viewDidAppear for tabbar based apps

问题

I'd like to do something when a particular tab appears. 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?

回答1:

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.

回答2:

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

来源：https://stackoverflow.com/questions/2758798/viewdidappear-for-tabbar-based-apps