Detect if page is loaded inside WKWebView in JavaScript

Question

How can I reliably detect using javascript that a page is loaded inside a WKWebView? I\'d like to be able to detect these scenarios:

• iOS & WKWebView
<

Answer 1

In iOS, you could add this code to establish communication between javascript and objective-c:

WKWebViewConfiguration *configuration = [[WKWebViewConfiguration alloc] init];
WKUserContentController *controller = [[WKUserContentController alloc] init];
[controller addScriptMessageHandler:self name:@"javascript_observer"];
configuration.userContentController = controller;

...

webview = [[WKWebView alloc] initWithFrame:... configuration: configuration];

In javascript, you could test the connection like this:

if ( window.webkit != undefined ){
//javascript is running in webview
}