Black transparent modal alert on iOS, as seen in several apps - ios

I'm looking for an API for a certain type of modal alert view (iOS), but I'm not entirely sure whether it's home-built or Apple-provided. It looks like a black transparent square, with rounded corners, usually one icon and a label below. For instance, it is used in the iPhone Twitter app. As observed, it only displays information momentarily and is dismissed when a state has changed (like "Loading" or "Posting").
Is there a pre-built API for this or is it custom built? And if possible, when shared publicly, where can I find such a thing?
Any help is greatly appreciated.
Kind regards,
Reinder

MBProgressHUD is what you're looking for:
https://github.com/matej/MBProgressHUD
Apple does not reject applications using MBProgressHUD.

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