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iOS Object-Oriented Swift Classes in Swift Helper Methods

Posted by Eddie Aguilar
Eddie Aguilar
2,393 Points

I don't understand why my class of tower will not work can someone please look over this and give me an explanation??

PLEASE HELP

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)
}

func fire(at enemy: Enemy){
    if isInRange(of: enemy) {
        enemy.decreaseLife(by: strength)
        print("Gotcha")
    } else { print("Darn, out of range")


    }

}

func isInRange(of enemy: Enemy) ->Bool{
 let availablePositions = position.points(inrange: range)

    for point in availablePositions{
        if point.x == enemy.position.x && point.y == enemy.position.y {
        return true
        }
    }
    //return false
}

}

1 Answer

Sarah Hurtgen
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Sarah Hurtgen
Treehouse Project Reviewer
Sarah Hurtgen
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Sarah Hurtgen
Treehouse Project Reviewer

Hi! I'm assuming that you have been following along with Pasan and this is just a snippet of your code? If you have struct Point and class Enemy defined exactly as Pasan did from the previous videos - I think the issue is just a typo.

In your lines 

    func isInRange(of enemy: Enemy) ->Bool{
        let availablePositions = position.points(inrange: range)

the "r" in "inrange" needs to be capitalized:

        let availablePositions = position.points(inRange: range)

If you then uncomment out your 

// return false

to be 

return false

It should then work as expected. If you do not have Point and Enemy defined according to the videos, I'm guessing the issue is coming from there.

Hope that helps!

Sarah Hurtgen
seal-mask
.a{fill-rule:evenodd;}techdegree seal-36
Sarah Hurtgen
Treehouse Project Reviewer
Sarah Hurtgen
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Sarah Hurtgen
Treehouse Project Reviewer

Also, just a tip - If you find yourself getting stuck while working through the videos, keep in mind that you can download the code for the courses in the "Downloads" section of each video. Then you can compare your own code side by side to the teachers and sometimes that helps to spot any differences that could be causing issues!

Eddie Aguilar
Eddie Aguilar
2,393 Points

I had no idea that you could download the already written code. That was very helpful for this section. Thank you very very much