问用AFNetworking解析iOS 5中的JSON

EN

-(void) loginWithUserID:(NSString*)usrID User:(NSString*)usr Password:(NSString *)psw Sender:(id)sender
{
    if ([sender respondsToSelector:@selector(startLoading)]){
        [sender performSelector:@selector(startLoading)];
    }

    baseURL = [NSString stringWithFormat:
                  @"http://xxx.xxx.xxx.xxx/test/service.svc/weblogin"];
    NSString* serviceURL = [NSString stringWithFormat:
                           @"%@?userID=%@&user=%@&password=%@",baseURL,usrID,usr,psw;

    NSURL *url = [NSURL URLWithString:[serviceURL stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding]];

    NSURLRequest *request = [NSURLRequest requestWithURL:url];

    AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
        self.LoginOK = [JSON valueForKeyPath:@"LoginOK"];
        if (LoginOK.intValue == 1) {
            NSDictionary *usrData = [JSON valueForKeyPath:@"userData"];
            userData = [[UserData alloc]init];
            [userData readFromJSONDictionary:usrData];
            NSLog(@"Userdata: %@",userData);
            if ([sender respondsToSelector:@selector(loginSuccessful:)])
            {
                [sender performSelector:@selector(loginSuccessful:)];
            }
        }else{
            UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"Error" message:@"No Correct Login Credentials" delegate:self cancelButtonTitle:@"OK" otherButtonTitles: nil];
            [alertView show];
            ;}

    } failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {
        if ([sender respondsToSelector:@selector(stopLoading)]){
            [sender performSelector:@selector(stopLoading)];
        }
        [[[UIAlertView alloc] initWithTitle:@"Error"
                                    message:@"Loginservice not available! Check your connection!"
                                   delegate:nil
                          cancelButtonTitle:@"OK"
                          otherButtonTitles: nil] show];
        NSLog(@"Error: %@", error);

    }];

    [operation start];
    };

-(void)readFromJSONDictionary:(NSDictionary *)d
{

    [self setProperty1:[d objectForKey:@"property1"]];
}

NSDictionary *data = [JSON valueForKeyPath:@"data"];