Most examples of using UIActivityViewController show how to exclude activity types but they don't show how to only specify wanted types.
For example,
I only want email and messages to be the displayed activities. The init method of UIActivityViewController has a parameter called applicationActivities which is an array of UIActivity.
This implies to me that passing an array of UIActivity rather than nil would be setting a whitelist. It seems that populating this array would achieve what I want. Is my assumption correct? If so, what are the classes for email and messages.
Question:
How do I instantiate instances of them? Or more generally, how do I figure out the class of any of the standard activity types and instantiate them?