本文将带你了解IOS开发入门iOS语音书写功能（语音转文本），希望本文对大家学IOS有所帮助。

Demo下载地址

最近在项目开发中，需要将语音识别转换成文本的功能。研究了下科大讯飞，附上Demo分享给大家。

研发前先得做一些准备。

1、注册科大讯飞开发者帐号（//www.xfyun.cn）

2、下载开发平台（iOS、或Android，或其他）所需要的SDK（SDK包含：说明文档、SDK即iflyMSC.framework、Demo）

3、项目中添加SDK（添加时，先将SDK复制粘贴到项目文件，再通过addframe的方法添加到项目引用），及相关联的framework

添加方法：TARGETS-Build Phases-Link Binary With Libraries-"+"-Choose frameworks and libraries to add-add other，或选择对应的framework-add

4、使用时要添加对应的头文件

特别说明：

1、使用SDK关联的APPID存在于下载的Demo中，如果SDK有替换的话APPID应该跟着一起替换。

2、添加其他framework：

libz.tbd

libc++.tbd

CoreGraphics.framework

QuartzCore.framework

AddressBook.framework

CoreLocation.framework

UIKit.framework

AudioToolbox.framework

Foundation.framework

SystemConfiguration.framework

AVFoundation.framework

CoreTelephoney.framework

3、Bitcode属性设置为NO（TARGETS-Build Settings-Build Options-Enable Bitcode-NO）

4、在使用前，务必在AppDelegate的方法中"

- (BOOL)application:(UIApplication*)application didFinishLaunchingWithOptions:(NSDictionary*)launchOptions {}"进行初始化操作。

5、需要有网络的情况下才能使用。

如图

下载的科大讯飞SDK文件

Demo中的APPID

添加SDK，及添加关联framework

设置Bitcode属性为 NO

语音转文件实现代码

.h文件

#import

//导入头文件

#import"iflyMSC.framework/Headers/IFlyMSC.h"

#import"iflyMSC.framework/Headers/IFlySpeechUtility.h"

#import"iflyMSC/IFlySpeechConstant.h"

#pragmamark-初始化参数类

/**************************************************************************/

@interfaceIATConfig:NSObject

+(IATConfig*)sharedInstance;

+(NSString*)mandarin;

+(NSString*)cantonese;

+(NSString*)henanese;

+(NSString*)chinese;

+(NSString*)english;

+(NSString*)lowSampleRate;

+(NSString*)highSampleRate;

+(NSString*)isDot;

+(NSString*)noDot;

/**

以下参数，需要通过iFlySpeechRecgonizer进行设置

*/

@property(nonatomic,strong)NSString*speechTimeout;

@property(nonatomic,strong)NSString*vadEos;

@property(nonatomic,strong)NSString*vadBos;

@property(nonatomic,strong)NSString*language;

@property(nonatomic,strong)NSString*accent;

@property(nonatomic,strong)NSString*dot;

@property(nonatomic,strong)NSString*sampleRate;

/**

以下参数无需设置不必关

*/

@property(nonatomic,assign)BOOLhaveView;

@property(nonatomic,strong)NSArray*accentIdentifer;

@property(nonatomic,strong)NSArray*accentNickName;

@end

/**************************************************************************/

#pragmamark-语音听写类

@interfaceVoiceConversion:NSObject

///启动初始化语音程序

+(void)VoiceInitialize;

///开始录音

-(void)voiceStart:(void(^)(BOOLisStart))startListening

speechBegin:(void(^)(void))begin

speechEnd:(void(^)(void))end

speechError:(void(^)(BOOLisSuccess))error

speechResult:(void(^)(NSString*text))result

speechVolume:(void(^)(intvolume))volume;

///取消录音

-(void)voiceCancel;

///停止录音

-(void)voiceStop;

@end

.m文件

#import"VoiceConversion.h"

#pragmamark-初始化参数类

/**************************************************************************/

staticNSString*constPUTONGHUA=@"mandarin";

staticNSString*constYUEYU=@"cantonese";

staticNSString*constHENANHUA=@"henanese";

staticNSString*constENGLISH=@"en_us";

staticNSString*constCHINESE=@"zh_cn";

@implementationIATConfig

-(id)init

{

self=[superinit];

if(self)

{

[selfdefaultSetting];

returnself;

}

returnnil;

}

+(IATConfig*)sharedInstance

{

staticIATConfig*instance=nil;

staticdispatch_once_tpredict;

dispatch_once(&predict,^{

instance=[[IATConfigalloc]init];

});

returninstance;

