Getting invokeUndefinedMethodFromWebScript to work in Swift

I am trying to get Javascript-Swift interface work with WKWebView and someone seems to have got it working here.

However I am unable to get it working in Swift (I am new to Swift and newer to Obj-C). I tried following code in ViewController.swift with WKWebView added to Main.storyboard and connected:

import WebKit



class ViewController: NSViewController, WKUIDelegate {

    @IBOutlet weak var wkWebView: WKWebView!

    override func viewDidLoad() {

        super.viewDidLoad()

        let url = URL(string: "http://127.0.0.1:8080")

        let request = URLRequest(url: url!)

        wkWebView!.configuration.preferences.javaScriptEnabled = true

        wkWebView!.load(request)

    }

}



extension WKWebView {

    open override func invokeUndefinedMethod(fromWebScript name: String!, withArguments arguments: [Any]!) -> Any! {

        return "Hello From Swift"

    }

}

and on HTML side:

<html>

  <body>

    <p>Hello World</p>

    <input type=text id='i'/>

    <input type=button value='Submit' onclick='document.getElementById("i").value = window.external.MY_ObjectiveCFunction();'>

  </body>

</html>

But when I click on Submit button nothing happens. If I use document.getElementById("i") = "hello", it works though. @ctrlspace seems to have got it working somehow (See link above).

Any ideas?

edited Jan 19 at 6:21

asked Jan 19 at 6:10

arun siara.cc

11911

add a comment |

I am trying to get Javascript-Swift interface work with WKWebView and someone seems to have got it working here.

However I am unable to get it working in Swift (I am new to Swift and newer to Obj-C). I tried following code in ViewController.swift with WKWebView added to Main.storyboard and connected:

import WebKit



class ViewController: NSViewController, WKUIDelegate {

    @IBOutlet weak var wkWebView: WKWebView!

    override func viewDidLoad() {

        super.viewDidLoad()

        let url = URL(string: "http://127.0.0.1:8080")

        let request = URLRequest(url: url!)

        wkWebView!.configuration.preferences.javaScriptEnabled = true

        wkWebView!.load(request)

    }

}



extension WKWebView {

    open override func invokeUndefinedMethod(fromWebScript name: String!, withArguments arguments: [Any]!) -> Any! {

        return "Hello From Swift"

    }

}

and on HTML side:

<html>

  <body>

    <p>Hello World</p>

    <input type=text id='i'/>

    <input type=button value='Submit' onclick='document.getElementById("i").value = window.external.MY_ObjectiveCFunction();'>

  </body>

</html>

But when I click on Submit button nothing happens. If I use document.getElementById("i") = "hello", it works though. @ctrlspace seems to have got it working somehow (See link above).

Any ideas?

edited Jan 19 at 6:21

asked Jan 19 at 6:10

arun siara.cc

11911

add a comment |

I am trying to get Javascript-Swift interface work with WKWebView and someone seems to have got it working here.

However I am unable to get it working in Swift (I am new to Swift and newer to Obj-C). I tried following code in ViewController.swift with WKWebView added to Main.storyboard and connected:

import WebKit



class ViewController: NSViewController, WKUIDelegate {

    @IBOutlet weak var wkWebView: WKWebView!

    override func viewDidLoad() {

        super.viewDidLoad()

        let url = URL(string: "http://127.0.0.1:8080")

        let request = URLRequest(url: url!)

        wkWebView!.configuration.preferences.javaScriptEnabled = true

        wkWebView!.load(request)

    }

}



extension WKWebView {

    open override func invokeUndefinedMethod(fromWebScript name: String!, withArguments arguments: [Any]!) -> Any! {

        return "Hello From Swift"

    }

}

and on HTML side:

<html>

  <body>

    <p>Hello World</p>

    <input type=text id='i'/>

    <input type=button value='Submit' onclick='document.getElementById("i").value = window.external.MY_ObjectiveCFunction();'>

  </body>

</html>

But when I click on Submit button nothing happens. If I use document.getElementById("i") = "hello", it works though. @ctrlspace seems to have got it working somehow (See link above).

Any ideas?

edited Jan 19 at 6:21

asked Jan 19 at 6:10

arun siara.cc

11911

I am trying to get Javascript-Swift interface work with WKWebView and someone seems to have got it working here.

