To access all the family names that are available on the current iOS you’re developing for, you can call the following class function:
A family name is essentially the top-level name for a font. That is, not including the sub-type names like bold, italic, etc… Here are some examples:
Avenir Next
or,
Courier New
And not the specific font names, such as:
AvenirNext-Regular
or,
CourierNewPSMT