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

How can I change position of Robot?

Help me please!

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 {
       override func move(direction: String) {
        switch direction{
        case "Up": location = Point(x: self.location.x + 1, y: self.location.y + 0)
    //here will be rest of "switch"
        default: break
        }
    }


}

1 Answer

Michael Reining
Michael Reining
10,101 Points

Hi Andrey,

Moving the location of the robot is actually a bit simpler. There are two simple ways of updating it.

See below.

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": self.location.y = self.location.y + 1
        case "Down": self.location.y = self.location.y - 1
        case "Left": self.location.x--
        case "Right": self.location.x++
        default: break
        }
    }
}

// Then test it in the Playground

let myRobot = Robot()
myRobot.move("Right")
print("Point X: \(myRobot.location.x), Point Y: \(myRobot.location.y)")

As you can see, I tested this in the Playground. It really helps to visualize everything and see what is going on.

I hope that helps,

Mike

PS: Thanks to the awesome resources on Team Treehouse, I launched my first app.

Now you can practice writing Swift code directly on your iPhone :-)

Code! Learn how to program with Swift

Thank you!)one more time)