Both class and structure can do:
- Define properties to store values
- Define methods to provide functionality
- Be extended
- Conform to protocols
- Define intialisers
- Define Subscripts to provide access to their variables
Only class can do:
- Inheritance
- Type casting
- Define deinitialisers
- Allow reference counting for multiple references.
Major differences between Structures and Classes:
- Structures cannot Inherit from other types.
- Classes use type-casting to treat a class as a superclass or subclass, as well as check protocol adoption. Structs can only use the protocol adoption part.
- Structures do not have deinitializers.
- Structures cannot have multiple references to the same instance
https://stackoverflow.com/questions/24217586/structure-vs-class-in-swift-language