What is the correct way to remove a subview from a view hierarchy and nuke it?

Question

I have a parent UIView with a number of subviews. Periodically I need to remove a subview and completely remove it from the system. What is the correct way to do this? I tried t

Answer 1

That's the right general idea. those other UIViews that disappear, what's their relationship to this UIView? Are they subviews of this view? Are they dealloc'd in the dealloc method of the view you're removing?

Are you sure your Tags are unique?

Sujal

Answer 2

    override func viewWillAppear(_ animated: Bool)
    {
        super.viewWillAppear(animated)

        if let topController = UIApplication.topViewController() {

            if topController.isKind(of: ProviderHome.self)
            {
                let arrOfSuview = self.view.subviews

                if arrOfSuview.count > 1
                {
                    print("Davender Arr of subviews : \(arrOfSuview)")

                    for i in 0..<arrOfSuview.count
                    {
                        let objSub = arrOfSuview[i]

                        if objSub.tag == 101
                        {
                          objSub.removeFromSuperview()
                        }

                    }



                }


                NotificationCenter.default.addObserver(self, selector: #selector(ProviderHome.handelPushNotification), name: NSNotification.Name(rawValue: "handelPush"), object: nil)

                NotificationCenter.default.addObserver(self, selector: #selector(ProviderHome.handelLocalNotification), name: NSNotification.Name(rawValue: "handelLocal"), object: nil)
            }
        }


    }

@objc func handelPushNotification(_ notification: NSNotification)  {


        let arrOfSuview = self.view.subviews

        if arrOfSuview.count > 1
        {
            print("Davender Arr of subviews : \(arrOfSuview)")

            for i in 0..<arrOfSuview.count
            {
                let objSub = arrOfSuview[i]

                if objSub.tag == 101
                {
                    objSub.removeFromSuperview()
                }

            }

        }

        if notification.userInfo != nil
        {


            let dict = notification.userInfo as! Dictionary<String, Any>

            let d = dict["data"] as! Dictionary<String, Any>

            let action = d["gcm.notification.label"] as! String

            print("current message id :- ", action)

            self.getNotificationId = action

            if getNotificationId != ""
            {
               //call the api for getting Data

                AppDelegate.sharedInstance().myCurrentnotificationId = getNotificationId

                //working code
                let storyboard = UIStoryboard(name: "Provider", bundle: nil)
                let vc = storyboard.instantiateViewController(withIdentifier: "CommonPopUpsVC") as! CommonPopUpsVC
                vc.modalPresentationStyle = .overFullScreen
                vc.view.frame = self.view.frame
                vc.view.tag = 101
                self.view.addSubview(vc.view)
                self.present(vc, animated: true, completion: nil)

            }


       }
    }

Answer 3

Is it possible that cell.contentView has the same tag as the subview you want to remove? according to the documentation viewWithTag removes:

The view in the receiver’s hierarchy that matches tag. The receiver is included in the search.

If this is the case then you may be inadvertently removing cell.contentView from the cell. If n is zero and your cell's contentview has no tag set to it, it would default to 0 and cause that to happen.

Answer 4

Swift 3.0:

let viewToRemove = mySuperView.viewWithTag(myTag)
viewToRemove?.removeFromSuperview()

Answer 5

To remove all subviews from your view:

for(UIView *subview in [view subviews]) {
   [subview removeFromSuperview];
}

If you want to remove some specific view only then:

for(UIView *subview in [view subviews]) {
  if([subview isKindOfClass:[UIButton class]]) {
     [subview removeFromSuperview];
 } else {
     // Do nothing - not a UIButton or subclass instance
 }
}

You can also delete sub views by tag value:

for(UIView *subview in [view subviews]) {
    if(subview.tag==/*your subview tag value here*/) {
        [subview removeFromSuperview];

    } else {
        // Do nothing - not a UIButton or subclass instance
    }
}

Answer 6

Swift 4: extend UIView

extension UIView {
    public func removeAllSubviews() {
        for subview in self.subviews {
            subview.removeFromSuperview()
        }
    }
}

or

extension UIView {
    public func removeAllSubviews() {
        self.subviews.forEach { $0.removeFromSuperview() }
    }
}