WKWebView, scrolling the web page to top

Question

I tried this, which should work but doesn't:

webView.scrollView.setContentOffset(CGPoint(x: 0, y: 0), animated: false)

I am working on a browser and have a couple of webViews in kept in stack. Some sites work as expected, start at the top, some do not.

Starts at top: http://leagueoflegends.com/

This one starts a little down, have to manually scroll up: http://euw.leagueoflegends.com/

Extra note, this problem never happens to the first webView. Even if I load the 2nd link and show it as first webView, it doesn't scroll to the middle.

Answer 1

I encountered this too. Finally, I fixed this way:

if #available(iOS 11, *) {
    webView.scrollView.contentInsetAdjustmentBehavior = .never
}

If you have this issue on iOS 11, try this.

Answer 2

Before iOS 11.0, UIWebView was avilable with delegates to indicate that loading of webView is finished and we can do any operation after loading has been finished.

Now we have WKWebView which doesn't provide any delegate method to notify once your webView has finished loading. Due to this if we do following piece of code then it will not work:

let myURL = URL(string: "https://www.google.com")
let myRequest = URLRequest(url: myURL!)
webView.load(myRequest)
webView.scrollView.setContentOffset(CGPoint(x: 0, y: 0), animated: false)

In this case, webView.load() is a asynchronous function which gets called and code moves further without waiting for its completion. Due to this your call for setContentOffset work but after that when webView finish loading it reset the ContentOffset to default, which is actually (0,0) but I am not sure why your WebView doesn't load from top. But doing code in following manner will may help you:

Extend to WKNavigationDelegate and implement didFinish navigation method in your ViewController and call setContentOffset in that method.

class ViewController: UIViewController, WKNavigationDelegate {

      override func viewDidLoad() {
          let myURL = URL(string: "https://www.google.com")
          let myRequest = URLRequest(url: myURL!)
          webView.load(myRequest)
          webView.navigationDelegate = self
      }

      func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
        webView.scrollView.setContentOffset(CGPoint(x: 0, y: 0), animated: false)
      }
}