1.新建一个继承于NSObject类的类，在.h文件中

#import "AFHTTPRequestOperationManager.h"

//定义两个block来接收请求成功和失败

typedef  void(^DownLoadFinishedBlock)(id responseObj);

typedef void (^DownLoadFialedBlock)(NSError*error);

@interface NetManager : NSObject

//Get请求的方法封装

+(void)doGetWithUrlStr:(NSString*)urlString contentType:(NSString*)type finished:(DownLoadFinishedBlock)finished failure:(DownLoadFialedBlock)fialed;

//Post请求的方法封装

+(void)doPostWithUrlStr:(NSString*)urlString parameters:(NSDictionary*)dic contentType:(NSString*)type finished:(DownLoadFinishedBlock)finished failure:(DownLoadFialedBlock)fialed;

2.下面是封装方法的实现：

#import "NetManager.h"

@implementation NetManager

//Get请求的方法

+(void)doGetWithUrlStr:(NSString*)urlString contentType:(NSString*)type finished:(DownLoadFinishedBlock)finished failure:(DownLoadFialedBlock)fialed{

　　//创建manager对象

AFHTTPRequestOperationManager * manager = [AFHTTPRequestOperationManager manager];

　　//设置请求的数据类型

manager.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:type, nil];

[manager GET:urlString parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {

　　//请求成功

finished(responseObject);

} failure:^(AFHTTPRequestOperation *operation, NSError *error) {

　　//请求失败

fialed(error);

}];

}

//Post请求的方法

//说明：parameters：参数,即使用post请求时需要传给后台服务器的参数，在这里我们应封装成一个字典类型的数据，然后把这个字典当做参数传过去。

+(void)doPostWithUrlStr:(NSString*)urlString parameters:(NSDictionary*)dic contentType:(NSString*)type finished:(DownLoadFinishedBlock)finished failure:(DownLoadFialedBlock)fialed

{

　　//创建manager对象　　

AFHTTPRequestOperationManager * manager = [AFHTTPRequestOperationManager manager];

　　//设置请求的数据类型　　

manager.responseSerializer = [AFHTTPResponseSerializer serializer];

manager.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:type, nil];

[manager POST:urlString parameters:dic success:^(AFHTTPRequestOperation *operation, id responseObject) {

finished(responseObject);

} failure:^(AFHTTPRequestOperation *operation, NSError *error) {

fialed(error);

}];

}

@end