I need write some code to switch the view to another tab when the iOS app starts (so, for example, the second tab is shown by default rather than the first).
I'm new to Swift, and have worked out the following:
The code should probably go in the override func viewDidLoad() function of the ViewController of the first tab.
The following code shows the second ViewController, but not with the tab bar at the bottom (vcOptions is the second ViewController tab item:
let vc : AnyObject! = self.storyboard.instantiateViewControllerWithIdentifier("vcOptions")
self.showViewController(vc as UIViewController, sender: vc)
I think the answer may lie in using the UITabbarController.selectedIndex = 1, but not quite sure how to implement this.
If your window
rootViewController
is UITabbarController
(which is in most cases) then you can access tabbar
in didFinishLaunchingWithOptions
in the AppDelegate
file.
func application(application: UIApplication!, didFinishLaunchingWithOptions launchOptions: NSDictionary!) -> Bool {
// Override point for customization after application launch.
if let tabBarController = self.window!.rootViewController as? UITabBarController {
tabBarController.selectedIndex = 1
}
return true
}
This will open the tab with the index
given (1) in selectedIndex
.
If you do this in viewDidLoad
of your firstViewController
, you need to manage by flag or another way to keep track of the selected tab. The best place to do this in didFinishLaunchingWithOptions
of your AppDelegate
file or rootViewController
custom class viewDidLoad
.