ios中的网络请求

GET请求   

NSString *urlString = @"http://";//请求的地址

    //    对于中文的话要对请求地址实行 UTF－8编码

    

    [urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

    

    NSURLRequest *Request = [NSURLRequestrequestWithURL:urlString];

    

    NSURLConnection *connect = [NSURLConnectionconnectionWithRequest:Request delegate:self];

    

    [connect start];

POST请求

  NSMutableURLRequest *request = [NSMutableURLRequestrequestWithURL:[NSURLURLWithString:urlString]];

    

    

    NSString *bodyStr  = [NSStringstringWithFormat:@"username=%@&password=%@"];

    

    NSData *body = [bodyStrdataUsingEncoding:NSUTF8StringEncoding];

    

    [request setHTTPBody:body];

    [request setHTTPMethod:@"POST"];

    

    NSURLConnection *connect = [NSURLConnectionconnectionWithRequest:request delegate:self];

    

    [connect start];

代理方法的问题

代理方法比较多，比较分散

要处理一个请求，需要在很多地方编写代码，不利于逻辑实现，代码编写，调试和维护以及拓展