AFN

http://www.jianshu.com/p/047463a7ce9b

AFN简介

• 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

AFN基本使用

• 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 *)URLString
                parameters:(id)parameters
 constructingBodyWithBlock:(void (^)(id <AFMultipartFormData> formData))block
                success:(void (^)(NSURLSessionDataTask *task, id responseObject))success
                failure:(void (^)(NSURLSessionDataTask *task, NSError *error))failure

```
- 网络监控

```objc
    //网络监控
 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
```

• GET

// AFHTTPSessionManager内部包装了NSURLSession
AFHTTPSessionManager *mgr = [AFHTTPSessionManager manager];

NSDictionary *params = @{
                         @"username" : @"xxx",
                         @"pwd" : @"xxx"
                         };

[mgr GET:@"http://120.25.226.186:32812/login" parameters:params success:^(NSURLSessionDataTask *task, id responseObject) {
    NSLog(@"请求成功---%@", responseObject);
} failure:^(NSURLSessionDataTask *task, NSError *error) {
    NSLog(@"请求失败---%@", error);
}];

• POST

// AFHTTPSessionManager内部包装了NSURLSession
AFHTTPSessionManager *mgr = [AFHTTPSessionManager manager];

NSDictionary *params = @{
                         @"username" : @"xxx",
                         @"pwd" : @"xxx"
                         };

[mgr POST:@"http://xxx/login" parameters:params success:^(NSURLSessionDataTask *task, id responseObject) {
    NSLog(@"请求成功---%@", responseObject);
} failure:^(NSURLSessionDataTask *task, NSError *error) {
    NSLog(@"请求失败---%@", error);
}];

• 文件上传

AFHTTPSessionManager *mgr = [AFHTTPSessionManager manager];

[mgr POST:@"http://xxxx/upload" parameters:@{@"username" : @"123"}
    constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
    // 在这个block中设置需要上传的文件
//            NSData *data = [NSData dataWithContentsOfFile:@"/Users/wh/Desktop/placeholder.png"];
//            [formData appendPartWithFileData:data name:@"file" fileName:@"test.png" mimeType:@"image/png"];

//            [formData appendPartWithFileURL:[NSURL fileURLWithPath:@"/Users/wh/Desktop/placeholder.png"] name:@"file" fileName:@"xxx.png" mimeType:@"image/png" error:nil];

        [formData appendPartWithFileURL:[NSURL fileURLWithPath:@"/Users/wh/Desktop/placeholder.png"] name:@"file" error:nil];
} success:^(NSURLSessionDataTask *task, id responseObject) {
    NSLog(@"-------%@", responseObject);
} failure:^(NSURLSessionDataTask *task, NSError *error) {

}];