}

-(void)defaultSetting

{

_speechTimeout=@"30000";

_vadEos=@"3000";

_vadBos=@"3000";

_dot=@"1";

_sampleRate=@"16000";

_language=CHINESE;

_accent=PUTONGHUA;

_haveView=NO;//默认是不dai界面的

_accentNickName=[[NSArrayalloc]initWithObjects:@"粤语",@"普通话",@"河南话",@"英文",nil];

}

+(NSString*)mandarin

{

returnPUTONGHUA;

}

+(NSString*)cantonese

{

returnYUEYU;

}

+(NSString*)henanese

{

returnHENANHUA;

}

+(NSString*)chinese

{

returnCHINESE;

}

+(NSString*)english

{

returnENGLISH;

}

+(NSString*)lowSampleRate

{

return@"8000";

}

+(NSString*)highSampleRate

{

return@"16000";

}

+(NSString*)isDot

{

return@"1";

}

+(NSString*)noDot

{

return@"0";

}

@end

/**************************************************************************/

#pragmamark-语音听写类

staticNSString*constVoiceAPPID=@"572016e4";

staticNSString*constVoiceTimeOut=@"20000";

@interfaceVoiceConversion()

@property(nonatomic,strong)NSMutableString*resultText;

@property(nonatomic,strong)IFlySpeechRecognizer*iFlySpeechRecognizer;

@property(nonatomic,copy)void(^beginSpeech)(void);

@property(nonatomic,copy)void(^endSpeech)(void);

@property(nonatomic,copy)void(^errorSpeech)(BOOLisSuccess);

@property(nonatomic,copy)void(^resultSpeech)(NSString*text);

@property(nonatomic,copy)void(^volumeSpeech)(intvolume);

@end

@implementationVoiceConversion

#pragmamark初始化------------

///启动初始化语音程序

+(void)VoiceInitialize

{

//设置sdk的log等级，log保存在下面设置的工作路径中

[IFlySettingsetLogFile:LVL_ALL];

//打开输出在console的log开关

[IFlySettingshowLogcat:YES];

//设置sdk的工作路径

NSArray*paths=NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask,YES);

NSString*cachePath=[pathsobjectAtIndex:0];

[IFlySettingsetLogFilePath:cachePath];

//Appid是应用的身份信息,具有唯一性,初始化时必须要传入Appid。初始化是一个异步过程,可放在App启动时执行初始化,具体代码可以参照Demo的MSCAppDelegate.m。未初始化时使用服务,一般会返回错误码10111.

NSString*initString=[[NSStringalloc]initWithFormat:@"appid=%@",VoiceAPPID];

[IFlySpeechUtilitycreateUtility:initString];

}

#pragmamark实例化------------

-(void)dealloc

{

[selfvoiceCancel];

}

-(NSMutableString*)resultText

{

if(!_resultText)

{

_resultText=[[NSMutableStringalloc]init];

}

return_resultText;

}

-(IFlySpeechRecognizer*)iFlySpeechRecognizer

{

if(_iFlySpeechRecognizer==nil)

{

_iFlySpeechRecognizer=[IFlySpeechRecognizersharedInstance];

[_iFlySpeechRecognizersetParameter:@""forKey:[IFlySpeechConstantPARAMS]];

//设置听写模式

[_iFlySpeechRecognizersetParameter:@"iat"forKey:[IFlySpeechConstantIFLY_DOMAIN]];

}

return_iFlySpeechRecognizer;

}

-(void)initializeVoice

{

self.iFlySpeechRecognizer.delegate=self;

IATConfig*instance=[IATConfigsharedInstance];

//设置最长录音时间

[self.iFlySpeechRecognizersetParameter:instance.speechTimeoutforKey:[IFlySpeechConstantSPEECH_TIMEOUT]];

//设置后端点

[self.iFlySpeechRecognizersetParameter:instance.vadEosforKey:[IFlySpeechConstantVAD_EOS]];

//设置前端点

[self.iFlySpeechRecognizersetParameter:instance.vadBosforKey:[IFlySpeechConstantVAD_BOS]];

//网络等待时间

[self.iFlySpeechRecognizersetParameter:@"20000"forKey:[IFlySpeechConstantNET_TIMEOUT]];

//设置采样率，推荐使用16K

[self.iFlySpeechRecognizersetParameter:instance.sampleRateforKey:[IFlySpeechConstantSAMPLE_RATE]];

if([instance.languageisEqualToString:[IATConfigchinese]])

