UITabBarController Set a Default Tab in Swift Lang

问题:

I have a UITabBarController that has 5 different view controllers attached to it. Each one has there own specific tab such as Home, Settings, etc. How can i set a certain tab to be the default tab when launched?

回答1:

Is there a specific reason why you can't move your chosen first tab to be presented to the left most slot?

self.tabBarController.selectedIndex = desiredIndex

or, if you're code is in a UITabBarConroller subclass, simply:

 selectedIndex = desiredIndex

should work.

回答2:

You could consider changing the tab in the app delegate's didFinishLaunchingWithOptions (or whatever owns the tab bar controller) with code like this:

if let tabController = window?.rootViewController as? UITabBarController {
        tabController.selectedIndex = 1
    }