众所周知。苹果搞的一套框架NSContention发送请求与接收请求的方式十分繁琐。操作起来非常不方便。

不仅要做区分各种请求设置各种不同的參数，并且还要常常在多线程里操作，同一时候还要对请求与返回的数据做各种序列化的操作。同一时候还要考虑请求数据的安全等一堆问题。

AFNetworking的出现：MAC/iOS设计的一套网络框架.(为了简化网络操作)

二、AFNetworking的使用

关于改动AFN源代码：通常序列化时做对text/plan等的支持时。能够一劳永逸的改动源代码，在acceptableContentTypes中改动就可以。

AFN进行GET、POST登录：

#pragma mark - get/post登录
- (void)getLogin {
	//1.管理器
	AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

	//2.设置登录參数
	NSDictionary *dict = @{ @"username":@"xn", @"password":@"123" };

	//3.请求
	[manager GET:@"http://localhost/login.php" parameters:dict success: ^(AFHTTPRequestOperation *operation, id responseObject) {
	    NSLog(@"GET --> %@, %@", responseObject, [NSThread currentThread]); //自己主动返回主线程
	} failure: ^(AFHTTPRequestOperation *operation, NSError *error) {
	    NSLog(@"%@", error);
	}];
}

/**
 *  和上面的GET使用方法全然一样, 仅仅有一个POST參数不一样
 */
- (void)postLogin {
	//1.管理器
	AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

	//2.设置登录參数
	NSDictionary *dict = @{ @"username":@"xn", @"password":@"123" };

	//3.请求
	[manager POST:@"http://localhost/login.php" parameters:dict success: ^(AFHTTPRequestOperation *operation, id responseObject) {
	    NSLog(@"POST --> %@, %@", responseObject, [NSThread currentThread]); //自己主动返回主线程
	} failure: ^(AFHTTPRequestOperation *operation, NSError *error) {
	    NSLog(@"%@", error);
	}];
}

AFN进行网络数据解析。获取Plist，JSON。XML（AFN不支持自己主动解析XML，有专门的框架去做，如SAX。PULL。KissXML等）

#pragma mark - get 数据解析
- (void)getJSON {
	//1.请求管理器
	AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

	//2.发起请求
	[manager GET:@"http://localhost/videos.json" parameters:nil success: ^(AFHTTPRequestOperation *operation, id responseObject) {
	    NSLog(@"%@", responseObject);
	} failure: ^(AFHTTPRequestOperation *operation, NSError *error) {
	    NSLog(@"%@", error);
	}];
}

/**
 *  不支持XML数据解析
 */
- (void)getXML {
	//1.管理器
	AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

	//2.设置返回数据类型
	manager.responseSerializer = [AFXMLParserResponseSerializer serializer]; //先实例化一下

	//3.发起请求
	[manager GET:@"http://localhost/videos.xml" parameters:nil success: ^(AFHTTPRequestOperation *operation, id responseObject) {
	    NSLog(@"%@", responseObject);
	} failure: ^(AFHTTPRequestOperation *operation, NSError *error) {
	    NSLog(@"%@", error);
	}];
}

- (void)getPlist {
	//1.管理器
	AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

	//2.设置response类型
	manager.responseSerializer = [AFPropertyListResponseSerializer serializer]; //是Response, 别写成request了. 改动为plist类型.
	manager.responseSerializer.acceptableContentTypes = [NSSet setWithObject:@"text/plain"]; //这个能够直接往框架里面改动.

	//3.请求
	[manager GET:@"http://localhost/videos.plist" parameters:nil success: ^(AFHTTPRequestOperation *operation, id responseObject) {
	    NSLog(@"%@", responseObject);
	} failure: ^(AFHTTPRequestOperation *operation, NSError *error) {
	    NSLog(@"%@", error);
	}];
}

用AFN来POST JSON数据，上传、下载等。（上传、下载主页说明上有https://github.com/AFNetworking/AFNetworking）

#pragma mark - post json数据与上传文件等
- (void)postJSON {
	//1.管理器
	AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

	//2.设定类型. (这里要设置request-response的类型)
	manager.requestSerializer = [AFJSONRequestSerializer serializer];
	manager.responseSerializer = [AFHTTPResponseSerializer serializer]; //这个决定了以下responseObject返回的类型
//    manager.responseSerializer = [AFJSONResponseSerializer serializer];
//	manager.responseSerializer.acceptableContentTypes = [NSSet setWithObject:@"text/plain"];
    
    //2.设置登录參数
	NSDictionary *dict = @{ @"username":@"xn", @"password":@"123" };

	//3.发送请求
	[manager POST:@"http://localhost/postjson.php" parameters:dict success: ^(AFHTTPRequestOperation *operation, id responseObject) {
//	    NSLog(@"postjson--> %@", responseObject);  //这样显示JSON的话须要设置text/plain
        NSString *result = [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding];
        NSLog(@"%@",result);
	} failure: ^(AFHTTPRequestOperation *operation, NSError *error) {
	    NSLog(@"%@", error);
	}];
}

转载请注明出处：http://blog.csdn.net/xn4545945