最近需求说有语音搜索功能,查了下资料然后找到科大讯飞的一些资料,作为自己学习简单记录下来.
一.到讯飞开放平台(http://www.xfyun.cn/)下载SDK
按照demo中的步骤一步一步获取即可.打开demo运行就可实现语音听写功能.
二.根据项目需求需要实现的功能类似于京东的语音搜索,具体步骤如下:
1.创建工程,添加静态库

QQ图片20160524151637.jpg

QQ图片20160524152006.jpg

//语音识别相关
#import <iflyMSC/IFlyRecognizerViewDelegate.h>
#import <iflyMSC/IFlyRecognizerView.h>
#import <iflyMSC/IFlySpeechConstant.h>
#import <iflyMSC/IFlySpeechUtility.h>

4.在AppDelegate.m文件中的- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions里添加如下代码：

QQ图片20160524152304.jpg

此时的appid即为在讯飞配置项目时的appid.
5.在VC中的代码

#import "ViewController.h"

//声明代理
@interface ViewController ()<IFlyRecognizerViewDelegate>
//声明一个IFlyRecognizerView的属性.
@property (nonatomic, strong) IFlyRecognizerView *iflyRecognizerView;
@end

#pragma mark  =======  懒加载  =======
- (IFlyRecognizerView *)iflyRecognizerView{
    if(!_iflyRecognizerView){
        _iflyRecognizerView = [[IFlyRecognizerView alloc] initWithCenter:self.view.center];
        [self.view addSubview:_iflyRecognizerView];
    }
    return _iflyRecognizerView;
}

//语音转化为文字完成的时候,执行的方法
- (void)onResult:(NSArray *)resultArray isLast:(BOOL)isLast{
    
    NSLog(@"isLast:%d-----resultArray:%@",isLast,resultArray);
    //1,先将 resultArray 的第一个元素取出(字典类型)
    NSDictionary *dic = resultArray[0];
    //2,由于有用的信息在 dic 的 key 值中,所以我们一会要取出 key 值.
    NSString *jsonResult = [dic allKeys].lastObject;
    //3,解析 jsonresult, 取出语音转换好的文字
    NSString *resultString = [self transFromWithSouceString:jsonResult];
    //将文字呈现在 testView 上
    UITextView *textView = [self.view viewWithTag:1000];
    if (textView.text) {  //说明 textView 上已经有文字,那就直接拼接.
        textView.text = [NSString stringWithFormat:@"%@%@",textView.text,resultString];
    }else{//无文字,直接赋值
        textView.text = resultString;
    }
    //取消\结束转换
    [self.iflyRecognizerView cancel];
}

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor yellowColor];
    
    //设置代理
    self.iflyRecognizerView.delegate = self;
    //设置的是当前主要功能    iat:将语音转化为文本
    [self.iflyRecognizerView setParameter:@"iat" forKey:[IFlySpeechConstant IFLY_DOMAIN]];
    //设置的是语音存储位置  语音默认保存位置
    [self.iflyRecognizerView setParameter:@"asrview.pcm" forKey:[IFlySpeechConstant ASR_AUDIO_PATH]];
    //在未启动语音功能时,隐藏界面
    self.iflyRecognizerView.hidden = YES;
    
    
    //启动按钮(添加按钮,在点击按钮时,调用方法)
    UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];
    [button setFrame:CGRectMake(100,100, 100, 50)];
    [button setTitle:@"语音听写" forState: UIControlStateNormal];
    [button addTarget:self action:@selector(startRecoder:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:button];
    
    //初始化 testView, 用来显示识别好的文字
    UITextView *textView = [[UITextView alloc] initWithFrame:CGRectMake(50, 200, 200, 50)];
    textView.backgroundColor = [UIColor redColor];
    [self.view addSubview:textView];
    textView.tag = 1000;//提供表示符.
}

#pragma mark-----回调按钮.
- (void)startRecoder:(UIButton*)sender{
    
    UITextView *testView = [self.view viewWithTag:1000];
    testView.text = @"";
    //启动识别服务
    [self.iflyRecognizerView start];
    //让隐藏的界面展现出来
//        self.iflyRecognizerView.hidden = NO;
}

//例如将以下文字的内容输出'' 今天的天气怎么样.''     {"sn":1,"ls":true,"bg":0,"ed":0,"ws":[{"bg":0,"cw":[{"w":" 今天 ","sc":0}]},{"bg":0,"cw":[{"w":" 的","sc":0}]},{"bg":0,"cw":[{"w":" 天气 ","sc":0}]},{"bg":0,"cw":[{"w":" 怎么样 ","sc":0}]},{"bg":0,"cw":[{"w":" 。","sc":0}]}]}
- (NSString*)transFromWithSouceString:(NSString*)sourceString{
    if (sourceString == nil) {  //如果 sourceString 不存在,就不进行数据处理.
        return @"";
    }
    //1.将 json 串转换为需要的字典类型.
    /**
     现将字符串转换为 NSData 类型
     */
    NSData *dataSource= [sourceString dataUsingEncoding:NSUTF8StringEncoding];
    //万一崩溃,先检查 source 是否有值
    //将data 解析为字典
    NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:dataSource options:NSJSONReadingAllowFragments error:nil];
    //先取出'ws'对应的值,
    NSArray *wsArray = [dic objectForKey:@"ws"];
    
    //声明一个可变字符串,用来拼接可变字符
    NSMutableString *resultString = [[NSMutableString alloc] init];
    //遍历wsArray,取出该数组当中的所有元素(字典)
    for (NSDictionary *itemDic in wsArray) {
        //itemDic 的数据结构->{"bg":0,"cw":[{"w":" 今天 ","sc":0}]}
        /**
         *  将 itemDic 当中的 cw的值取出,该值得类型为数组.
         */
        NSArray *cwarray = [itemDic objectForKey:@"cw"];
        //遍历 cwarray,取出该数组当中的所有元素(字典);
        for (NSDictionary *cwdic in cwarray) {
            //cwdic 的数据结构为{"w":" 今天 ","sc":0}
            //1,先将 w 所对应的值取出
            NSString *wString = cwdic[@"w"];
            //将 w 的值拼接起来.拼接到 resultString 中
            [resultString appendString:wString];
        }
    }
    //将最终的字符返回
    return resultString;
}

参考文章:

http://blog.csdn.net/creamy521/article/details/42263039