网络请求方法（SDK封装可以替换afn）

//个人觉得 sdk开发时候 最好不要用第三方 最好可以用最原始的方法 替换 此处仅做sdk封装使用  留存
+(void)GET:(NSString *)urlStr params:(NSDictionary *)params  sucess:(void (^)(NSURLSessionDataTask *task, id responseObject))sucess failure:(void (^)(NSURLSessionDataTask *task, NSError * error))failure
{
    urlStr = [self URLEncodedStringValue:params url:urlStr];
    NSURL *URL = [NSURL URLWithString:urlStr];

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:URL];
    [request setHTTPMethod:@"GET"];

    NSURLSession *session = [NSURLSession sharedSession];
    __block NSURLSessionDataTask *task= nil;
    task = [session dataTaskWithRequest:request
                      completionHandler:
            ^(NSData *data, NSURLResponse *response, NSError *error) {

                if (error) {
                    failure(task,error);
                } else {
                    NSError *jsonError = nil;
                    id notesJSON =
                    [NSJSONSerialization JSONObjectWithData:data
                                                    options:NSJSONReadingAllowFragments
                                                      error:&jsonError];
                    if (!jsonError) {
                        if (sucess) {
                            sucess(task,notesJSON);
                        }
                    } else {
                        if (failure) {
                            failure(task,jsonError);
                        }

                    }
                }
            }];

    [task resume];
}

+ (NSString *)URLEncodedStringValue:(NSDictionary *)Parameter url:(NSString *)urlStr
{
    if (Parameter) {
        urlStr = [urlStr stringByAppendingString:@"?"];
        NSArray *keys =[Parameter allKeys];
        for (int i=;i<keys.count;i++) {
            NSString *key = [keys objectAtIndex:i];
            NSString *value = [Parameter objectForKey:key];
            if (i==) {
                urlStr = [urlStr stringByAppendingFormat:@"%@=%@",key,value];
            } else {
                urlStr = [urlStr stringByAppendingFormat:@"&%@=%@",key,value];
            }
        }
    }
    urlStr = [urlStr stringByAddingPercentEncodingWithAllowedCharacters:NSCharacterSet.URLQueryAllowedCharacterSet];

    return urlStr;
}