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

Ethan Barrie
Ethan Barrie
2,628 Points
Posted by Ethan Barrie
Ethan Barrie
2,628 Points

Why is this code wrong?

It works in XCode.

2 Answers

Brendan Whiting
seal-mask
.a{fill-rule:evenodd;}techdegree seal-36
Brendan Whiting
Front End Web Development Techdegree Graduate 84,735 Points
Brendan Whiting
.a{fill-rule:evenodd;}techdegree seal-36
Brendan Whiting
Front End Web Development Techdegree Graduate 84,735 Points

The problem is the override init() method in the Robot class. Just get rid of that method and everything works. (I think somehow you were under the misconception that the robots should be initialized with a different point of origin, but this is not the case. Since that means it will have different coordinates after using the move function than the challenge is expecting, it doesn't pass)

Ethan Barrie
Ethan Barrie
2,628 Points
Ethan Barrie
Ethan Barrie
2,628 Points

Thanks! Worked perfectly after this.

Evan Demaris
Evan Demaris
64,262 Points
Evan Demaris
Evan Demaris
64,262 Points

Hi Ethan, it looks like you didn't include your code with your question, so we can't answer what's wrong with it.

Ethan Barrie
Ethan Barrie
2,628 Points
Ethan Barrie
Ethan Barrie
2,628 Points

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 init(){
    super.init()
    self.location = Point(x: 1, y: 1)
}

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

}