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

Posted by Ryan Kavanaugh
Ryan Kavanaugh
114 Points

Trying to move a robot around

I am struggling to figure out how to reset the location of a "machine" with a subclass called "robot".

I inserted comments where I am getting the current error. I am having trouble figuring out how I can insert (the x co-ordinate, the y co-ordinate + 1).

Any ideas? Thanks!

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! Im a machine!")
  }
}

// Enter your code below

  class Robot: Machine {

    func movenow(_ direction: String) {

      let input = readLine()

      //Looking FOR HELP HERE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
      if input == "Up"{
        self.location = Point(x: 0, y: y += 1)
       //HERE^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      }
    }

  }

3 Answers

Jeremy Conley
Jeremy Conley
4,791 Points
Jeremy Conley
Jeremy Conley
4,791 Points 
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!")
    }
}

// Enter your code below

class Robot: Machine {
    override func move(_ direction: String) {
        switch direction {
        case "Up": self.location.y += 1
        case "Down": self.location.y -= 1
        case "Left": self.location.x -= 1
        case "Right": self.location.x += 1
        default: break
        }
    }
}
Ryan Kavanaugh
Ryan Kavanaugh
114 Points
Ryan Kavanaugh
Ryan Kavanaugh
114 Points

It gave some compile errors about spaces needed for "newLocation:Int" as such. I put the spaces where it made sense that they should go and then re-ran the code with still having syntax errors, mostly about ","s.

Ryan Kavanaugh
Ryan Kavanaugh
114 Points
Ryan Kavanaugh
Ryan Kavanaugh
114 Points

I did that and know I have an " Bummer! For the Up direction make sure the location's y property increases by 1" error... Not sure if its the course or the code