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

Posted by Evan Bloom
Evan Bloom
2,607 Points

What am I doing wrong?

I am not sure what I am doing wrong.

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!")
  }
}

// Enter your code below
class Robot: Machine {
    override func move(_ direction: String) {
    switch _ direction {
       case "Up" : location.y += 1
       case "Down" : location.y -= 1
       case "Left" : location.x -= 1
       case "Right" : location.x += 1  
       default : break
    }
  }
}

1 Answer

Alexandra Barnett
seal-mask
.a{fill-rule:evenodd;}techdegree seal-36
Alexandra Barnett
Front End Web Development Techdegree Graduate 46,473 Points
Alexandra Barnett
.a{fill-rule:evenodd;}techdegree seal-36
Alexandra Barnett
Front End Web Development Techdegree Graduate 46,473 Points

Hi Evan! You've nearly got it - just one little bit:

When you do the switch statement, you only need to switch on the word direction - the underscore is what is used when calling the method later:

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

Hope that helps - let me know if you have any questions ???

Evan Bloom
Evan Bloom
2,607 Points

Thanks a lot Alexandra! I looked at other people's code before and still couldn't get it, but I did as you told and it worked. Thanks again! :)