获取WKWebView中的链接URL

Question

我想在WKWebView获得一个tapped链接的网址。链接采用自定义格式，可触发应用中的某些操作。例如http://my-site/help#deeplink-intercom。我这样使用KVO：

override func loadView() {
        let webConfiguration = WKWebViewConfiguration()
        webView = WKWebView(frame: .zero, configuration: webConfiguration)
        webView.navigationDelegate = self
        webView.addObserver(self, forKeyPath: "URL", options: .new, context: nil)
        view = webView
    }

 override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
        if let newValue = change?[.newKey] {
            print("url changed: \(newValue)")
        }
        print("Did tap!!")
    }

这在第一次点击链接时效果很好。但是，如果我连续两次点击相同的链接，它将不会报告链接点击（显然因为实际值没有改变）。是否有解决方法来解决这个问题，以便我可以检测每个点击并获取链接？任何关于这个的指针都会很棒！谢谢！

Answer 1

像这样改变addObserver

webView.addObserver(self, forKeyPath: "URL", options: [.new, .old], context: nil)

在observeValue函数中你可以获得两个值

override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
    if let newValue = change?[.newKey] as? Int, let oldValue = change?[.oldKey] as? Int, newValue != oldValue {
        //Value Changed
        print(change?[.newKey])
    }else{
        //Value not Changed
        print(change?[.oldKey])
    }
}

Answer 2

您可以使用WKWebView委托方法。并且不要忘记将webview委托设置为self：webview.navigationDelegate = self

func webView(webView: WKWebView, decidePolicyForNavigationAction navigationAction: WKNavigationAction, decisionHandler: ((WKNavigationActionPolicy) -> Void)) {

    switch navigationAction.navigationType {
        case .LinkActivated:
        if navigationAction.targetFrame == nil {
            self.webView?.loadRequest(navigationAction.request)// It will load that link in same WKWebView
        }
        default:
            break
    }

    if let url = navigationAction.request.URL {
        print(url.absoluteString) // It will give the selected link URL

    }
    decisionHandler(.Allow)
}

Answer 3

Swift 5.0

请记住在WKWebView实例上设置navigationDelegate。

func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) {
    print(String(describing: navigationAction))
    decisionHandler(.allow)
}