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iOS Delegates in Swift 2 Introduction to Delegates Modeling a Race Game

Anthony Lafont
Anthony Lafont
17,075 Points

compiler error: 'new()' is unavailable in Swift: use object initializers instead, even in the teachers note files

There is an error in the class HorseRace at the line raceTracker.startTime = NSDate.new() It says "'new()' is unavailable in Swift: use object initializers instead" Do you know how to fix it?

import Foundation

// Participants

struct Horse {
    func giddyUp() {}

struct Car {
    func vroomVroom() {}

struct RaceCar {
    func readySetGo() {}

// Tracker

class Tracker {
    var laps: Int = 0
    var startTime: NSDate?
    var lapFirst: Horse?
    var winner: Horse?

// Races

class Race {
    var laps: Int = 0
    let raceTracker: Tracker = Tracker()

    func start() {
        // Some set up

    func updateProgress() {


    func end() {
        // Some tear down

class HorseRace: Race {

    let participants: [Horse]

    init(laps: Int, horses: [Horse]) {
        self.participants = horses
        self.laps = laps

    override func start() {
        print("Starting Race!")
        raceTracker.startTime = NSDate.new()
        for horse in participants {

    override func updateProgress() {
        raceTracker.laps += 1
        raceTracker.lapFirst = participants.first
        print("Progress updated!")
    override func end() {
        print("And the winner is...\(participants.first)")
        raceTracker.winner = participants.first

// Usage

let horse1 = Horse()
let horse2 = Horse()
let horse3 = Horse()

let race = HorseRace(laps: 4, horses: [horse1, horse2, horse3])

1 Answer

Hi Anthony,

Instead of

raceTracker.startTime = NSDate.new()


raceTracker.startTime = NSDate()

Hope that helps

KB :octopus: