Issue Description

We experience a null pointer exception in our app, and it seems to be related to Switch and background color.
It looks suspiciously similar to this NativeScript/nativescript-angular#2134 and #9922, but for iOS.

Reproduction

I'm unable to reliably reproduce this.

Relevant log output (if applicable)

TypeError: Cannot set property 'onTintColor' of null
at Switch.setNativeBackgroundColor
at Switch._onCheckedPropertyChanged
at onCheckedPropertyChanged
at Switch.checked
at ViewUtil.setPropertyInternal
at ViewUtil.setProperty
at EmulatedRenderer.setProperty
at ZoneDelegate.invoke
at Zone.run

Environment

No response

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• I have searched the existing issues as well as StackOverflow and this has not been posted before
• This is a bug report
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