QR-Scanner Shows Preview In Android but Not in IOS

I am using Ionic Native plugin QR SCANNER but the app in IOS is not showing a preview. Did some research but couldn’t find a solution. I have set background-color :transparent !important to almost Everything including:

html, body, ion-app, ion-content, ion-page, .nav-decor, content-md, content-ios,ion-app.ios,.fixed-content,.scroll-content{
background-color: transparent !important;
But still the app in IOS displays a white screen Instead of a Preview And the QR scanner is working in the background just not showing the preview. But everything works fine on Android.