What is Swift ?
Swift is a powerful and intuitive programming language for macOS, iOS, watchOS, tvOS and beyond. Writing Swift code is interactive and fun, the syntax is concise yet expressive, and Swift includes modern features developers love. Swift code is safe by design, yet also produces software that runs lightning-fast.

this application give you a very simple introduction to start with Swift By viewing the following themes:
1) Swift tutorial
2) Control Statements
3) Functions
4) Arrays
5) Object Constructors
7) Variables
8) classes