{

//设置语言

[self.iFlySpeechRecognizersetParameter:instance.languageforKey:[IFlySpeechConstantLANGUAGE]];

//设置方言

[self.iFlySpeechRecognizersetParameter:instance.accentforKey:[IFlySpeechConstantACCENT]];

}

elseif([instance.languageisEqualToString:[IATConfigenglish]])

{

[self.iFlySpeechRecognizersetParameter:instance.languageforKey:[IFlySpeechConstantLANGUAGE]];

}

//设置是否返回标点符号

[self.iFlySpeechRecognizersetParameter:instance.dotforKey:[IFlySpeechConstantASR_PTT]];

}

#pragmamark语音听写方法------------

///开始录音

-(void)voiceStart:(void(^)(BOOLisStart))startListening

speechBegin:(void(^)(void))begin

speechEnd:(void(^)(void))end

speechError:(void(^)(BOOLisSuccess))error

speechResult:(void(^)(NSString*text))result

speechVolume:(void(^)(intvolume))volume

{

[self.resultTextsetString:@""];

//回调设置

self.beginSpeech=[begincopy];

self.endSpeech=[endcopy];

self.errorSpeech=[errorcopy];

self.resultSpeech=[resultcopy];

self.volumeSpeech=[volumecopy];

//初始化设置

[selfinitializeVoice];

[self.iFlySpeechRecognizercancel];

//设置音频来源为麦克风

[self.iFlySpeechRecognizersetParameter:IFLY_AUDIO_SOURCE_MICforKey:@"audio_source"];

//设置听写结果格式为json

[self.iFlySpeechRecognizersetParameter:@"json"forKey:[IFlySpeechConstantRESULT_TYPE]];

//保存录音文件，保存在sdk工作路径中，如未设置工作路径，则默认保存在library/cache下

[self.iFlySpeechRecognizersetParameter:@"asr.pcm"forKey:[IFlySpeechConstantASR_AUDIO_PATH]];

BOOLisStart=[self.iFlySpeechRecognizerstartListening];

if(startListening)

{

//如果开始录音失败，可能是上次请求未结束，暂不支持多路并发

startListening(isStart);

}

}

///取消听写

-(void)voiceCancel

{

[self.iFlySpeechRecognizercancel];

}

///停止录音

-(void)voiceStop

{

[self.iFlySpeechRecognizerstopListening];

}

#pragmamarkIFlySpeechRecognizerDelegate------------

/**

识别结果返回代理

@param:results识别结果

@param:isLast表示是否最后一次结果

*/

-(void)onResults:(NSArray*)resultsisLast:(BOOL)isLast

{

NSMutableString*resultString=[[NSMutableStringalloc]init];

NSDictionary*dic=results[0];

for(NSString*keyindic)

{

[resultStringappendFormat:@"%@",key];

}

NSString*resultFromJson=[[selfclass]stringFromJson:resultString];

NSString*resultTextTemp=[NSStringstringWithFormat:@"%@%@",self.resultText,resultFromJson];

[self.resultTextsetString:resultTextTemp];

if(isLast)

{

if(self.resultSpeech)

{

//去掉最后一个句号

NSRangerange=[self.resultTextrangeOfString:@"。"options:NSBackwardsSearch];

if(range.location!=NSNotFound)

{

resultTextTemp=[self.resultTextsubstringToIndex:range.location];

[self.resultTextsetString:resultTextTemp];

}

self.resultSpeech(self.resultText);

}

}

[selfvoiceCancel];

}

/**

识别会话结束返回代理

@paramerror错误码,error.errorCode=0表示正常结束,非0表示发生错误。

*/

-(void)onError:(IFlySpeechError*)error

{

if(self.errorSpeech)

{

BOOLisSuccess=(0==error.errorCode);

self.errorSpeech(isSuccess);

}

}

/**

停止录音回调

*/

-(void)onEndOfSpeech

{

if(self.endSpeech)

{

self.endSpeech();

}

}

/**

开始识别回调

*/

-(void)onBeginOfSpeech

{

if(self.beginSpeech)

{

self.beginSpeech();

}

}

/**

音量回调函数volume0-30

*/

-(void)onVolumeChanged:(int)volume

{

if(self.volumeSpeech)

{

self.volumeSpeech(volume);

}

}

#pragmamark解析方法------------

/**************************************************************************/

/**

解析命令词返回的结果

*/

+(NSString*)stringFromAsr:(NSString*)params;

{

NSMutableString*resultString=[[NSMutableStringalloc]init];

NSString*inputString=nil;

