AnyObject v.s. Any in Swift

AnyObject

AnyObject can represent an instance of any class type.

1)
AnyObject can be used as the concrete type for an instance of any class, class type, or class-only protocol.
Example:

class TestB {}
var tmp1: AnyObject = TestB()
var tmp2: AnyObject = TestB.self

2)
AnyObject can also be used as the concrete type for an instance of a type that bridges to an Objective-C class. Many value types in Swift bridge to Objective-C counterparts, like String and Int.
Example:

var tmp: AnyObject = "This is a string" as NSString

Any

Any can represent an instance of any type at all, including function types, optional types.
Example:

var closure: () -> Void = {}
var tmp: Any = closure()

Ref:

https://medium.com/@mimicatcodes/any-vs-anyobject-in-swift-3-b1a8d3a02e00
https://developer.apple.com/documentation/swift/anyobject
https://docs.swift.org/swift-book/LanguageGuide/TypeCasting.html