I use WKWebView to load my webpage. When user click a button in webpage, my webpage will open a custom schema URL (e.g. asfle://download?media_id=1). And I use KVO to observe WKWebView's URL property to get the URL. It works well in iOS 9, but it doesn't work in iOS 10. I can't get the url. I use Xcode 8, swift 2.3.
override func viewDidLoad() {
super.viewDidLoad()
webView.addObserver(self, forKeyPath: "URL", options: .New, context: nil)
}
override func observeValueForKeyPath(keyPath: String?,
ofObject object: AnyObject?,
change: [String : AnyObject]?,
context: UnsafeMutablePointer<Void>)
{
print("url:\(webView.URL)")
}
In iOS 9, it can print url. But in iOS 10 only the website's url get printed, when user touch the button in webpage, nothing get printed.
You can still observe WKWebView
's url
property, just be sure to hold a strong reference to the returned observation:
class ViewController: UIViewController {
var webView: WKWebView!
var urlObservation: NSKeyValueObservation?
override func viewDidLoad() {
super.viewDidLoad()
// ...Initialize web view.
webView = WKWebView(frame: view.bounds, configuration: WKWebViewConfiguration())
webView.autoresizingMask = [.flexibleHeight, .flexibleWidth]
view.addSubview(webView)
// Add observation.
urlObservation = webView.observe(\.url, changeHandler: { (webView, change) in
NSLog("Web view URL changed to \(webView.url?.absoluteString ?? "Empty")")
})
}
}
Also, don't forget to capture self
as weak
in observation closure if you plan to use it there, as otherwise you will get a retain cycle.
I found the solution. Instead of using KVO, use delegate to detect opening URL.
override func viewDidLoad() {
super.viewDidLoad()
webView.navigationDelegate = self
}
func webView(webView: WKWebView, decidePolicyForNavigationAction navigationAction: WKNavigationAction, decisionHandler: (WKNavigationActionPolicy) -> Void) {
print("url:\(navigationAction.request.URL)")
decisionHandler(.Allow)
}
I found the optional solution.I have get same problem and change this line
webview.addObserver(self, forKeyPath: #keyPath(WKWebView.estimatedProgress), options:.new, context: nil)
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