Sync a Shared Google Calendar with Calendar in iOS or macOS

I spent a long time trying to get a shared Google Calendar to show up in the Calendar in iOS or macOS and finally ran across this link containing the settings of which calendars are shared:

https://www.google.com/calendar/syncselect

You must go directly to this link as there doesn't appear to be any way of getting there otherwise, and you must check or uncheck the calendars to share and then save the settings. Good luck!