How to remove the ChildViewController from Parent View Controller in Swift 3

Question

I am developing an IOS Application. I have added the UIViewController in View Pager. I want to reinitialize it when the language is changed. Here I want to remove all child UIViewController from UIViewPager and again back to add all UIViewController into Viewpager. How can I do that?

Sample Code

let viewPager = ViewPagerController()
viewPager.options = options
viewPager.dataSource = self
viewPager.delegate = self
self.addChildViewController(viewPager)

Swift 3.1

xcode 8.3.3

Answer 1

After the long search to remove the view controllers from viewpager. I did it in the following way.

 if self.childViewControllers.count > 0{
        let viewControllers:[UIViewController] = self.childViewControllers
        for viewContoller in viewControllers{
            viewContoller.willMove(toParentViewController: nil)
            viewContoller.view.removeFromSuperview()
            viewContoller.removeFromParentViewController()
        }
    }

here self is , Current UIViewController which has View Pager. I need to remove all the childview controllers from the view pager. So, i get the list of view controllers from Current UIViewController. Then i removed it from the Parent view.

For swift 4.2

 if self.children.count > 0{
        let viewControllers:[UIViewController] = self.children
        for viewContoller in viewControllers{
            viewContoller.willMove(toParent: nil)
            viewContoller.view.removeFromSuperview()
            viewContoller.removeFromParent()
        }
    }

EDIT

Remove top childview controller:

   func removeTopChildViewController(){
         if self.children.count > 0{
             let viewControllers:[UIViewController] = self.children
                viewControllers.last?.willMove(toParent: nil)
                viewControllers.last?.removeFromParent()
                viewControllers.last?.view.removeFromSuperview()
         }
     }