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

Latest version of Swift can do it! I would do a protocol and protocol extensions that target the classes you want! (constraint the extension to specific class)

    protocol Movable {
        func moveForward()
        func moveBackward()
    }

    extension Movable where Self: Car {
        func moveForward() {
            self.location.x += 10;
        }

        func moveBackward() {
            self.location.x -= 10;
        }
    }
    extension Movable where Self: Bike {
        func moveForward() {
            self.x += 1;
        }

        func moveBackward() {
            self.x -= 1;
        }
    }

    class Car: Movable {
        var location: CGPoint

        init(atLocation location: CGPoint) {
            self.location = location
        }
    }

    class Bike: Movable {
        var x: Int

        init(atX x: Int) {
            self.x = x
        }
}