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

Fernando Dedios
Fernando Dedios
2,760 Points
Posted by Fernando Dedios
Fernando Dedios
2,760 Points

Im stuck :(

Hi, Im a little confuse about how to fill the switch method. I want to change the coordinates which are a Point type. Any help?

Thanks a lot

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! Im a machine!")
    }
}

// Enter your code below
class Robot: Machine {
    override func move(direction: String) {
        let moveRobot: String
        switch moveRobot {
        case "Up": Point(x: x, y: y+1)
            case "Down": Point(x: x, y: y-1)
            case "Left": Point(x: x-1, y: y)
        case "Right": Point(x: x+1, y:y)
        default: print("BREAK!")
        }
    }
}

1 Answer

jcorum
jcorum
71,830 Points
jcorum
jcorum
71,830 Points

Fernando, try this:

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

You need to override the move method inherited from Machine. It takes one parameter: direction. You switch on that, using the 4 cases. Each time you either increment or decrement the x or y values of location. You also have to have a default.