However I am unable to get it working in Swift (I am new to Swift and newer to Obj-C). I tried following code in ViewController.swift with WKWebView added to Main.storyboard and connected:

import WebKit



class ViewController: NSViewController, WKUIDelegate {

    @IBOutlet weak var wkWebView: WKWebView!

    override func viewDidLoad() {

        super.viewDidLoad()

        let url = URL(string: "http://127.0.0.1:8080")

        let request = URLRequest(url: url!)

        wkWebView!.configuration.preferences.javaScriptEnabled = true

        wkWebView!.load(request)

    }

}



extension WKWebView {

    open override func invokeUndefinedMethod(fromWebScript name: String!, withArguments arguments: [Any]!) -> Any! {

        return "Hello From Swift"

    }

}

and on HTML side:

<html>

  <body>

    <p>Hello World</p>

    <input type=text id='i'/>

    <input type=button value='Submit' onclick='document.getElementById("i").value = window.external.MY_ObjectiveCFunction();'>

  </body>

</html>

But when I click on Submit button nothing happens. If I use document.getElementById("i") = "hello", it works though. @ctrlspace seems to have got it working somehow (See link above).

Any ideas?

ios swift xcode macos wkwebview

edited Jan 19 at 6:21

asked Jan 19 at 6:10

arun siara.cc

11911

edited Jan 19 at 6:21

asked Jan 19 at 6:10

arun siara.cc

11911

edited Jan 19 at 6:21

asked Jan 19 at 6:10

arun siara.cc

11911

asked Jan 19 at 6:10

arun siara.cc

11911

asked Jan 19 at 6:10

arun siara.cc

11911

add a comment |

1 Answer
1

active

oldest

votes

You have found an old article which was written for an ancient WebView of macOS, not for WKWebView.

You use WKScriptMessageHandler to make interaction between JavaScript and Swift, when using WKWebView.

ViewController.swift:

import WebKit



class ViewController: NSViewController, WKUIDelegate {

    @IBOutlet weak var wkWebView: WKWebView!

    override func viewDidLoad() {

        super.viewDidLoad()

        let url = Bundle.main.url(forResource: "index", withExtension: "html")! //Simplified for testing

        let request = URLRequest(url: url)

        wkWebView.configuration.preferences.javaScriptEnabled = true

        wkWebView.configuration.userContentController.add(self, name: "mySwiftMessage") //<-

        wkWebView.load(request)

    }



    //...

}



extension ViewController: WKScriptMessageHandler {

    func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {

        switch message.name {

        case "mySwiftMessage":

            if let callbackName = message.body as? String {

                message.webView?.evaluateJavaScript("(callbackName)('Hello From Swift');", completionHandler: nil)

            }

        default:

            break

        }

    }

}

index.html:

<html>

    <body>

        <script>

            function myCallback(value) {

                document.getElementById("i").value = value;

            }

        </script>

        <p>Hello World</p>

        <input type=text id='i'/>

        <input type=button value='Submit' onclick='window.webkit.messageHandlers.mySwiftMessage.postMessage("myCallback");'>

    </body>

</html>

ADDITION

To make WKWebView work on prior iOS's than 11, you just need to instantiate it programmatically:

import WebKit



class ViewController: UIViewController, WKUIDelegate {



    var wkWebView: WKWebView! //<- NOT an IBOutlet



    override func viewDidLoad() {

        super.viewDidLoad()

        let webConfig = WKWebViewConfiguration()

        webConfig.preferences.javaScriptEnabled = true

        webConfig.userContentController.add(self, name: "mySwiftMessage")

        wkWebView = WKWebView(frame: self.view.bounds, configuration: webConfig)

        view.addSubview(wkWebView)

        //You may need to add some constraints...

        //And create a better `index.html` for iOS...

        let url = Bundle.main.url(forResource: "index", withExtension: "html")!

        let request = URLRequest(url: url)

        wkWebView.load(request)

    }



    //...

}

edited Jan 19 at 10:09

answered Jan 19 at 8:12

OOPer

34.4k46385

Thank you for the completely working solution.. I would also like to make it work for UIWebView to support iOS 9.0+ since WKWebView is only for iOS11+. Is it possible?

– arun siara.cc
Jan 19 at 8:34

I could not find such an elegant solution for UIWebView. Seems only workarounds are available (such as loading a custom url)

– arun siara.cc
Jan 19 at 8:40

1

You are mistaking the availability of WKWebView, which is available since iOS 8. Just that you cannot use storyboard for WKWebView before iOS 11. You just need to instantiate your WKWebView programmatically.

– OOPer
Jan 19 at 10:12

Excellent.. That worked too.. I wish I can upvote you more than once.. Thanks a ton!!

