HTTPRequest.h文件
//请求成功回调
typedef void(^RequestSuccessCallBack)(id resposeObject);
//请求失败回调
typedef void(^RequestErrorCallBack)(NSError *error);

@interface HTTPRequest : NSObject

/**
 *  GET请求
 *  @param urlString url地址
 *  @param parameter 参数
 *  @param success   成功回调
 *  @param failure   失败回调
 */
+(void)GET:(NSString *)urlString parameter:(NSDictionary *)parameter success:(RequestSuccessCallBack)success failure:(RequestErrorCallBack)failure;

/**
 *  POST请求
 *  @param urlString url地址
 *  @param parameter 参数
 *  @param success   成功回调
 *  @param failure   失败回调
 *  @return NSURLSessionDataTask
 */
+(NSURLSessionDataTask *)POST:(NSString *)urlString parameter:(NSDictionary *)parameter success:(RequestSuccessCallBack)success failure:(RequestErrorCallBack)failure;

HTTPRequest.m文件
#import "HTTPRequest.h"
#import "AFNetworking.h"
@implementation HTTPRequest
/**
 *  GET请求
 *  @param urlString url地址
 *  @param parameter 参数
 *  @param success   成功回调
 *  @param failure   失败回调
 */
+(void)GET:(NSString *)urlString parameter:(NSDictionary *)parameter success:(RequestSuccessCallBack)success failure:(RequestErrorCallBack)failure{
    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
    [manager GET:urlString parameters:parameter progress:^(NSProgress * _Nonnull downloadProgress) {
    } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
        if (success) {
            success(responseObject);
        }
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        if (failure) {
            failure(error);
        }
    }];
}
/**
 *  POST请求
 *  @param urlString url地址
 *  @param parameter 参数
 *  @param success   成功回调
 *  @param failure   失败回调
 *  @return NSURLSessionDataTask
 */
+(NSURLSessionDataTask *)POST:(NSString *)urlString parameter:(NSDictionary *)parameter success:(RequestSuccessCallBack)success failure:(RequestErrorCallBack)failure{
    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
    NSURLSessionDataTask *dataTask = [manager POST:urlString parameters:parameter progress:^(NSProgress * _Nonnull uploadProgress) {
    } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
        if (success) {   
            success(responseObject);
        }
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        if (failure) {
            failure(error);
        }
    }];
    return dataTask;
}

• 调用(导入#import "HTTPRequest.h")

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