WhiteHouse petitions is an iOS app that shows White House petitions by fetching JSON file https://www.hackingwithswift.com/samples/petitions-1.json . Data has been taken from the White House API in Paul Hudson's 100 Days of Swift course.
What I have mastered:
⦿ Using Codable protocol
⦿ Fetching data
⦿ Parsing JSON feed
⦿ UITabBarController
⦿ UIStoryboard