IOS When a tab element is used, I need to check the condition to show another view controller

Question

In my application, I have a UITabBarController, when a user tapped on a tab item (e.g. tab index 3), I want to check one condition (if ...) to show another ViewController.

So my question is where to implement this condition function?

Answer 1

you need to set the UITabBarController delegate as shown below:

 func tabBarController(tabBarController: UITabBarController, didSelectViewController viewController: UIViewController) { if viewController is TabBarDelegate { let v = viewController as! TabBarDelegate v.didSelectTab(self) } } 

Answer 2

try creating a tab by button, and view is scrollview