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

Adam Beck
Adam Beck
9,345 Points

Not sure how to set up robot's move method.

I'm stuck on this code challenge. As soon as I get to the last part of the question - I can't understand how achieve the goal..

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!")
    }
}

class Robot: Machine {
    override func move(direction: String) {

    }
}

1 Answer

David Mohler
David Mohler
1,814 Points

This should work.

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++
            case "Down": location.y--
            case "Left": location.x--
            case "Right": location.x++
            default: break
        }
    }
}
Adam Beck
Adam Beck
9,345 Points

Thanks so much! Your code worked perfect. I tried again earlier with example:

case: "Up" location.y += 1

etc. etc. and it did not work, is that really the same as your example?