ios swift uistackview update children height and x, y frame position values

Question

I have a tableview cell with a layout like this -

ContentView 
   - StackView
       - Fixed Height UILabel
       - UIView (Webview Container)
       - Fixed Height UILabel
       - ... more views

Now I am trying to add a webview inside this UIView like this -

func prepareQuestionWebView() {
        let webConfiguration = WKWebViewConfiguration()
        let contentController = WKUserContentController();
        webConfiguration.userContentController = contentController
        webView = WKWebView(frame: CGRect(origin: CGPoint.zero, size: questionView.frame.size))
        webView?.scrollView.isScrollEnabled = false
        webView?.scrollView.bounces = false
        webView?.scrollView.bouncesZoom = false
        webView?.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        webView?.translatesAutoresizingMaskIntoConstraints = false
        webView?.tag = -1
        webView?.navigationDelegate = self
        questionView.removeAllSubviews()
        questionView.addSubview(webView!)
        webView?.contentScaleFactor = 1
    }

I have created the following outlets for my stack view and webview container -

@IBOutlet weak var questionView: UIView!
@IBOutlet weak var rootStack: UIStackView!

and to make the questionView frame size as equal to the webview's content size I am doing this -

func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
        if webView.isLoading == false {
            DispatchQueue.main.asyncAfter(deadline: .now() + 1.0) { 
               webView.evaluateJavaScript("document.body.scrollHeight", completionHandler: { (result, error) in
                    if let height = result as? CGFloat {
                        self.setHeightData(height, webView)
                    }
                })
            }
        }
    }

    func setHeightData(_ height: CGFloat, _ wv: WKWebView) {
        switch wv.tag {
            case -1:
                questionView.frame = CGRect.init(x: 0, y: 36, width: rootStack.frame.width, height: height)
            default:
                break
        }
        wv.layoutSubviews()
        questionView.layoutIfNeeded()
        rootStack.layoutSubviews()
        rootStack.layoutIfNeeded()
    }

This updates the webview size and its container's size but for some reason the elements after the webview container in the stackview are not updated and hence they overlap with the webview container

So, how can I update the stackview view after I set the questionView's height equal to its webview's contents ?

Or is there another way to make the questionView (webview container) height dynamic according to its content and make the rest of the views move down when its height changes ?

Answer 1

You have set the stackview and other view's size using autolayout and you are setting webview and container view's size using frames. Because of this, stackview and other views inside it are unable to adjust. Rather than giving webview's container a frame, constraint its four walls to webview's four walls and give the webview a height constraint.