[SOLVED] Javascript call to Swift from UIWebView

Javascript call to Swift from UIWebView

I am trying to make a call from a javascript function in a UIWebView to Swift in iOS 10. I have setup a very basic project just to try and get this working, the code is below.

import UIKit

class ViewController: UIViewController, UIWebViewDelegate  {    
  @IBOutlet var webView: UIWebView!

    override func viewDidLoad() {
        super.viewDidLoad()

        let url = Bundle.main.url(forResource: "products", withExtension: "html")
        let request = NSURLRequest(url: url! as URL)
        webView.loadRequest(request as URLRequest)
    }

    @IBAction func closeDocumentViewer() {
        displayView.isHidden = true;
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
}

If I just one to receive a string from a javascript function what would I have to add to the above?

Solution

You must a custom URL Scheme such as myawesomeapp and intercept requests to it using:

func webView(webView: UIWebView, shouldStartLoadWithRequest request: NSURLRequest, navigationType: UIWebViewNavigationType) -> Bool

Fire a call to native code using window.location=myawesomeapp://hello=world, and get the query params you pass from request.URL.query in the native code.

For more information, see my question about UIWebViews here: JavaScript synchronous native communication to WKWebView