转换到iPhone的其他视图

Question

我使用下面的代码转换到其他视图。实际上我必须从下载的xml数据中获取值，它就像 1或0 但它只显示其他部分，如果部分或行为不正常

请帮忙

-(void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict

{
    NSLog(@"Parser was called");

    if ([elementName isEqualToString:@"userId"]&&[attributeDict valueForKey:@"1"])
    {
        NSLog(@"Succeeded");

        MainScreenController *mainScreen1 = [[MainScreenController alloc] initWithNibName:@"MainScreen" bundle:nil ];

        self.mainScreen = mainScreen1;

        [self.view addSubview: mainScreen1.view];


    }else {

        NSLog(@"Go to account selection");

        ChooseAccountsController *chooseAccount = [[ChooseAccountsController alloc] initWithNibName:@"ChooseAccountsController" bundle:nil];
        self.chooseAcc = chooseAccount;
        [self.view addSubview:chooseAccount.view];

    }
}