Displaying Tab bar from second screen in iphone

Question

In delegate class I wrote the code as follows

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:     (NSDictionary *)launchOptions
{

 [self generateFirstScreen];
 [self removeFirstScreen]; // On login check implement this method or u can directly            write the snippet here as well.
[self prepareControllersOnTabs];  //your tab controller code function
[self.window makeKeyAndVisible];
return YES;
}
-(void) removeFirstScreen
{
[firstScreen removeFromSuperView];
self.window.rootViewController = self.tabBarController;
[firstScreen release];
}
-(void) generateFirstScreen
{ 
FirstScreen *firstScreen = [[FirstScreen alloc]init];
[self.navigationController pushViewController:firstScreen animated:YES];
[firstScreen release]; 
}

but generateFirstScreen works fine but removeFirstScreen gives an exception Please help me.

My actual requirement is First screen with out tab bar control and from second screen onwards tab bar will come .Thanks in advance — Venkat, Mar 27 '12 at 10:25
come to this chat room http://chat.stackoverflow.com/rooms/8469/room-for-andhra-pradesh-mobile-developers — Narayana Rao Routhu, Mar 27 '12 at 10:26

score 1 · Answer 1 · answered Mar 27 '12 at 10:07

1

Specify exception...

Without addSubview how can you remove it from super. Do you want to use popViewController.?

Again you are allocating firstScreen only once & releasing it twice..!

answered Mar 27 '12 at 10:07

hp iOS Coder

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As BobDev said you can remove view only if you have added it. If you want to remove firstScreen which you have pushed to UINavigationController then u have to use popViewController. So i dont suggest you to write addSubview somewhere in code – hp iOS Coder Mar 27 '12 at 10:33
1

Also dont release firstScreen in removeFirstScreen method coz you have released it already in generateFirstScreen method – hp iOS Coder Mar 27 '12 at 10:36

score 1 · Answer 2 · answered Mar 27 '12 at 10:24

1

Don't remove a screen if you're not sure it's added to a view, otherwise you get a crash.. you can specify a tag to this view and check the subviews of the main view to check whether your view is in there somewhere..

answered Mar 27 '12 at 10:24

Bob de Graaf

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score 0 · Answer 3 · answered Mar 27 '12 at 10:49

your generateFirstScreen method Change like below
FirstScreen *firstScreen = [[FirstScreen alloc]initWithNibName:@"FirstScreen" bundle:nil];
navigationController = [[UINavigationController alloc] initWithRootViewController:self.objLogin];
        // Add the navigation controller's view to the window and display.
[self.window addSubview:navigationController.view];
[self.window makeKeyAndVisible];

//call this metod when ever u want tabbar
-(void)tabBarControllerView
{   [self.navigationController.view removeFromSuperview];
    [self.navigationController.view setHidden:YES] ;
    self.tabBarController.selectedIndex = 0;
    self.tabBarController.view.hidden=NO;
    [window addSubview:self.tabBarController.view];
}

Displaying Tab bar from second screen in iphone

3 Answers3