Swift结构找不到成员

仲裁人

我有这个结构：

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
}

我尝试像这样使用它：

class AClass {
    var point:CGPoint!

    init() {
        self.point = Direction.None // Direction.Type does not have a member named 'None'
    }
}

我尝试将其设置.None为var，public但是我似乎不太明白。

柯斯坦斯

似乎您正在尝试使用该结构的静态成员，但是您仅声明了实例成员。添加static到所有属性。

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
}

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