如何删除背景视图

Question

我的视图控制器上使用UITabBarController即launchviewcontroller其含有上loadview如下代码：

- (void)loadView 
{ 
    viewControllers=[[NSMutableArray alloc]initWithCapacity:2]; 
    tabBarController=[[UITabBarController alloc]init]; 
    MyProfileViewController *view1=[[MyProfileViewController alloc]init]; 
    localNavigationController=[[UINavigationController alloc]initWithRootViewController:view1]; 
    localNavigationController.navigationBar.alpha=1.0; 
    // localNavigationController.navigationBar.tintColor=[UIColor colorWithRed:0.65 green:0.84 blue:0.88 alpha:1]; 
    localNavigationController.navigationBar.tintColor=[UIColor blackColor]; 

    // localNavigationController.navigationBar. 
    [viewControllers addObject:localNavigationController]; 
    [view1 release]; 
    [localNavigationController release]; 
    localNavigationController=nil; 


    TodaysPicksViewController *view2=[[TodaysPicksViewController alloc]initWithLeagueType:@"CFL Football"]; 
    localNavigationController=[[UINavigationController alloc]initWithRootViewController:view2]; 
    localNavigationController.navigationBar.alpha=1.0; 
    localNavigationController.navigationBar.tintColor=[UIColor blackColor]; 
    [viewControllers addObject:localNavigationController]; 
    [view2 release]; 
    [localNavigationController release]; 
    localNavigationController=nil; 


    Rules_PoliciesViewController *view3=[[Rules_PoliciesViewController alloc]init]; 
    localNavigationController=[[UINavigationController alloc]initWithRootViewController:view3]; 
    localNavigationController.navigationBar.alpha=1.0; 
    localNavigationController.navigationBar.tintColor=[UIColor blackColor]; 
    [viewControllers addObject:localNavigationController]; 
    [view3 release]; 
    [localNavigationController release]; 
    localNavigationController=nil; 

    LogoutViewController *view4=[[LogoutViewController alloc]init]; 
    localNavigationController=[[UINavigationController alloc]initWithRootViewController:view4]; 
    localNavigationController.navigationBar.alpha=1.0; 
    localNavigationController.navigationBar.tintColor=[UIColor blackColor]; 
    [viewControllers addObject:localNavigationController]; 
    [view4 release]; 
    [localNavigationController release]; 
    localNavigationController=nil; 

    appDel=[[UIApplication sharedApplication]delegate]; 

    tabBarController.viewControllers=viewControllers; 
    [appDel.window addSubview:tabBarController.view]; 
    [viewControllers release]; 

}

现在，作为用户进行到第四突出部从应用程序我注销设置了按钮登录再次重定向由上按钮点击添加代码作为登录视图：

-(void)ClickOnLogin 
{ 
    LoginViewController *LoginViewOb=[[LoginViewController alloc]init]; 
    LoginViewOb.hidesBottomBarWhenPushed = YES; 
    [self.navigationController pushViewController:LoginViewOb animated:YES]; 
    [LoginViewOb release]; 
} 

但作为登录视图是负载ed先前的视图仍然位于登录视图的后面。我怎样才能从后台删除这个视图。

Answer 1

你应该登录查看

- (void)viewWillAppear:(BOOL)animated 
{ 
    self.navigationItem.leftBarButtonItem=nil; 
    self.navigationItem.hidesBackButton=YES; 
    [super viewWillAppear:animated]; 

}