NSArray*array=[paramscomponentsSeparatedByString:@"\n"];

for(intindex=0;index<array.count;index++)

 {

NSRangerange;

NSString*line=[arrayobjectAtIndex:index];

NSRangeidRange=[linerangeOfString:@"id="];

NSRangenameRange=[linerangeOfString:@"name="];

NSRangeconfidenceRange=[linerangeOfString:@"confidence="];

NSRangegrammarRange=[linerangeOfString:@"grammar="];

NSRangeinputRange=[linerangeOfString:@"input="];

if(confidenceRange.length==0||grammarRange.length==0||inputRange.length==0)

{

continue;

}

//checknomatch

if(idRange.length!=0)

{

NSUIntegeridPosX=idRange.location+idRange.length;

NSUIntegeridLength=nameRange.location-idPosX;

range=NSMakeRange(idPosX,idLength);

NSString*subString=[linesubstringWithRange:range];

NSCharacterSet*subSet=[NSCharacterSetwhitespaceAndNewlineCharacterSet];

NSString*idValue=[subStringstringByTrimmingCharactersInSet:subSet];

if([idValueisEqualToString:@"nomatch"])

{

return@"";

}

}

//GetConfidenceValue

NSUIntegerconfidencePosX=confidenceRange.location+confidenceRange.length;

NSUIntegerconfidenceLength=grammarRange.location-confidencePosX;

range=NSMakeRange(confidencePosX,confidenceLength);

NSString*score=[linesubstringWithRange:range];

NSUIntegerinputStringPosX=inputRange.location+inputRange.length;

NSUIntegerinputStringLength=line.length-inputStringPosX;

range=NSMakeRange(inputStringPosX,inputStringLength);

inputString=[linesubstringWithRange:range];

[resultStringappendFormat:@"%@置信度%@\n",inputString,score];

}

returnresultString;

}

/**

解析听写json格式的数据

params例如：

{"sn":1,"ls":true,"bg":0,"ed":0,"ws":[{"bg":0,"cw":[{"w":"白日","sc":0}]},{"bg":0,"cw":[{"w":"依山","sc":0}]},{"bg":0,"cw":[{"w":"尽","sc":0}]},{"bg":0,"cw":[{"w":"黄河入海流","sc":0}]},{"bg":0,"cw":[{"w":"。","sc":0}]}]}

*/

+(NSString*)stringFromJson:(NSString*)params

{

if(params==NULL)

{

returnnil;

}

NSMutableString*tempStr=[[NSMutableStringalloc]init];

//返回的格式必须为utf8的,否则发生未知错误

NSData*dataJSON=[paramsdataUsingEncoding:NSUTF8StringEncoding];

NSDictionary*resultDic=[NSJSONSerializationJSONObjectWithData:dataJSONoptions:kNilOptionserror:nil];

if(resultDic!=nil)

{

NSArray*wordArray=[resultDicobjectForKey:@"ws"];

for(inti=0;i<[wordArraycount];i++)

{

NSDictionary*wsDic=[wordArrayobjectAtIndex:i];

NSArray*cwArray=[wsDicobjectForKey:@"cw"];

for(intj=0;j<[cwArraycount];j++)

{

NSDictionary*wDic=[cwArrayobjectAtIndex:j];

NSString*str=[wDicobjectForKey:@"w"];

[tempStrappendString:str];

}

}

}

returntempStr;

}

/**

解析语法识别返回的结果

*/

+(NSString*)stringFromABNFJson:(NSString*)params

{

if(params==NULL)

{

returnnil;

}

NSMutableString*tempStr=[[NSMutableStringalloc]init];

NSData*dataJSON=[paramsdataUsingEncoding:NSUTF8StringEncoding];

NSDictionary*resultDic=[NSJSONSerializationJSONObjectWithData:dataJSONoptions:kNilOptionserror:nil];

NSArray*wordArray=[resultDicobjectForKey:@"ws"];

for(inti=0;i<[wordArraycount];i++)

{

NSDictionary*wsDic=[wordArrayobjectAtIndex:i];

NSArray*cwArray=[wsDicobjectForKey:@"cw"];

for(intj=0;j<[cwArraycount];j++)

{

NSDictionary*wDic=[cwArrayobjectAtIndex:j];

NSString*str=[wDicobjectForKey:@"w"];

NSString*score=[wDicobjectForKey:@"sc"];

[tempStrappendString:str];

[tempStrappendFormat:@"置信度:%@",score];

[tempStrappendString:@"\n"];

}

}

returntempStr;

