WKWebView not resizing when content changing - ios

Question

WKWebView is not resizing when content changing.
Here is a code snippet:
#IBOutlet weak var containingView: UIView!
var webView: WKWebView!
override func viewDidLoad()
{
super.viewDidLoad()
let contentController = WKUserContentController();
self.webView = WKWebView(frame: CGRectMake(0, 0, self.view.frame.width, self.view.frame.height), configuration: WKWebViewConfiguration())
self.webView.autoresizingMask = [.FlexibleHeight]
self.webView.loadHTMLString(__, baseURL: __))
self.webView.scrollView.bounces = false
self.webView.scrollView.scrollEnabled = false
self.containingView.addSubview(self.webView)
}
What func should be added so I could intercept content size being changed and change the containingView size accordingly?

Answer 1

func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
print("webview did enter did finish navigation")
webView.evaluateJavaScript("document.readyState", completionHandler: { (complete, error) in
if complete != nil {
webView.evaluateJavaScript("document.body.scrollHeight", completionHandler: { (result, error) in
if let heightOfContent = result as? CGFloat {
}
})
}
})
}

Answer 2

What halped me was to have small initial WKWebView height
webView = WKWebView(frame: CGRectMake(0, 0, self.view.frame.width, 150), configuration: configuration)
instead of
webView = WKWebView(frame: CGRectMake(0, 0, self.view.frame.width, self.view.frame.height), configuration: configuration)

Answer 3

Conceptually in objective c you should do like below.
Two things:
Make sure to have these properties:
self.webView.scalesPageToFit = YES;
self.webView.contentMode = UIViewContentModeScaleAspectFit;
And finally calculate webView content height as :-
webView.isLoading is one of the most important property. Actually in a single call to a web url it is called multiple times.
- (void)webViewDidFinishLoad:(UIWebView *)webView{
if (webView.isLoading == NO)// as it is called multiple times so wait untill last call
{
CGFloat height = [[webView stringByEvaluatingJavaScriptFromString:#"document.height"] floatValue];
}
}
This is how you should compute web view height.
you can have a look here as WKWebView don't have a delete which you can use to get content size instead use KVO:
KVO example
May be it will help you more!