Service locator in swift

ServiceLocator.swift

//: Playground - noun: a place where people can play

import UIKit

var str = "Hello, playground"

class ServiceLocator {
    private var registry : [String: Any] = [:]
    
    func registerService<T>(service: T) {
        let key = "\(T.self)"
        registry[key] = service
    }
    
    func tryGetService<T>() -> T? {
        let key = "\(T.self)"
        return registry[key] as? T
    }
    
    func getService<T>() -> T {
        let key = "\(T.self)"
        return registry[key] as! T
    }
}




let locator = ServiceLocator()

protocol Cat {
    func meow() -> String
}

protocol Dog {
    func bark() -> String
}


class Murzik : Cat {
    func meow() -> String {
        return "Meeooow"
    }
}

class Muhtar : Dog {
    func bark() -> String {
        return "Woof"
    }
}


locator.registerService(Murzik() as Cat)
locator.registerService(Muhtar() as Dog)

let cat : Cat? = locator.tryGetService()
let dog : Dog = locator.getService()

cat?.meow()
dog.bark()