– arun siara.cc
Jan 19 at 10:23

add a comment |

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1 Answer
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1 Answer
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You have found an old article which was written for an ancient WebView of macOS, not for WKWebView.

You use WKScriptMessageHandler to make interaction between JavaScript and Swift, when using WKWebView.

ViewController.swift:

import WebKit



class ViewController: NSViewController, WKUIDelegate {

    @IBOutlet weak var wkWebView: WKWebView!

    override func viewDidLoad() {

        super.viewDidLoad()

        let url = Bundle.main.url(forResource: "index", withExtension: "html")! //Simplified for testing

        let request = URLRequest(url: url)

        wkWebView.configuration.preferences.javaScriptEnabled = true

        wkWebView.configuration.userContentController.add(self, name: "mySwiftMessage") //<-

        wkWebView.load(request)

    }



    //...

}



extension ViewController: WKScriptMessageHandler {

    func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {

        switch message.name {

        case "mySwiftMessage":

            if let callbackName = message.body as? String {

                message.webView?.evaluateJavaScript("(callbackName)('Hello From Swift');", completionHandler: nil)

            }

        default:

            break

        }

    }

}

index.html:

<html>

    <body>

        <script>

            function myCallback(value) {

                document.getElementById("i").value = value;

            }

        </script>

        <p>Hello World</p>

        <input type=text id='i'/>

        <input type=button value='Submit' onclick='window.webkit.messageHandlers.mySwiftMessage.postMessage("myCallback");'>

    </body>

</html>

ADDITION

To make WKWebView work on prior iOS's than 11, you just need to instantiate it programmatically:

import WebKit



class ViewController: UIViewController, WKUIDelegate {



    var wkWebView: WKWebView! //<- NOT an IBOutlet



    override func viewDidLoad() {

        super.viewDidLoad()

        let webConfig = WKWebViewConfiguration()

        webConfig.preferences.javaScriptEnabled = true

        webConfig.userContentController.add(self, name: "mySwiftMessage")

        wkWebView = WKWebView(frame: self.view.bounds, configuration: webConfig)

        view.addSubview(wkWebView)

        //You may need to add some constraints...

        //And create a better `index.html` for iOS...

        let url = Bundle.main.url(forResource: "index", withExtension: "html")!

        let request = URLRequest(url: url)

        wkWebView.load(request)

    }



    //...

}

edited Jan 19 at 10:09

answered Jan 19 at 8:12

OOPer

34.4k46385

Thank you for the completely working solution.. I would also like to make it work for UIWebView to support iOS 9.0+ since WKWebView is only for iOS11+. Is it possible?

– arun siara.cc
Jan 19 at 8:34

I could not find such an elegant solution for UIWebView. Seems only workarounds are available (such as loading a custom url)

– arun siara.cc
Jan 19 at 8:40

1

You are mistaking the availability of WKWebView, which is available since iOS 8. Just that you cannot use storyboard for WKWebView before iOS 11. You just need to instantiate your WKWebView programmatically.

– OOPer
Jan 19 at 10:12

Excellent.. That worked too.. I wish I can upvote you more than once.. Thanks a ton!!

– arun siara.cc
Jan 19 at 10:23

add a comment |

You have found an old article which was written for an ancient WebView of macOS, not for WKWebView.

You use WKScriptMessageHandler to make interaction between JavaScript and Swift, when using WKWebView.

ViewController.swift:

import WebKit



class ViewController: NSViewController, WKUIDelegate {

    @IBOutlet weak var wkWebView: WKWebView!

    override func viewDidLoad() {

        super.viewDidLoad()

        let url = Bundle.main.url(forResource: "index", withExtension: "html")! //Simplified for testing

        let request = URLRequest(url: url)

        wkWebView.configuration.preferences.javaScriptEnabled = true

        wkWebView.configuration.userContentController.add(self, name: "mySwiftMessage") //<-

        wkWebView.load(request)

    }



    //...

