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iOS Object-Oriented Swift 2.0 Classes Building a Tower

boris said
boris said
3,607 Points
Posted by boris said
boris said
3,607 Points

X-Code giving error that I can not assign type 'Point' to 'Int' in enemy class. Happened after tower was created

Can somebody please tell me why this is happening. Thank you in advanced Here is my code:

let x1 = 0
let y1 = 0

let coordinate1: (x: Int, y: Int) = (0, 0)

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

    func surroundingPoints(withRange range: Int = 1) -> [Point]{

        var results: [Point] = []

        for xCoord in (x-range)...(x+range) {
            for yCoord in (y-range)...(y+range) {
                let coordinatePoint = Point(x: xCoord, y: yCoord)
                results.append(coordinatePoint)
            }
        }
      return results

    }

}

let coordinatePoint = Point(x: 2, y: 2)

coordinatePoint.surroundingPoints()





class Enemy {
    var life = 2
    let position: Int = 1
    var strength: Int = 1

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



    func decreaseHealth(factor: Int) {
        life = life - factor
    }

}
class Tower {
    let position: Point
    var range = 1

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

1 Answer

Nikki Bearman
Nikki Bearman
3,389 Points
Nikki Bearman
Nikki Bearman
3,389 Points

Hi Boris,

There are a couple of minor errors/mix ups I've found in the code you've provided, which I think are just copywriting errors so just worth checking over quite closely in future. It's easy to do though, I've done the same many times!

Within class Enemy, you have entered:

var life = 2
let position: Int = 1
var strength: Int = 1

This should actually be:

var life = 2
let position: Point
var strength: Int = 1

You have entered the constant position as type Int = 1 when it should have been type Point. This explains why you were receiving the error "could not assign type 'Point' to 'Int'". You entered self.position = Point(x: x, y: y) and so it was trying to assign Point which opposes the type Int you set earlier.

Just as a heads up I also noticed that within your class Tower you have entered:

var range = 1

This should actually be:

var range: Int = 1

So with everything corrected the code should be as below:

struct Point {
    let x: Int
    let y: Int

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

    func surroundingPoints(withRange range: Int = 1) -> [Point] {
        var results: [Point] = []
        for xCoord in (x-range)...(x+range){
            for yCoord in (y-range)...(y+range) {
                let coordinatePoint = Point(x: xCoord, y: yCoord)
                results.append(coordinatePoint)
            }
        }
        return results
}}


let coordinatePoint = Point(x: 2, y: 2)
coordinatePoint.surroundingPoints()

class Enemy {
    var life = 2
    let position: Point
    var strength: Int = 1

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

    func decreaseHealth(factor: Int) {
        life = life - factor
}}

class Tower {
    let position: Point
    var range: Int = 1
    var strength: Int = 1

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

Hope that helps but let me know if you have any questions.

Nikki