WKWebView Content loaded function never get called - ios

Question

i try to get a function called after my Content inside WKWebView is fully loaded. I found the "didFinishNavigation" function at the Apple Swift WKNavigation Documentation.
func webView(webView: WKWebView!, didFinishNavigation navigation: WKNavigation!) {
println("WebView content loaded.")
}
But the function never get called.
import UIKit
import WebKit
class ViewController: UIViewController WKNavigationDelegate {
override func loadView() {
super.loadView()
self.webView = WKWebView(frame:self.containerView.frame, configuration: WKWebViewConfiguration())
self.containerView.addSubview(webView!)
self.containerView.clipsToBounds = true
}
override func viewDidLoad() {
super.viewDidLoad()
var url = NSURL(string:"http://google.com/")
var req = NSURLRequest(URL:url)
self.webView!.loadRequest(req)
}
func webView(webView: WKWebView!, didFinishNavigation navigation: WKNavigation!) {
println("WebView content loaded.")
}
}

Answer 1

You are not setting the navigationDelegate. Set it and it should be fine.
class ViewController: UIViewController, WKNavigationDelegate {
override func viewDidLoad() {
super.viewDidLoad()
let noLayoutFormatOptions = NSLayoutFormatOptions(rawValue: 0)
let webView = WKWebView(frame: CGRectZero, configuration: WKWebViewConfiguration())
webView.setTranslatesAutoresizingMaskIntoConstraints(false)
webView.navigationDelegate = self
view.addSubview(webView)
view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:|[webView]|", options: noLayoutFormatOptions, metrics: nil, views: ["webView": webView]))
view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|[webView]|", options: noLayoutFormatOptions, metrics: nil, views: ["webView": webView]))
let url = NSURL(string: "http://google.com")
let request = NSURLRequest(URL: url)
webView.loadRequest(request)
}
func webView(webView: WKWebView!, didFinishNavigation navigation: WKNavigation!) {
print("Finished navigating to url \(webView.url)");
}
}
And here is a bit better version with Swift 3.
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let configuration = WKWebViewConfiguration()
let webView = WKWebView(frame: .zero, configuration: configuration)
webView.translatesAutoresizingMaskIntoConstraints = false
webView.navigationDelegate = self
view.addSubview(webView)
[webView.topAnchor.constraint(equalTo: view.topAnchor),
webView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
webView.leftAnchor.constraint(equalTo: view.leftAnchor),
webView.rightAnchor.constraint(equalTo: view.rightAnchor)].forEach { anchor in
anchor.isActive = true
}
if let url = URL(string: "https://google.com/search?q=westworld") {
webView.load(URLRequest(url: url))
}
}
}
extension ViewController: WKNavigationDelegate {
func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
print("Finished navigating to url \(webView.url)")
}
}

Answer 2

I made a simple mistake for not adding a subview to my View
view.addSubview(webView)
I have created a webView programmatically, here is the complete code
1.. import WebKit
2.. func viewDidLoad()
let request = URLRequest(url: url)
let webView = WKWebView(frame: view.frame)
view.addSubview(webView)
webView.navigationDelegate = self
webView.load(request)
3.. Implement extension for delegate methods
// MARK: WKWebView
extension ViewController: WKNavigationDelegate {
func webView(_ webView: WKWebView, didStartProvisionalNavigation navigation: WKNavigation!) {
print("Start Request")
}
func webView(_ webView: WKWebView, didFail navigation: WKNavigation!, withError error: Error) {
print("Failed Request")
}
func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
print("Finished Request")
}