplication].keyWindow addSubview:self.longButton];[[UIApplication sharedApplication].keyWindow bringSubviewToFront:self.longButton];__weak SiriViewController *weakSelf = self;self.longButton.eventBlock = ^(TouchType TouchType,NSTimeInterval time){switch (TouchType) {case LongTouchBegin:[weakSelf startEvent];break;case LongTouchEnd:[weakSelf endEvent];break;default:break;}};// 基本设置[self basicSetup];}- (void)basicSetup{// 设备识别语言为中文NSLocale *cale = [[NSLocale alloc]initWithLocaleIdentifier:@"zh-CN"];self.speechRecognizer = [[SFSpeechRecognizer alloc]initWithLocale:cale];// 申请权限认证[SFSpeechRecognizer requestAuthorization:^(SFSpeechRecognizerAuthorizationStatus status) {dispatch_async(dispatch_get_main_queue(), ^{switch (status) {case SFSpeechRecognizerAuthorizationStatusNotDetermined:self.longButton.userInteractionEnabled = NO;self.inputText.text  = @"没有授权语音识别";break;case SFSpeechRecognizerAuthorizationStatusDenied:self.longButton.userInteractionEnabled = NO;self.inputText.text   = @"用户拒绝使用语音识别权限";break;case SFSpeechRecognizerAuthorizationStatusRestricted:self.longButton.userInteractionEnabled = NO;self.inputText.text   = @"不能在该设备上进行语音识别";break;case SFSpeechRecognizerAuthorizationStatusAuthorized:self.longButton.userInteractionEnabled = YES;self.inputText.text   = @"设备录音可用";break;default:break;}});}];// 创建录音引擎self.audioEngine = [[AVAudioEngine alloc]init];}// 语音按钮识别事件
- (void)endEvent{if ([self.audioEngine isRunning]) {[self.audioEngine stop];[self.recognitionRequest endAudio];}[self.longButton finishAndRest];}// 识别语音
-(void)startEvent{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.speechRecognizer recognitionTaskWithRequest:self.recognitionRequest resultHandler:^(SFSpeechRecognitionResult * _Nullable result, NSError * _Nullable error) {bool isFinal = false;if (result) {self.inputText.text = [[result bestTranscription] formattedString]; //语音转文本isFinal = [result isFinal];}if (error || isFinal) {[self.audioEngine stop];[inputNode removeTapOnBus:0];self.recognitionRequest = nil;self.recognitionTask = nil;
//            self.siriButton.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);
//    self.inputText.text = @"正在录音。。。";
}#pragma mark - SFSpeechRecognizerDelegate
- (void)speechRecognizer:(SFSpeechRecognizer *)speechRecognizer availabilityDidChange:(BOOL)available{if (available) {self.inputText.text = @"语音识别可用";}else{self.inputText.text = @"语音识别不可用";}
}// 退出控制器
- (void)dismiss{[self dismissViewControllerAnimated:YES completion:^{}];}