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

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