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How to run JavaScript on a WKWebView with evaluateJavaScript()

Written by Paul Hudson    @twostraws

Using evaluateJavaScript() you can run any JavaScript in a WKWebView and read the result in Swift. This can be any JavaScript you want, which effectively means you can dig right into a page and pull out any kind of information you want.

Here's an example to get you started:

webView.evaluateJavaScript("document.getElementById('someElement').innerText") { (result, error) in
    if error != nil {
        print(result)
    }
}

Available from iOS 8.0 – see Hacking with Swift tutorial 4

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