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

Michel Ortega
Michel Ortega
2,279 Points
Posted by Michel Ortega
Michel Ortega
2,279 Points

where should I init location?

Im confused about where to init a <local> property of a sub-class, in this case <location>. Am I supposed to init it inside the override init method? SOS xoxo

classes.swift 
class Point {
    var x: Int
    var y: Int

    init(x: Int, y: Int){
        self.x = x
        self.y = y
    }
}


class Machine: Point {
    var location: Point


    override init(x: Int, y: Int){
        super.init(x: x, y: y, location: Point)

        self.location = location
        self.x = x
        self.y = y
    }


    func move(direction: String) {
        print("Do nothing! Im a machine!")
    }
}

// Enter your code below

class Robot: Machine{

    override init(x: Int, y: Int){
        super.init(x: x, y: y)

        self.x = x
        self.y = y
    }

    override func move(direction: String){

        switch direction{

        case "Up":
            self.y += 1

        case "Left":
            self.x += 1
        default:
            break

        }

    }


}

1 Answer

Drew Butcher
Drew Butcher
33,160 Points
Drew Butcher
Drew Butcher
33,160 Points

your close... you can remove the 

 override init(x: Int, y: Int){
        super.init(x: x, y: y)
        self.x = x
        self.y = y
    }

you don't need to override the init function of Machine it's cool just the way it is :)

Your override of Machine is looking good just a couple of corrections

override func move(direction: String){
        switch direction{
        case "Up":
            location.y += 1
        case "Left":
            location.x -= 1
        case "Down":
            location.y -= 1
        case "Right":
            location.x += 1
        default:
            break
        }
    }

I hope that helps.

Best, Drew