UITabBarController委托在UIViewContoller中选择了Item

Question

我在appdelegate.m中添加了UITabBarController。请检查以下代码

 DiViewController *contact  = [[DiViewController alloc] initWithNibName:@"DiViewController" bundle:nil];
    UINavigationController *contactNav =  [[UINavigationController alloc] initWithRootViewController:contact];
    contactNav.navigationBar.barStyle = UIBarStyleBlack;


    self.tabController = [[UITabBarController alloc] init];
    CGRect tabframe = self.tabController.tabBar.frame;
    tabframe.origin.y -= 10;
    tabframe.size.height += 10;
    self.tabController.tabBar.frame = tabframe;
    self.tabController.delegate = self;
    self.tabController.viewControllers = @[contactNav];

然后我在模拟器底部标签栏中打开了arun DiViewController.xib。然后我点击了在appdeletgate.m中工作的tabbar item.didSelectViewController。但我想在DiViewController.m。我可以在DiViewController.m中获得didSelectViewController。我在DiViewController.m中使用了以下相同但不起作用。

- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController{



}