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.
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.
Master iOS 11 now!
My book Practical iOS 11 gives you seven complete coding projects that teach all the major new features in iOS 11 in a smart, practical way.