You just drag the font file (.ttf) into the resources area on the left pane of Xcode.
When you drop it in, a dialog box will appear. Make sure the target for your application checkbox is checked. Then add the following key to your plist:
Fonts provided by application
With the values of the filename "myFont.ttf"
UPDATE (see comment below)
Also make sure the font is added to the Copy Bundle Resources (found under Target -> Build Phases) I just spent about an hour on this, and I was the one who answered this question months ago lol.
UPDATE
Another helpful tip to find the name of the font for the font-family if you are using CSS is to run the following command:
NSLog("Available fonts: %@", UIFont.familyNames());
It prints out all the font name available to the system, including the ones you custom added.
