App just shows a black screen

Question

I'm trying to make a multiview application. I started by creating an 'empty application' as I thought this would be easiest. I have 3 .xib files, the first being MainView.xib which has a view controller which is linked to my switch class, and has a tool bar to switch between the two views, and I have selected this .xib to be 'main interface' which I thought meant that should be loaded first. My other blue are RedView.xib and BlueView.xib.

I've heard this method in AppDelegate.m can cause some problems, here is mine...

- (void)applicationDidFinishLaunching:(UIApplication *)application {

    //add SwitchClasses view to the main window
    [window addSubview:switchObject.view]; 
    [window makeKeyAndVisible];
}

I don't know whether I have missed something because I started with an empty application, or if I've messed something up along the way.

Thank you for your help.

Answer 1

做这个：

window.rootViewController = switchObject;

Answer 2

First make sure that you have given reference from XIB view to the ViewController for both the Views you are using in TabBar. then try the following.

switchObject = [[[switchObject alloc] initWithNibName:@"switchObjectXib" bundle:nil] autorelease];
window.rootViewController = switchObject;
[window makeKeyAndVisible];

hope this will help you.