Class-Only Protocols in Swift

Question

I want some of my classes (not all) to conform using \'Class-Only Protocols\' from docs. What I am doing is

protocol RefreshData: class, ClassA, ClassB
{
    fun         


        

Answer 1

The answers provided by Chris and Wain are correct. I'm just adding a few more details here.

Defining a protocol

You must distinguish the concept of declaring a protocol (available for classes)

protocol RefreshData: class {
    func updateController()
}

Defining a class

...from the concept of conforming your class to a protocol

class ClassA: RefreshData {
    func updateController() {

    }
}

Conforming a class you don't own

Sometimes you want to conform a class to a protocol but you don't own the source code for that class. In this case you can use an extension

extension ClassB: RefreshData {
    func updateController() {

    }
}