Swift has two anonymous types:
AnyObject. They are subtly different, and you will need to use both sooner or later.
AnyObject refers to any instance of a class, and is equivalent to
id in Objective-C. It’s useful when you specifically want to work with a reference type, because it won’t allow any of Swift’s structs or enums to be used.
AnyObject is also used when you want to restrict a protocol so that it can be used only with classes.
Any refers to any instance of a class, struct, or enum – literally anything at all. You’ll see this in Swift wherever types are unknown or are mixed in ways that can be meaningfully categorized:
let values: [Any] = [1, 2, "Fish"]
Ideally you should avoid both
AnyObject in your code – it’s better to be more specific if you can be.
Sponsored You’re already busy updating your app for Swift 4.2 and iOS 12, so why not let Instabug help you find and fix bugs? Add just two lines of code to your project and receive comprehensive reports with all the feedback you need to ship a world-class app – click here to learn more!
Available from iOS 8.0 – learn more in my book Swift Design Patterns
Did this solution work for you? Please pass it on!
Other people are reading…
About the Swift Knowledge Base
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.
Learn Server-Side Swift now!
Take your Swift code to the server and become a full-stack developer with my latest book: Server-Side Swift!