Could you please write this in swift code and update it in the swift class below

please define a Discountable protocol, in which has a function func discount( _ itemName: String) -> Double. Update the Item class, which conforms to this protocol and implements the discount function. When the input item name is apple2, the discount amount is 0.3, for other item names, the discount is 0.0. The following is the example inputs and outputs:

public class Item {

private var name:String

private var price:Double

private var quantity:Int

public init(itemName:String,itemPrice:Double,numPurchased:Int){

self.name = itemName

self.price = itemPrice

self.quantity = numPurchased

}

public func toString()->String{

let formatter = NumberFormatter()

formatter.locale = Locale.current

formatter.numberStyle = .currency

let formatePrice = formatter.string(from: price as NSNumber)!

let formatePriceQuantity = formatter.string(from: price*Double(quantity) as NSNumber)!

var str = (name + "\t" + formatePrice + "\t" + String(quantity))

str += ("\t" + formatePriceQuantity)

return str

}

public func getPrice()->Double{

return price;

}

public func getName()->String{

return name;

}

public func getQuantity()->Int{

return quantity;

}

}