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iOS Build a Simple iPhone App with Swift Getting Started with iOS Development Swift Recap Part 2

Will pass in Xcode But will not pass in treehouse

Can someone please explain to me what I am doing wrong with my code here??

robots.swift
class Point {
  var x: Int
  var y: Int

  init(x: Int, y: Int) {
    self.x = x
    self.y = y
  }
}

class Machine {
  var location: Point

  init() {
    self.location = Point(x: 0, y: 0)
  }

  func move(_ direction: String) {
    print("Do nothing! I am a machine!")
  }
}

// Enter your code below

class Robot: Machine{

    override func move(_ direction: String) {
        switch direction {
        case "Up": return Machine.init().location.y += 1
        case "Down": return Machine.init().location.y -= 1
        case "Left": return Machine.init().location.x -= 1
        case "Right": return Machine.init().location.x += 1
        default: move(" ")
        }
    }

}

1 Answer

Robot is already a subclass of Machine so you just need to access it with 'location'.

class Robot: Machine{

    override func move(_ direction: String) {
        switch direction {
        case "Up": return location.y += 1
        case "Down": return location.y -= 1
        case "Left": return location.x -= 1
        case "Right": return location.x += 1
        default: move(" ")
        }
    }
}