}



extension ViewController: WKScriptMessageHandler {

    func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {

        switch message.name {

        case "mySwiftMessage":

            if let callbackName = message.body as? String {

                message.webView?.evaluateJavaScript("(callbackName)('Hello From Swift');", completionHandler: nil)

            }

        default:

            break

        }

    }

}

index.html:

<html>

    <body>

        <script>

            function myCallback(value) {

                document.getElementById("i").value = value;

            }

        </script>

        <p>Hello World</p>

        <input type=text id='i'/>

        <input type=button value='Submit' onclick='window.webkit.messageHandlers.mySwiftMessage.postMessage("myCallback");'>

    </body>

</html>

ADDITION

To make WKWebView work on prior iOS's than 11, you just need to instantiate it programmatically:

import WebKit



class ViewController: UIViewController, WKUIDelegate {



    var wkWebView: WKWebView! //<- NOT an IBOutlet



    override func viewDidLoad() {

        super.viewDidLoad()

        let webConfig = WKWebViewConfiguration()

        webConfig.preferences.javaScriptEnabled = true

        webConfig.userContentController.add(self, name: "mySwiftMessage")

        wkWebView = WKWebView(frame: self.view.bounds, configuration: webConfig)

        view.addSubview(wkWebView)

        //You may need to add some constraints...

        //And create a better `index.html` for iOS...

        let url = Bundle.main.url(forResource: "index", withExtension: "html")!

        let request = URLRequest(url: url)

        wkWebView.load(request)

    }



    //...

}

edited Jan 19 at 10:09

answered Jan 19 at 8:12

OOPer

34.4k46385

Thank you for the completely working solution.. I would also like to make it work for UIWebView to support iOS 9.0+ since WKWebView is only for iOS11+. Is it possible?

– arun siara.cc
Jan 19 at 8:34

I could not find such an elegant solution for UIWebView. Seems only workarounds are available (such as loading a custom url)

– arun siara.cc
Jan 19 at 8:40

1

You are mistaking the availability of WKWebView, which is available since iOS 8. Just that you cannot use storyboard for WKWebView before iOS 11. You just need to instantiate your WKWebView programmatically.

– OOPer
Jan 19 at 10:12

Excellent.. That worked too.. I wish I can upvote you more than once.. Thanks a ton!!

– arun siara.cc
Jan 19 at 10:23

add a comment |

You have found an old article which was written for an ancient WebView of macOS, not for WKWebView.

You use WKScriptMessageHandler to make interaction between JavaScript and Swift, when using WKWebView.

ViewController.swift:

import WebKit



class ViewController: NSViewController, WKUIDelegate {

    @IBOutlet weak var wkWebView: WKWebView!

    override func viewDidLoad() {

        super.viewDidLoad()

        let url = Bundle.main.url(forResource: "index", withExtension: "html")! //Simplified for testing

        let request = URLRequest(url: url)

        wkWebView.configuration.preferences.javaScriptEnabled = true

        wkWebView.configuration.userContentController.add(self, name: "mySwiftMessage") //<-

        wkWebView.load(request)

    }



    //...

}



extension ViewController: WKScriptMessageHandler {

    func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {

        switch message.name {

        case "mySwiftMessage":

            if let callbackName = message.body as? String {

                message.webView?.evaluateJavaScript("(callbackName)('Hello From Swift');", completionHandler: nil)

            }

        default:

            break

        }

    }

}

index.html:

<html>

    <body>

        <script>

            function myCallback(value) {

                document.getElementById("i").value = value;

            }

        </script>

        <p>Hello World</p>

        <input type=text id='i'/>

        <input type=button value='Submit' onclick='window.webkit.messageHandlers.mySwiftMessage.postMessage("myCallback");'>

    </body>

</html>

ADDITION

To make WKWebView work on prior iOS's than 11, you just need to instantiate it programmatically:

import WebKit



class ViewController: UIViewController, WKUIDelegate {



    var wkWebView: WKWebView! //<- NOT an IBOutlet



    override func viewDidLoad() {

        super.viewDidLoad()

        let webConfig = WKWebViewConfiguration()

        webConfig.preferences.javaScriptEnabled = true

        webConfig.userContentController.add(self, name: "mySwiftMessage")

        wkWebView = WKWebView(frame: self.view.bounds, configuration: webConfig)

        view.addSubview(wkWebView)

        //You may need to add some constraints...

        //And create a better `index.html` for iOS...

        let url = Bundle.main.url(forResource: "index", withExtension: "html")!

        let request = URLRequest(url: url)

        wkWebView.load(request)

    }



    //...

}

edited Jan 19 at 10:09

answered Jan 19 at 8:12

OOPer

34.4k46385

You have found an old article which was written for an ancient WebView of macOS, not for WKWebView.

You use WKScriptMessageHandler to make interaction between JavaScript and Swift, when using WKWebView.

