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

method overrride

I want to help with this test

robots.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) {


        if direction == "Up"{
            self.location = Point(x: 0, y: 1)
        }else{
        if direction == "Down"{
            self.location = Point(x: 0, y: 1)
            }else{
        if direction == "Left"{
            self.location = Point(x: 1, y: 0)
                }else{
        if direction == "Right"{
            self.location = Point(x: 1, y: 0)
                    }else{
            self.location = Point(x: 0, y: 0)
            }}}}
    }

}

3 Answers

Thomas Dobson
Thomas Dobson
7,511 Points

Mohammed,

You struggled quite a bit with your If statements syntax. In addition your not really setting your location correctly. Your setting location to a specific point. For example up will take you to (0,1) instead of moving your y axis up by 1.

Here is how your code should have looked:

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)
    {


        if direction == "Up"
        {
            location.y += 1
        }
        else if direction == "Down"
        {
            location.y -= 1
        }
        else if direction == "Left"
        {
            location.x -= 1
        }
        else if direction == "Right"
        {
            location.x += 1
        }
    }

}

furthermore I wanted to provide you a switch version of code as well. We strive for readability with Swift, that if statement is scary and I think is better represented using a switch statement.

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 += 1
            case "Down" : location.y -= 1
            case "Right" : location.x += 1
            case "Left" : location.x -= 1
            default:  print("Invalid Movement Command")
        }
    }

}

Much easier to read if you ask me!

Be sure you understand the concepts from this code challenge. They are pretty important moving forward!

Thanks, I thought the shapes were just in (override Initializer)

I want to ask about a problem in (Xcode), regarding the output screen

the proplem is (lldb_expr_152)

it's every-time appear