用NavigationBar替换TabbarController中的一个ViewController

Question

I noticed in Whatsapp there are four tabs. If you disable the access to Contacts, the view in first tab, Favorites, will be replaced with the information view which will guide user to open the Settings.

I was trying to copy this function with following codes (in AppDelegate):

let gotoSettingsVC = UIApplication.sharedApplication().keyWindow?.rootViewController!.storyboard?.instantiateViewControllerWithIdentifier("gotoSettingsViewController") as! GotoSettingsViewController
let tabbarController = UIApplication.sharedApplication().keyWindow?.rootViewController! as! UITabBarController

gotoSettingsVC.tabBarItem = tabbarController.tabBar.selectedItem
tabbarController.viewControllers![tabbarController.selectedIndex] = gotoSettingsVC

The gotoSettingsVC can be shown correct but without Navigation Bar. How to show this View with a Navigation Bar like the normal View in tabbarController?

thank you for any help.

Answer 1

将GotoSettingsViewController嵌入导航控制器中，并将其设置为tabBar控制器视图控制器之一。