Xcode 9 GM - WKWebView NSCoding support was broken in previous versions

Does anyone know how to fix this error with Xcode 9 GM? I'm working on an app made with Xcode 8.3, the deployment target is for iOS 9.3 and I never had this problem before. I don't find any information here or on Apple forums yet :(

Edit: This error came when I put a WKWebView into interface builder, not if I use it programmatically.

Edit 2: Well, it's finally not a bug, see Quinn's answer below to have more information about this behavior. Thanks to him for the explanation.

The error is correct behavior, and not a bug in Xcode 9. Although WKWebView was introduced in iOS 8, there was a bug in -[WKWebView initWithCoder:] that was only fixed in iOS 11, which always crashed at runtime and thus prevented configuring one within Interface Builder.

https://bugs.webkit.org/show_bug.cgi?id=137160

Rather than allow developers to build something in IB that would be broken at runtime, it is a build error. It's an inconvenient limitation since iOS 11 was only recently released, but there's really no other good option.

The workaround for older deployment targets is to continue to add the WKWebView in code, as @fahad-ashraf already described in his answer:

https://developer.apple.com/documentation/webkit/wkwebview

This seems to be a bug in Xcode 9 and was also present in the betas. You will only get the build error if you are creating a WKWebView through the storyboard. If you progmatically create the WKWebView in the corresponding ViewController class file, you should be able to build on iOS versions below iOS 11. Here is the approach given on Apple's website for how to accomplish this:

import UIKit
import WebKit
class ViewController: UIViewController, WKUIDelegate {

    var webView: WKWebView!

    override func loadView() {
        super.loadView()
        let webConfiguration = WKWebViewConfiguration()
        webView = WKWebView(frame: .zero, configuration: webConfiguration)
        webView.uiDelegate = self
        view = webView
    }
    override func viewDidLoad() {
        super.viewDidLoad()

        let myURL = URL(string: "https://www.apple.com")
        let myRequest = URLRequest(url: myURL!)
        webView.load(myRequest)
    }}

You should then be able to implement WKWebView functionality as you normally would.

Source: https://developer.apple.com/documentation/webkit/wkwebview

If you want to realize a custom UIViewController with other components in addition you can make a "container" through the storyboard called for example webViewContainer:

import UIKit
import WebKit
class ViewController: UIViewController, WKUIDelegate {
    @IBOutlet weak var webViewContainer: UIView!
    var webView: WKWebView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        let webConfiguration = WKWebViewConfiguration()
        let customFrame = CGRect.init(origin: CGPoint.zero, size: CGSize.init(width: self.webViewContainer.frame.size.width, height: self.webViewContainer.frame.size.height))
        self.webView = WKWebView (frame: customFrame , configuration: webConfiguration)
        webView.translatesAutoresizingMaskIntoConstraints = false
        self.webViewContainer.addSubview(webView)
        webView.topAnchor.constraint(equalTo: webViewContainer.topAnchor).isActive = true
        webView.rightAnchor.constraint(equalTo: webViewContainer.rightAnchor).isActive = true
        webView.leftAnchor.constraint(equalTo: webViewContainer.leftAnchor).isActive = true
        webView.bottomAnchor.constraint(equalTo: webViewContainer.bottomAnchor).isActive = true
        webView.heightAnchor.constraint(equalTo: webViewContainer.heightAnchor).isActive = true
        webView.uiDelegate = self
        
        let myURL = URL(string: "https://www.apple.com")
        let myRequest = URLRequest(url: myURL!)
        webView.load(myRequest)
    }