相信有很多公司都用过七牛，国产云存储，下面是我封装的图片上传API

整体过程：客户端向自家服务器请求token值，然后客户端再根据token值向七牛云存储上传资源，成功后会有一个回调，可以在block中获取URL，然后客户端再将URL上传到自家服务器上

//先向七牛上传图片，成功后将URL和文字内容发送到后台
- (void)getQiniuTokenWithImgArray:(NSArray*)ImgArray  successArrBlock:(void (^)(NSArray *arr))successArr{
    
    //作为上传成功后的图片的URL容器
    NSMutableArray *dataArray = [NSMutableArray array];
    int i = 0;
    for (NSData *ImgData in ImgArray) {
         //生成图片的名字key
        NSString *key = [NSString stringWithFormat:@"%@-%d",[self uuid],i]; //加个个数，防止一秒内上传多张图片，这样上传到key就都一样了
        NSString *strUrl = [NSString stringWithFormat:@"%@?uid=%@&device=%@",@"http://你自己服务器获取token的URL，找后台要",[Tools userInfoWithKey:@"id"],[Tools getDeviceID]];
        AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
        manager.requestSerializer = [AFJSONRequestSerializer serializer];
        //xmanager.responseSerializer = [AFHTTPResponseSerializer serializer];
        
        //先从服务器获取token值
        [manager GET:strUrl parameters:nil success:^(NSURLSessionDataTask * _Nonnull task, id  _Nonnull responseObject) {
    
            NSString *token = responseObject[@"uptoken"];
            //NSLog(@"token---%@",token);
            //调用七牛的上传接口
            QNUploadManager *upManager = [[QNUploadManager alloc] init];
            [upManager putData:ImgData key:key token:token
                      complete: ^(QNResponseInfo *info, NSString *key, NSDictionary *resp) {
                          NSString *imgUrlStr = [NSString stringWithFormat:@"%@%@",@"http://七牛的域名/",key];
                          [dataArray addObject:imgUrlStr];
                          //上传图片的个数和返回的URL个数得一样
                          if (dataArray.count == ImgArray.count) {
                              //得到的URL数组，这些URL要上传的自己的服务器
                              successArr(dataArray);
                          }
                      } option:nil];
            
        } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
            NSLog(@"获取token失败：%@",error.description);
        }];
        i++;
    }
}

//通用唯一识别码
- (NSString*) uuid {

//    CFUUIDRef puuid = CFUUIDCreate( nil );
//    CFStringRef uuidString = CFUUIDCreateString( nil, puuid );
//    NSString * result = (NSString *)CFBridgingRelease(CFStringCreateCopy( NULL, uuidString));
//    CFRelease(puuid);
//    CFRelease(uuidString);
//    return result;
    
    //根据当前系统时间生成图片名称
    NSDate *date = [NSDate date];
//    NSDateFormatter *formatter = [[NSDateFormatter alloc]init];
//    [formatter setDateFormat:@"yyyy-MM-dd-HH-mm-ss"];
     long time=(long)[date timeIntervalSince1970]; //获取时间戳
    
    return [NSString stringWithFormat:@"babyShow/%ld",time];
}


//通过GET去请求数据
+ (NSURLSessionDataTask *)GetDataWithURI:(NSString *)URI Block:(void(^)(id obj,NSError *error))block{
    
    return [[AFAppDotNetAPIClient sharedClient] GET:URI parameters:nil success:^(NSURLSessionDataTask * _Nonnull task, id  _Nonnull responseObject) {
        //responseObject  返回的数据
        block(responseObject,nil);
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        //NSLog(@"%@",[error localizedDescription]);
        block(nil,error);
    }];
}