(swiftUI, custom font, add font to Xcode)

Use this list to view built in fonts for Apple’s platforms:
https://developer.apple.com/fonts/system-fonts/

If a font has a gear icon next to it, it’s available out-of-the-box on iOS/MacOS [1]
If a font has a download icon, I need to add it manually to my Xcode project:

• Open the MacOS program “Font Book”
  
• Search for the font that I want
  
• Right click on the font and tap ‘Show in Finder’
  
• Drag the ttc file into Xcode, use the ‘copy item’ option
  
• Open the Xcode inspect panel with cmd+opt+0
  
• Add the font to my target in ‘target membership’
  
• Tap on the project root in the Xcode project tree
  
• Tap on the ‘info’ tab
  
• Add ‘Fonts provided by application’
  • As ‘item 0’, add the filename of the ttf file that was dragged into Xcode
    
• The custom font will now work in SwiftUI preview

See this thread for screenshots of the process.

Note 1:

Finding the string to pass to the first argument of Font.custom(...) requires looking up the built-in postscript font name. From the Apple docs:

“You can find the postscript name of a font by opening it with the Font Book app and selecting the Font Info tab”

Source: https://developer.apple.com/documentation/swiftui/applying-custom-fonts-to-text