Swift version: 5.1
Swift 2.2 introduced a lot of major language changes. You can read my full article explaining the changes with code examples by clicking here, but here are the highlights:
LEARN SWIFTUI FOR FREE I have a massive, free SwiftUI video collection on YouTube teaching you how to build complete apps with SwiftUI – check it out!
Available from iOS 7.0
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.