Start Developing iOS Apps (Swift): a tutorial from Apple documentation archives. This tutorial may still be found at https://developer.apple.com/library/archive/referencelibrary/GettingStarted/DevelopiOSAppsSwift/
The FooTracker tutorial involves developing a few views and getting to know introductry concepts in iOS development such as MVC design pattern, working with view controllers, implementing custom controls, defining data models, and more.