According to your code, the parameter result should contain the property url. We suppose that the url contains the JSON data you want to pass.
Try the following 2 approaches:
// Approach 1:
func callJS() {
let json = "{ url:\"An url with json?\"}"
let scriptString = "let result=\(json); appQrHandlerSet(result);"
webView?.evaluateJavaScript(scriptString, completionHandler: { (object, error) in
})
}
// Approach 2:
func initWebViewWithJs() {
let config = WKWebViewConfiguration()
config.userContentController = WKUserContentController()
let json = "{ url:\"An url with json?\"}"
let scriptString = "let result=\(json); appQrHandlerSet(result);"
let script = WKUserScript(source: scriptString, injectionTime: WKUserScriptInjectionTime.atDocumentEnd, forMainFrameOnly: true)
config.userContentController.addUserScript(script)
webView = WKWebView(frame: CGRect(x: 0, y: 0, width: 320, height: 400), configuration: config)
}