问在iphone通用应用程序中未调用主AppDelegate

EN

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
  self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.

 if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
      self.viewController = //Initialize the ViewController for iPhone environment 
 } 
 else {
      self.viewController =  //Initialize the ViewController for iPad environment
 }
 self.navigationController = [[UINavigationController alloc] 
                             initWithRootViewController:self.viewController];
 [self.window addSubview:self.navigationController.view];
 [self.window makeKeyAndVisible];
 return YES;
}