什么是AFN

- 全称是AFNetworking，是对NSURLConnection的一层封装

- 虽然运行效率没有ASI高，但是使用比ASI简单

- 在iOS开发中，使用比较广泛

 AFN的github地址

- https://github.com/pokeb/AFNetworking/AFNetworking

AFHTTPSessionManager

AFHTTPSessionManager

    - 是AFN中最重要的对象之一

    - 封装了HTTP请求的常见处理

         - GET\POST请求

         - 解析服务器的响应数据

创建

AFHTTPSessionManager *mgr = [AFHTTPSessionManager manager];

GET\POST请求

// GET请求

- (NSURLSessionDataTask *)GET:(NSString *)URLString

parameters:(id)parameters

success:(void (^)(NSURLSessionDataTask *task, id responseObject))success

failure:(void (^)(NSURLSessionDataTask *task, NSError *error))failure

// POST请求

- (NSURLSessionDataTask *)POST:(NSString *)URLString

parameters:(id)parameters

success:(void (^)(NSURLSessionDataTask *task, id responseObject))success

failure:(void (^)(NSURLSessionDataTask *task, NSError *error))failure

文件上传

- (NSURLSessionDataTask *)POST:(NSString *)URLStringparameters:(id)parameters   constructingBodyWithBlock:(void (^)(idformData))block

success:(void (^)(NSURLSessionDataTask *task, id responseObject))success

failure:(void (^)(NSURLSessionDataTask *task, NSError *error))failure

监控联网状态

AFNetworkReachabilityManager *manager = [AFNetworkReachabilityManager sharedManager];

[manager startMonitoring];

[manager setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {

NSLog(@"%d", status);

}];

提示：要监控网络连接状态，必须要先调用单例的startMonitoring方法