Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

iOS Build a Simple iPhone App with Swift 2.0 Getting Started with iOS Development Swift Recap Part 2

Posted by Sergio Pichardo
Sergio Pichardo
24,963 Points

Swift Recap Part 2

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

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
    }
}

}

let robot = Robot(x: 0, y: 0) robot.location robot.move("Down") robot.location

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

    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
        }
    }
}
Sergio Pichardo
Sergio Pichardo
24,963 Points

Hi, I'm stuck in this part of the swift recap part 2. Could you please take a look at my code, and help me out? It won't pass the test. :) Thanks!.

1 Answer

Paul Brazell
Paul Brazell
14,371 Points
Paul Brazell
Paul Brazell
14,371 Points

Your left and right cases are backwards. If you are moving to the right, you would be adding to the x value. If you are going to the left, you would decrease x. Here is the solution:

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
        }
    }
}