Send messages from JavaScript and Handle them on the native side
suggest changeMessages can be sent from JavaScript using the following code
window.webkit.messageHandlers.{NAME}.postMessage()
Here how to create a script message handler to handle the messages:
class NotificationScriptMessageHandler: NSObject, WKScriptMessageHandler {
func userContentController(userContentController: WKUserContentController, didReceiveScriptMessage message: WKScriptMessage!) {
if message.name == "{NAME}" {
// to be sure of handling the correct message
print(message.body)
}
}
}
Here how to configure the script message handler in the WKWebView:
let configuration = WKWebViewConfiguration()
let userContentController = WKUserContentController()
let handler = NotificationScriptMessageHandler()
userContentController.addScriptMessageHandler(handler, name: "{NAME}")
configuration.userContentController = userContentController
let webView = WKWebView(frame: self.view.bounds, configuration: configuration)
NOTE: adding same "{NAME}" handler with addScriptMessageHandler:name: more than once, results in NSInvalidArgumentExceptionexception.
Found a mistake? Have a question or improvement idea?
Let me know.
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