DeepCopyDemo.swift

import Foundation

class Animal: NSCopying {
    var name: String
    
    init(name: String) {
        self.name = name
    }
    
    func copy(with zone: NSZone? = nil) -> Any {
        return Animal(name: name)
    }
}


let animal = Animal(name: "Zebra")
let animalCopy = animal.copy() as! Animal

animal.name = "Lion"

print(animal.name) // Lion
print(animalCopy.name) // Zebra