Swift struct not finding members - struct

Question

I have this struct:
struct Direction {
let Left = CGPoint(x: -1, y: 0)
let Top = CGPoint(x: 0, y: -1)
let Right = CGPoint(x: 1, y: 0)
let Down = CGPoint(x: 0, y: 1)
let TopLeft = CGPoint(x: -1, y: -1)
let TopRight = CGPoint(x: 1, y: -1)
let DownLeft = CGPoint(x: -1, y: 1)
let DownRight = CGPoint(x: 1, y: 1)
let None = CGPointZero
}
And I try to use it like this:
class AClass {
var point:CGPoint!
init() {
self.point = Direction.None // Direction.Type does not have a member named 'None'
}
}
I've tried to set .None to a var and public but I don't seem to understand this.

Answer 1

Seems that you are trying to use static members of the struct, but you have only declared instance members. Add static to all properties.
struct Direction {
static let Left = CGPoint(x: -1, y: 0)
static let Top = CGPoint(x: 0, y: -1)
static let Right = CGPoint(x: 1, y: 0)
static let Down = CGPoint(x: 0, y: 1)
static let TopLeft = CGPoint(x: -1, y: -1)
static let TopRight = CGPoint(x: 1, y: -1)
static let DownLeft = CGPoint(x: -1, y: 1)
static let DownRight = CGPoint(x: 1, y: 1)
static let None = CGPointZero
}

Answer 2

If #Kirsteins's supposition is correct, and you need to use the struct values as static properties, then there's an alternative way of achieving the same result, but in my opinion in a better way: using an enum.
But swift enums accept characters, strings and numbers as raw values only, whereas a CGPoint is made up of a pair of floats. Fortunately swift gives us the capability of using a string literal to specify the pair, which is then converted into a CGFloat:
extension CGPoint : StringLiteralConvertible {
public static func convertFromStringLiteral(value: StringLiteralType) -> CGPoint {
return CGPointFromString(value)
}
public static func convertFromExtendedGraphemeClusterLiteral(value: StringLiteralType) -> CGPoint {
return convertFromStringLiteral(value)
}
}
This extension allows us to initialize a CGFloat as follows:
let point: CGPoint = "{1, -3}"
With that in our hands, we can define an enum as follows:
enum Direction : CGPoint {
case Left = "{-1, 0}"
case Top = "{0, -1}"
case Right = "{1, 0}"
case Down = "{0, 1}"
case TopLeft = "{-1, -1}"
case TopRight = "{1, -1}"
case DownLeft = "{-1, 1}"
case DownRight = "{1, 1}"
case None = "{0, 0}"
}
and use in your code snippet as:
class AClass {
var point:CGPoint!
init() {
self.point = Direction.None.toRaw()
}
}