}

/**************************************************************************/

@end

使用

初始化方法

///启动初始化语音程序

+(void)VoiceInitialize

{

//设置sdk的log等级，log保存在下面设置的工作路径中

[IFlySettingsetLogFile:LVL_ALL];

//打开输出在console的log开关

[IFlySettingshowLogcat:YES];

//设置sdk的工作路径

NSArray*paths=NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask,YES);

NSString*cachePath=[pathsobjectAtIndex:0];

[IFlySettingsetLogFilePath:cachePath];

//Appid是应用的身份信息,具有唯一性,初始化时必须要传入Appid。初始化是一个异步过程,可放在App启动时执行初始化,具体代码可以参照Demo的MSCAppDelegate.m。未初始化时使用服务,一般会返回错误码10111.

NSString*initString=[[NSStringalloc]initWithFormat:@"appid=%@",VoiceAPPID];

[IFlySpeechUtilitycreateUtility:initString];

}

初始化调用

-(BOOL)application:(UIApplication*)applicationdidFinishLaunchingWithOptions:(NSDictionary*)launchOptions

{

//Overridepointforcustomizationafterapplicationlaunch.

[VoiceConversionVoiceInitialize];

returnYES;

}

#import"VoiceConversion.h"

@interfaceViewController()

@property(nonatomic,strong)VoiceConversion*voiceConversion;

@property(nonatomic,strong)UILabel*messageLabel;

@end

@implementationViewController

-(void)viewDidLoad{

[superviewDidLoad];

//Doanyadditionalsetupafterloadingtheview,typicallyfromanib.

UIBarButtonItem*startItem=[[UIBarButtonItemalloc]initWithTitle:@"start"style:UIBarButtonItemStyleDonetarget:selfaction:@selector(startItemClick:)];

UIBarButtonItem*stopItem=[[UIBarButtonItemalloc]initWithTitle:@"stop"style:UIBarButtonItemStyleDonetarget:selfaction:@selector(stopItemClick:)];

UIBarButtonItem*cancelItem=[[UIBarButtonItemalloc]initWithTitle:@"cancel"style:UIBarButtonItemStyleDonetarget:selfaction:@selector(cancelItemClick:)];

self.navigationItem.rightBarButtonItems=@[startItem,stopItem,cancelItem];

self.title=@"科大讯飞语音";

[selfsetUI];

}

-(void)didReceiveMemoryWarning{

[superdidReceiveMemoryWarning];

//Disposeofanyresourcesthatcanberecreated.

}

#pragmamark-视图

-(void)setUI

{

if([selfrespondsToSelector:@selector(setEdgesForExtendedLayout:)])

{

[selfsetEdgesForExtendedLayout:UIRectEdgeNone];

}

self.messageLabel=[[UILabelalloc]initWithFrame:CGRectMake(10.0,10.0,CGRectGetWidth(self.view.bounds)-10.0*2,40.0)];

[self.viewaddSubview:self.messageLabel];

self.messageLabel.backgroundColor=[UIColorcolorWithWhite:0.5alpha:0.3];

self.messageLabel.textAlignment=NSTextAlignmentCenter;

}

#pragmamark-响应

-(void)startItemClick:(UIBarButtonItem*)item

{

ViewController__weak*weakSelf=self;

[self.voiceConversionvoiceStart:^(BOOLisStart){

NSLog(@"1start");

if(isStart)

{

weakSelf.messageLabel.text=@"正在录音";

}

else

{

weakSelf.messageLabel.text=@"启动识别服务失败，请稍后重试";

}

}speechBegin:^{

NSLog(@"2begin");

}speechEnd:^{

NSLog(@"3end");

}speechError:^(BOOLisSuccess){

NSLog(@"4error");

}speechResult:^(NSString*text){

NSLog(@"5result");

weakSelf.messageLabel.text=text;

}speechVolume:^(intvolume){

NSLog(@"6volume");

NSString*volumeString=[NSStringstringWithFormat:@"音量：%d",volume];

weakSelf.messageLabel.text=volumeString;

}];

}

-(void)stopItemClick:(UIBarButtonItem*)item

{

[self.voiceConversionvoiceStop];

self.messageLabel.text=@"停止录音";

}

-(void)cancelItemClick:(UIBarButtonItem*)item

{

[self.voiceConversionvoiceCancel];

self.messageLabel.text=@"取消识别";

}

#pragmamark-getter

-(VoiceConversion*)voiceConversion

{

if(!_voiceConversion)

{

_voiceConversion=[[VoiceConversionalloc]init];

}

return_voiceConversion;

}

@end

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