viewDidAppear for tabbar based apps

I'd like to do something when a particular tab appears. 开发者_StackOverflow社区 Meaning, the user has clicked the tab view's tab button. viewDidAppear doesn't fire when this happens. How else can I hook into the tab click event?

You can implement this

- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController{
  [viewController viewDidAppear:YES];
}

in your Tab Bar Delegate, so your viewDidAppear method will be called properly.

Implement -tabBarController:didSelectViewController: in your tab bar delegate.