Class

• Reference type.
• Stored on the heap.
• Can be inherited.
• It is a blueprint.
• An object is an instance of a class.
• Type casting done at runtime.
• Includes a deinit - Clean up resources in class lifecycle.
• Can be more than one reference to a class.
• No memberwise initializer.
• Use when we need Objective-C interoperability.
• Use when you need to control identity of data.
• Class inheritance only with other classes.

Example:

class UserAccountViewController: UIViewController {
  ...
}

Related articles:

• Struct
• Struct vs Class

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