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

user_3026347 0
Viewed 43825

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

swift3 xcode ios
9 Answers
childViewControllers.forEach({
  $0.willMove(toParentViewController: nil)
  $0.view.removeFromSuperview()
  $0.removeFromParentViewController()
})

This answer is for swift 4.2 and above one is less than 4.2 versions.

children.forEach({
  $0.willMove(toParent: nil)
  $0.view.removeFromSuperview()
  $0.removeFromParent()
})

Here is the more concise version for removing all child controllers from the parent. You can use self.childViewControllers to define explicitly. As this approach, you can get rid of these extra conditions to check.

user_80385630

Swift 4.2 and above

create extension on UIViewController and add removeChild() method

extension UIViewController {
        
  func removeChild() {
    self.children.forEach {
      $0.willMove(toParent: nil)
      $0.view.removeFromSuperview()
      $0.removeFromParent()
    }
  }
}

Usage:

call removeChild from parent UIViewController

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)
    self.removeChild()
}
user_15708080

To add viewController:

let forgetPasswordVc = ForgetPasswordViewController()
self.addChild(forgetPasswordVc)
self.view.addSubview(forgetPasswordVc.view)
forgetPasswordVc.didMove(toParent: self)

To remove (inside the ForgetPasswordViewController):

self.removeFromParent()
self.view.removeFromSuperview()
user_81602520

Swift 4.2 , XCode 10 , ios 12 , 2018 Answer

self.children.forEach{$0.willMove(toParent: nil);$0.view.removeFromSuperview();$0.removeFromParent()}

Hope it is helpful to someone

user_46019000

Update for Swift 4

if self.children.count > 0{
    let viewControllers:[UIViewController] = self.children
    for viewContoller in viewControllers{
        viewContoller.willMove(toParent: nil)
        viewContoller.view.removeFromSuperview()
        viewContoller.removeFromParent()
    }
}
user_18723840 
  if self.childViewControllers.count > 0{
        let viewControllers:[UIViewController] = self.childViewControllers
        for viewContoller in viewControllers{
            viewContoller.willMove(toParentViewController: nil)
            viewContoller.view.removeFromSuperview()
            viewContoller.removeFromParentViewController()
        }
    }
user_18288450 
  if self.childControllers.count > 0{
           let viewControllers:[UIViewController] = self.childControllers
           for viewContoller in viewControllers{
               viewContoller.willMove(toParentViewController: nil)
               viewContoller.view.removeFromSuperview()
               viewContoller.removeFromParentViewController()
           }
       }
user_171141450
Related