网络请求工具是我们经常用到的工具类，下面用OC语言和Swift语言封装AFNetworking网络请求工具，废话不多说，直接上代码。

OC语言封装AFN网络请求工具

• 创建类NetworkTool，继承AFHTTPSessionManager

.h文件

#import <Foundation/Foundation.h>
#import "AFNetworking.h"
@interface NetworkTool : AFHTTPSessionManager
//创建单例
+ (instancetype)sharedTool;
 //网络请求方法
- (void)requestWithURL:(NSString *)url parameters: (NSDictionary *)parameters method: (NSString *)method callBack: (void(^)(id responseObject))callBack;
@end

.m文件--分两种方法实现

1.先来个普通的实现方法

#import "NetworkTool.h"
@implementation NetworkTool
//单例实现
+ (instancetype)sharedTool{
static id instance = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
    instance = [[self alloc]init];
});
return instance;
}

-(void)requestWithURL:(NSString *)url parameters:(NSDictionary *)parameters method:(NSString *)method callBack:(void (^)(id))callBack{
 //判断发送的是什么请求
 //GET请求
   if([method isEqualToString:@"GET"]) {
    [self GET:url parameters:parameters progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
        callBack(responseObject);
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        NSLog(@"%@",error);
    }];
   }
    //POST请求
    if ([method isEqualToString:@"POST"]) {
        [self POST:url parameters:parameters progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
            callBack(responseObject);
        } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
            NSLog(@"%@",error);
        }];
    }
}
@end

2.参考到AFN内部POST,GET等请求都是用同一个方法实现：dataTaskWithHTTPMethod，我们来封装一下

• 由于AFN内部的dataTaskWithHTTPMethod方法时私有的，我们如果不做处理在这里无法使用的
• 如何使用父类的私有方法？---利用OC运行时，当发送消息调用方法时在本类中找不到该方法，则会去父类中调用

     #import "NetworkTool.h"
     //1.创建协议，声明协议方法，把AFN内部的实现方法复制过来
     @protocol OCNetworkToolProtocol <NSObject>
     - (NSURLSessionDataTask  *)dataTaskWithHTTPMethod:(NSString *)method
                                   URLString:(NSString *)URLString
                                  parameters:(id)parameters
                              uploadProgress:(nullable void (^)(NSProgress *uploadProgress)) uploadProgress
                            downloadProgress:(nullable void (^)(NSProgress *downloadProgress)) downloadProgress
                                     success:(void (^)(NSURLSessionDataTask *, id))success
                                     failure:(void (^)(NSURLSessionDataTask *, NSError *))failure;
     @end

     //2.遵守协议
     @interface NetworkTool()<OCNetworkToolProtocol>
     @end
      //然后就可以调用了
     @implementation NetworkTool
     //单例实现
     + (instancetype)sharedTool{
     static id instance = nil;
     static dispatch_once_t onceToken;
     dispatch_once(&onceToken, ^{
     instance = [[self alloc]init];
     });
     return instance;
     }

     -(void)requestWithURL:(NSString *)url parameters:(NSDictionary *)parameters method:(NSString *)method callBack:(void (^)(id))callBack{
     //如果使用父类的dataTask方法（由于是父类的私有方法，所以调用不了，这时要使用代理），则不用判断
     NSURLSessionDataTask *dataTask = [self dataTaskWithHTTPMethod:method URLString:url parameters:parameters uploadProgress:nil downloadProgress:nil success:^(NSURLSessionDataTask *task, id responseObject) {
        callBack(responseObject);
        } failure:^(NSURLSessionDataTask *task, NSError *error) {
        NSLog(@"%@",error);
       }];

• 使用哪种看个人爱好，目的都是一样的。

Swift语言封装AFN网络请求工具

• 创建类继承AFHTTPSessionManager

import Foundation
class SwiftNetworkTool: AFHTTPSessionManager {
//创建单例
static let shared = SwiftNetworkTool()
//网络工具方法
func reqeust(url: String, paramaters: [String: Any]? = nil, method: String, callBack:@escaping (_ responseObject:Any?)->()){
    
    //抽取请求成功和失败的闭包
    let success = {
        (task: URLSessionDataTask, responseObject: Any?) in callBack(responseObject)
    }
    let failure = {
        (task: URLSessionDataTask?,error: Error) in
        callBack(nil)
    }
    
    //GET请求网络数据
    if method == "GET" {
        self.get(url, parameters: paramaters, progress: nil, success: success, failure: failure)
    }
    //POST请求网络数据
    if method == "POST" {
        self.post(url, parameters: paramaters, progress: nil, success: success, failure: failure)
    }   
} 
}