Actually, your view controllers are restored between application:willFinishLaunchingWithOptions:
and application:didFinishLaunchingWithOptions:
so if you change your code to:
- (BOOL)application:(UIApplication *)application willFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
UIViewController *viewController1 = [[[StateTestFirstViewController alloc] initWithNibName:@"StateTestFirstViewController" bundle:nil] autorelease];
UIViewController *viewController2 = [[[StateTestSecondViewController alloc] initWithNibName:@"StateTestSecondViewController" bundle:nil] autorelease];
self.tabBarController = [[[UITabBarController alloc] init] autorelease];
self.tabBarController.restorationIdentifier = @"TabBarController";
self.tabBarController.viewControllers = @[viewController1, viewController2];
self.window.rootViewController = self.tabBarController;
return YES;
}
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
[self.window makeKeyAndVisible];
return YES;
}
It worked for me. Also I recommend that you watch the WWDC 2012 Session 208 — Saving and Restoring Application State on iOS.