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

Christian Hvatum
Christian Hvatum
3,822 Points

"Could not compile..." error, but no compiler errors in the preview-window.

I copied the code into a swiftPlayground and the location returns some wierd string(?) "__lldb_expr_709.Point". No compiler errors tho.

May it be my code?

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 {
    init(x: Int, y: Int) {
        Machine.init()
    }

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

1 Answer

Kagisho Moroka
Kagisho Moroka
8,716 Points

Hi,

The challenge wants you to override the func move. Try to add override before your method in the Robot class.

Happy coding.

Kagisho Moroka
Kagisho Moroka
8,716 Points

Also, I don't think you need the initializer in the Robot class as the challenge didn't ask to add any new properties to the Robot vs. machine

Christian Hvatum
Christian Hvatum
3,822 Points

Thanks, the problem was in the init in the Robot class. As you said i did not need it.