Pass Value from iOS to uiWebView

Question

I can successfully obtain a variable from javascript and display it as an alert message in an iOS app as follows:

    let loggedIn = self.webView.stringByEvaluatingJavaScript(from: "loggedIn");

    let alertController = UIAlertController(title: "iOScreator", message:
        loggedIn, preferredStyle: UIAlertControllerStyle.alert)
    alertController.addAction(UIAlertAction(title: "Dismiss", style: UIAlertActionStyle.default,handler: nil))

    self.present(alertController, animated: true, completion: nil)

The above works perfectly. Is there a similar option to pass a variable from iOS to a javascript variable and run a function that does a pop alert with that variable?

Any help, as always, is appreciated. Many thanks, Alan.

passing "loggedIn=true" will set loggedIn as true. similar way you can even call functions with parameters if you want. for reference https://stackoverflow.com/questions/3641968/passing-objective-c-variable-to-javascript-in-ios — Surya Subenthiran, May 26 '17 at 14:20
Many thanks. Did not realise it was that simple. Feel free to put it as the answer. If you could pop an example of swift 3 and the function with parameter that would be great :) — Alan Tingey, May 26 '17 at 14:27

score 3 · Accepted Answer · answered May 26 '17 at 14:32

3

Swift code to call javascript method

self.webView.stringByEvaluatingJavaScript(from: "myFunction('param')")

javascript method

function myFunction(param)
{
    alert(param);
}

Reference passing objective c variable to javascript in ios

Hope this helps.

answered May 26 '17 at 14:32

Surya Subenthiran

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Pass Value from iOS to uiWebView

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