troubles adding splash screen subviews to UIwindow

Question

Hi, I have an app that has a login screen and splash screen. I want these screens to show up one after the other, and as such I have resulted to adding them as subviews to the app delegate's window property.

[window addSubview:mainViewController.view];
[window addSubview:loginViewController.view];
[window addSubview:splashScreenViewController.view];

The problem is that each subsequent subview that is added seems to appear in a weird manner(the orientation of the nib file is not obeyed). I know my nib files are not at fault, because if I only include one view, no matter which view it is, it shows up right. Furthermore, if I add the views as subviews to the main view controller's view(as opposed to app delegates) view, i dont get this issue. However, there is a 20px gap at the bottom of the screen because I guess UIWindow accounts for the status bar, and normal UIView's do not.

Does anyone have any idea what the problem might be? Is UIWindow doing something special? Am I not supposed to add several subviews to UIWindow? If anyone has tips regarding how to do splash screens, that would be much appreciated.

Answer 1

I suggest you use a UIView in the middle...

UIView view = [[UIView alloc] init];
[view addSubview:mainViewController.view];
[view addSubview:loginViewController.view];
[view addSubview:splashScreenViewController.view];
[window addSubview:view];
[view release];

After what if you what to animate as a splash screen, take a look at one of my post : http://stackoverflow.com/questions/3419053/how-to-open-a-new-uiview-like-a-popup/3419627#3419627

Answer 2

You should only have 1 view controller at a time.

Answer 3

You should use the -(void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController delegate function to check which tab was clicked. If it's your second view (which it should be if there are only 2 tabs) then call a custom method in your splashscreencontroller that pops up the modal. If that splash screen is only supposed to show once, make sure to set a flag afterwards to make sure it doesn't pop up again.

A TabBarController loads all the views before displaying them, so there's no lag when a user switches between tags.