xamarin forms with_ Custom renderer_
check the image for the checkbox same
Do you really need to use a CustomRenderer (IE: Is there some business rule for your app that requires it?) ? If you place the native Checkbox it will always have the right look for the current OS theme.
Personally I'd just stick a native Checkbox on the Form and be done with it; assume you don't have some other requirement that stops that from being an option.
Why you need custom renderer?
Use the ASNum plug-in - XFControls (Please forgive documentation sucks - all Chinese or something, which at least I do not understand)
Works great on both iOS and Android (also have other cool controls, just check the root dir on GitHub).
Hope this helps.
-- N Baua
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