title: White blank screen issue with cordova ios with cordova-plugin-ionic-webview or cordova-plugin-wkwebview-engine plugins
body: <p>There will an issue with UIWebview in ios. Apple is going to reject app using this. So we decided to use WKWebview for our cordova ios app. I installed cordova-plugin-wkwebview-engine and added <code>&lt;preference name="WKWebViewOnly" value="true" /&gt;</code> in config.xml file. 
  The issue is after the splash screen Its showing white blank screen. </p>
  
  <pre><code>    &lt;?xml version='1.0' encoding='utf-8'?&gt;
  &lt;widget id="io.cordova.hellocordova" version="1.0.0" xmlns="http://www.w3.org/ns/widgets" xmlns:cdv="http://cordova.apache.org/ns/1.0"&gt;
      &lt;name&gt;HelloCordova&lt;/name&gt;
      &lt;description&gt;
          A sample Apache Cordova application that responds to the deviceready event.
      &lt;/description&gt;
      &lt;author email="dev@cordova.apache.org" href="http://cordova.io"&gt;
          Apache Cordova Team
      &lt;/author&gt;
      &lt;content src="index.html" /&gt;
      &lt;plugin name="cordova-plugin-whitelist" spec="1" /&gt;
      &lt;access origin="*" /&gt;
      &lt;allow-intent href="http://*/*" /&gt;
      &lt;allow-intent href="https://*/*" /&gt;
      &lt;allow-intent href="tel:*" /&gt;
      &lt;allow-intent href="sms:*" /&gt;
      &lt;allow-intent href="mailto:*" /&gt;
      &lt;allow-intent href="geo:*" /&gt;
      &lt;platform name="android"&gt;
          &lt;allow-intent href="market:*" /&gt;
      &lt;/platform&gt;
      &lt;platform name="ios"&gt;
          &lt;allow-intent href="itms:*" /&gt;
          &lt;allow-intent href="itms-apps:*" /&gt;
      &lt;/platform&gt;
      &lt;plugin name="cordova-plugin-ionic-webview" spec="^4.1.3" /&gt;
      &lt;preference name="WKWebViewOnly" value="true" /&gt;
      &lt;engine name="ios" spec="~5.1.1" /&gt;
      &lt;plugin name="cordova-plugin-background-mode" spec="^0.7.3" /&gt;
      &lt;plugin name="cordova-plugin-badge" spec="^0.8.8" /&gt;
      &lt;plugin name="cordova-plugin-camera" spec="^4.1.0" /&gt;
      &lt;plugin name="cordova-plugin-device" spec="^2.0.3" /&gt;
      &lt;plugin name="cordova-plugin-geolocation" spec="^4.0.2" /&gt;
      &lt;plugin name="cordova-plugin-splashscreen" spec="^5.0.3" /&gt;
      &lt;plugin name="cordova-plugin-x-toast" spec="^2.7.2" /&gt;
  &lt;/widget&gt;
  
  </code></pre>