當在xcode中點擊後退按鈕時加載tabbarcontroller？

Question

當我點擊後退按鈕，然後我加載一個特定的view.But到那個特定的視圖，我必須添加一個tabbarController.How我可以做到嗎？？當我嘗試添加它不會得到添加..不知道y？

-(IBAction)switchtofirst { 
AppViewController *first=[[AppViewController alloc] initWithNibName:@"AppViewController" bundle:nil]; 
     Login *second=[[Login alloc]initWithNibName:@"Login" bundle:nil]; 
     second.title=@"Login"; 
     NSArray *viewArray=[[NSArray alloc] initWithObjects: first,second,nil]; 
     tabBarController=[[UITabBarController alloc] init]; 
     [tabBarController setViewControllers:viewArray animated:NO]; 
     AppViewController *gp=[AppViewController alloc]; 
     [gp.view addSubview:tabBarController.view]; 
     [self presentModalViewController:gp animated:NO]; 
     [gp release]; 
     } 

Answer 1

嘗試是這樣的：

-(IBAction)switchtofirst { 

    AppViewController *first = [[AppViewController alloc] initWithNibName:@"AppViewController" bundle:nil]; 
    Login *second=[[Login alloc]initWithNibName:@"Login" bundle:nil]; 
    second.title=@"Login"; 

    NSArray *viewArray= [NSArray arrayWithObjects:first, second, nil]; 

    tabBarController=[[UITabBarController alloc] init]; 
    [tabBarController setViewControllers:viewArray animated:NO]; 

    [self presentViewController:tabBarController animated:YES completion:nil]; 
}