.h 中

#import <Foundation/Foundation.h>

typedef void(^Sucess)(id responseData);
typedef void(^Failure)(NSError *error);
@interface NetWorkManager : NSObject
+ (instancetype)sharedInstance;

/**
*  发送get请求
*
*  @param URLString  请求的网址字符串
*  @param parameters 请求的参数
*  @param success    请求成功的回调
*  @param failure    请求失败的回调
*/
- (void)getWithURLString:(NSString *)URLString success:(void (^)(id responseObject))success failure:(void (^)(NSError *error))failure;
/**
*  发送post请求
*
*  @param URLString  请求的网址字符串
*  @param parameters 请求的参数
*  @param success    请求成功的回调
*  @param failure    请求失败的回调
*/
- (void)postWithURLString:(NSString *)URLString
             parameters:(id)parameters
                success:(void (^)(id responseObject))success
                failure:(void (^)(NSError *error))failure;

@end

.m 中

#import "NetWorkManager.h"
#import <AFNetworking.h>
@implementation NetWorkManager
static id _instance = nil;
+ (instancetype)sharedInstance {
    return [[self alloc] init];
}


#pragma mark -- GET请求 --
- (void)getWithURLString:(NSString *)URLString
                 success:(void (^)(id))success
                 failure:(void (^)(NSError *))failure {
    
    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
    
    manager.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"application/json",@"text/json",@"text/javascript",@"text/html", nil];
    manager.requestSerializer.timeoutInterval = 30;
    [manager GET:URLString parameters:nil progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
        if (success) {
            success(responseObject);
        }
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        if (failure) {
            failure(error);
        }
    }];
}
#pragma mark -- POST请求 --
- (void)postWithURLString:(NSString *)URLString
               parameters:(id)parameters
                  success:(void (^)(id))success
                  failure:(void (^)(NSError *))failure {
    
    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
  manager.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"application/json",@"text/json",@"text/javascript",@"text/html", nil];
    [manager POST:URLString parameters:parameters progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
        if (success) {
            success(responseObject);
        }
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        if (failure) {
            failure(error);
        }
    }];
}

Viewcontroller 中调用

// get 请求, post 类似
[[NetWorkManager sharedInstance]getWithURLString:@"geturl" success:^(id responseObject) {
        NSLog(@"地方舒服舒服 = %@",responseObject);
    } failure:^(NSError *error) {
        
    }];