My approach to this was to make a static view that had a PNG with
transparency to make the screen a little dimmer, another view added to this
with its alpha set to about 0.8f with rounded corners, and a
UIActivityIndicator added to this. When ShowView() is called it adds itself
to the base UIWindow of the application.
This means I can easily show a loading view with a consistent style from
anywhere in my app. (Just remember to use InvokeOnMainThread(delegate{..});
when showing and hiding it if from a different thread.
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