DeviceMotion and DeviceOrientation in WKWebView iOS 13

Question

DeviceMotion and DeviceOrientation in WKWebView iOS 13

2.7k Views Asked by Nikunj Acharya At 21 November 2019 at 08:00

I want to use DeviceMotion and DeviceOrientation events in WKWebView in iOS 13+. I am using below code

<html>
    <style>
        #container{
            margin: 20px; 
            padding: 20px
        }
        #deviceType{
            text-align: center; 
            font-family: Arial, Helvetica, sans-serif; 
            font-size: 3rem;
            font-weight: bold; 
            color: #08f
        }
        #permission{
            padding: 2rem 5rem;
            background: #08f;
            color: white; 
            margin-top: 30;
            font-family: Arial, Helvetica, sans-serif; 
            font-size: 3rem;
            border: none; 
            border-radius: 1rem
        }
        #permissionStatus{
            text-align: center; 
            font-family: Arial, Helvetica, sans-serif; 
            font-size: 2.5rem;
            font-weight: 600; 
            color: red;
            margin-top: 30px
        }
    </style>
    <body>
        <div id="container">
                <div id="deviceType"></div>
                <div style="text-align: center">
                    <button id="permission">Ask for permission</button>
                </div>
                <div id="permissionStatus">Pending</div>
        </div>
    </body>
    <script>

        if (typeof DeviceMotionEvent.requestPermission === 'function') {
            document.getElementById('deviceType').innerText = 'iOS 13'
            document.getElementById('permission').addEventListener('click', function () {
                console.log('button clicked')
                DeviceMotionEvent.requestPermission().then(response => {

                    // This is showing "denied" without showing any permission popup
                    console.log(response)
                    document.getElementById('permissionStatus').innerText = response

                }).catch(console.error)
            });
        } else {
            // ignore this case for processing
            console.log('non iOS 13')
            document.getElementById('deviceType').innerText = 'non iOS 13'
        }
    </script>
</html>

This webpage is working both in safari and chrome and asking permission to use device motion as shown below

Images:

Status will be updated based on I click Allow or Cancel

But in my app inside I am using WKWebView and When I press Ask Permission Button, It is not showing any alert for asking permission and it is directly setting status to Denied. (shown below).

Please guide me if I am doing something wrong or any extra stuffs required from WKWebView side. Here is my iOS WKWebView Code. I don't know if changes in WKUserContentController or WKWebViewConfiguration are required.

self.webView = WKWebView(frame: .zero)
self.webView.translatesAutoresizingMaskIntoConstraints = false

// Add the webview as a subview of MTKView
self.view.addSubview(self.webView)

self.webView.leadingAnchor.constraint(equalTo: self.view.leadingAnchor).isActive = true
self.webView.topAnchor.constraint(equalTo: self.view.topAnchor).isActive = true
self.webView.trailingAnchor.constraint(equalTo: self.view.trailingAnchor).isActive = true
self.webView.bottomAnchor.constraint(equalTo: self.view.bottomAnchor).isActive = true


let websiteDataTypes = NSSet(array: [WKWebsiteDataTypeDiskCache, WKWebsiteDataTypeMemoryCache])
let date = Date(timeIntervalSince1970: 0)
WKWebsiteDataStore.default().removeData(ofTypes: websiteDataTypes as! Set<String>, modifiedSince: date, completionHandler:{ })

self?.webView.load(URLRequest(url: URL(string: url)!))

Original Q&A

There are 2 best solutions below

TouchBoarder On 24 February 2020 at 08:55

On Xamarin iOS (Xamarin.Forms) you can inject the permission request script with the EvaluateJavaScript method on the WkWebView when it is ready:

webView.EvaluateJavaScript("DeviceMotionEvent.requestPermission().then(response => { if (response == 'granted') {window.addEventListener('devicemotion', (e) => {})}}).catch(console.error)");

If using a custom WkWebView renderer the script can be injected when setting the webView control in OnElementChanged (must implement IWKUIDelegate if this bug is still around https://bugs.webkit.org/show_bug.cgi?id=203287)

Example:

// do this when setting up the webview control in OnElementChanged
                //enable device motion sensors permission script:
                //https://medium.com/flawless-app-stories/how-to-request-device-motion-and-orientation-permission-in-ios-13-74fc9d6cd140
                var source =
                "function requestSensorPermission() {" +
                "   if (typeof(DeviceMotionEvent) !== 'undefined' && typeof(DeviceMotionEvent.requestPermission) === 'function') {" +
                "       DeviceMotionEvent.requestPermission() .then(response => {" +
                "           if (response == 'granted') { " +
                "               window.addEventListener('devicemotion', (e) => { })" +
                "           }" +
                "       }).catch(console.error)" +
                "   }" +
                "}";
                var script = new WKUserScript(new NSString(source), WKUserScriptInjectionTime.AtDocumentEnd, true);
                wkWebView.Configuration.UserContentController.AddUserScript(script);

Then you can call yourCustomWebView.EvaluateJavaScript("requestSensorPermission()") in your code behind when WkWebView is ready.

EvaluateJavaScript: https://learn.microsoft.com/en-us/dotnet/api/webkit.wkwebview.evaluatejavascript?view=xamarin-ios-sdk-12

Custom WkWebView Renderer: https://learn.microsoft.com/en-us/xamarin/xamarin-forms/app-fundamentals/custom-renderer/hybridwebview#create-the-custom-renderer-on-ios

**Nikunj Acharya** · Accepted Answer · 2019-12-09T09:05:42.423000

Nikunj Acharya On 09 December 2019 at 09:05 BEST ANSWER

I tried using uiDelegate and it worked

Just added one line inside viewDidLoad

webView.uiDelegate = self

Also you will have to confirm type of ViewController to WKUIDelegate. That's it

DeviceMotion and DeviceOrientation in WKWebView iOS 13

There are 2 best solutions below

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