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

Posted by Unsubscribed User
Unsubscribed User
Courses Plus Student 2,233 Points

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
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!

Unsubscribed User
PLUS
Unsubscribed User
Courses Plus Student 2,233 Points
Unsubscribed User
Unsubscribed User
Courses Plus Student 2,233 Points

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

Unsubscribed User
PLUS
Unsubscribed User
Courses Plus Student 2,233 Points
Unsubscribed User
Unsubscribed User
Courses Plus Student 2,233 Points

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

the proplem is (lldb_expr_152)

it's every-time appear