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

Ádám Csányi
PLUS
Ádám Csányi
Courses Plus Student 2,833 Points

Can's figure this one out. I need help :D

I would appreciate some help. I am very stuck on this question. Tried this code from some other tree house discussions after getting very frustrated with my own code which was not working. :D

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'm a machine!")
  }
}


class Robot: Machine {
    override func move(direction: String) {
        switch(direction) {
            case "Up":
                self.location.y++
            case "Down":
                self.location.y--
            case "Left":
                self.location.x--
            case "Right":
                self.location.x++
            default:
                break
        }
    }

1 Answer

Hey Ádám,

There are no ++ or -- operators in Swift. Change those to something like += or -= and you should be able to pass the Challenge ;)