ViewController.swift:

import WebKit



class ViewController: NSViewController, WKUIDelegate {

    @IBOutlet weak var wkWebView: WKWebView!

    override func viewDidLoad() {

        super.viewDidLoad()

        let url = Bundle.main.url(forResource: "index", withExtension: "html")! //Simplified for testing

        let request = URLRequest(url: url)

        wkWebView.configuration.preferences.javaScriptEnabled = true

        wkWebView.configuration.userContentController.add(self, name: "mySwiftMessage") //<-

        wkWebView.load(request)

    }



    //...

}



extension ViewController: WKScriptMessageHandler {

    func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {

        switch message.name {

        case "mySwiftMessage":

            if let callbackName = message.body as? String {

                message.webView?.evaluateJavaScript("(callbackName)('Hello From Swift');", completionHandler: nil)

            }

        default:

            break

        }

    }

}

index.html:

<html>

    <body>

        <script>

            function myCallback(value) {

                document.getElementById("i").value = value;

            }

        </script>

        <p>Hello World</p>

        <input type=text id='i'/>

        <input type=button value='Submit' onclick='window.webkit.messageHandlers.mySwiftMessage.postMessage("myCallback");'>

    </body>

</html>

ADDITION

To make WKWebView work on prior iOS's than 11, you just need to instantiate it programmatically:

import WebKit



class ViewController: UIViewController, WKUIDelegate {



    var wkWebView: WKWebView! //<- NOT an IBOutlet



    override func viewDidLoad() {

        super.viewDidLoad()

        let webConfig = WKWebViewConfiguration()

        webConfig.preferences.javaScriptEnabled = true

        webConfig.userContentController.add(self, name: "mySwiftMessage")

        wkWebView = WKWebView(frame: self.view.bounds, configuration: webConfig)

        view.addSubview(wkWebView)

        //You may need to add some constraints...

        //And create a better `index.html` for iOS...

        let url = Bundle.main.url(forResource: "index", withExtension: "html")!

        let request = URLRequest(url: url)

        wkWebView.load(request)

    }



    //...

}

edited Jan 19 at 10:09

answered Jan 19 at 8:12

OOPer

34.4k46385

edited Jan 19 at 10:09

answered Jan 19 at 8:12

OOPer

34.4k46385

answered Jan 19 at 8:12

OOPer

34.4k46385

answered Jan 19 at 8:12

OOPer

34.4k46385

Thank you for the completely working solution.. I would also like to make it work for UIWebView to support iOS 9.0+ since WKWebView is only for iOS11+. Is it possible?

– arun siara.cc
Jan 19 at 8:34

I could not find such an elegant solution for UIWebView. Seems only workarounds are available (such as loading a custom url)

– arun siara.cc
Jan 19 at 8:40

1

You are mistaking the availability of WKWebView, which is available since iOS 8. Just that you cannot use storyboard for WKWebView before iOS 11. You just need to instantiate your WKWebView programmatically.

– OOPer
Jan 19 at 10:12

Excellent.. That worked too.. I wish I can upvote you more than once.. Thanks a ton!!

– arun siara.cc
Jan 19 at 10:23

add a comment |

Thank you for the completely working solution.. I would also like to make it work for UIWebView to support iOS 9.0+ since WKWebView is only for iOS11+. Is it possible?

– arun siara.cc
Jan 19 at 8:34

I could not find such an elegant solution for UIWebView. Seems only workarounds are available (such as loading a custom url)

– arun siara.cc
Jan 19 at 8:40

1

You are mistaking the availability of WKWebView, which is available since iOS 8. Just that you cannot use storyboard for WKWebView before iOS 11. You just need to instantiate your WKWebView programmatically.

– OOPer
Jan 19 at 10:12

Excellent.. That worked too.. I wish I can upvote you more than once.. Thanks a ton!!

– arun siara.cc
Jan 19 at 10:23

Thank you for the completely working solution.. I would also like to make it work for UIWebView to support iOS 9.0+ since WKWebView is only for iOS11+. Is it possible?

– arun siara.cc
Jan 19 at 8:34

I could not find such an elegant solution for UIWebView. Seems only workarounds are available (such as loading a custom url)

– arun siara.cc
Jan 19 at 8:40

You are mistaking the availability of WKWebView, which is available since iOS 8. Just that you cannot use storyboard for WKWebView before iOS 11. You just need to instantiate your WKWebView programmatically.

– OOPer
Jan 19 at 10:12

Excellent.. That worked too.. I wish I can upvote you more than once.. Thanks a ton!!

– arun siara.cc
Jan 19 at 10:23

add a comment |

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