Using UIWebView with iOS
While UIWebView has been deprecated by Apple and should not be used anymore, there are circumstances where an update to an existing app needs to be done.
Apple will not allow this to be done for long, so this method will not work forever.
Two lines need to be in your config.xml file:
<plugin name="cordova-plugin-uiwebview-engine" source="npm" /> <engine name="ios" spec="5.1.1" />
The first line tells VoltBuilder to load UiWebView. (You may have this line already)
The second tells VoltBuilder to use the old build engine, instead of the default.
You will want to remove these two lines as soon as possible.