CODEWITHSUNDEEP
iosswiftuitabbarcontroller
Coffee inTime
Coffee inTime

Reputation: 230

Transfer data from tab bar controller to ViewController

I have a typical ViewController:

class ViewController: UIViewController{
override func viewDidLoad() {}
}

And I also have TabBarController which displays me the number of the current scene:

class TabBarController: UITabBarController {
  override func tabBar(_ tabBar: UITabBar, didSelect item: UITabBarItem!) {
    if item == (self.tabBar.items as! [UITabBarItem])[0]{
      print(1)
    }
    else if item == (self.tabBar.items as! [UITabBarItem])[1]{
      print(2)
    }
  }

}

I need my ViewController to know the number of its scene. (1 or 2). How can I deliver him this number for use from TabBarController?

Upvotes: 0

Views: 457

Answers (1)

David Chopin
David Chopin

Reputation: 3064

What you want to do is, add a property called number, or whatever you like, to your ViewController class.

class ViewController: UIViewController {
  var number: Int!
}

Then in tabBarController's viewDidLoad, loop through the view controllers, check if they are of type ViewController, and then set their number property to the index of the tabBarController's view controllers:

class TabBarController: UITabBarController {

  override func viewDidLoad() {
    super.viewDidLoad()
    for (index,vc) in (viewControllers!.enumerated())! {
      if let viewController = vc as? ViewController {
        vc.number = index
      }
    }
  }

  override func tabBar(_ tabBar: UITabBar, didSelect item: UITabBarItem!) {
    if item == (self.tabBar.items as! [UITabBarItem])[0]{
      print(1)
    }
    else if item == (self.tabBar.items as! [UITabBarItem])[1]{
      print(2)
    }
  }

}

Unless, are you wanting to set the value whenever the tab is selected?

Upvotes: 1

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