为什么我不能用这样的原始值定义枚举？
enum Edges : (Double,Double) {
case TopLeft = (0.0,0.0)
case TopRight = (1.0,0.0)
case BottomLeft = (0.0,1.0)
case BottomRight = (1.0,1.0)
}
Because：
原文链接：https://www.f2er.com/swift/320106.htmlRaw values can be strings,characters,or any of the integer or floating-point number types.
但是有一个替代解决方案：
enum Edges {
case TopLeft
case TopRight
case BottomLeft
case BottomRight
func getTuple() -> (Double,Double) {
switch self {
case .TopLeft:
return (0.0,0.0)
case .TopRight:
return (1.0,0.0)
case .BottomLeft:
return (0.0,1.0)
case .BottomRight:
return (1.0,1.0)
}
}
}
let a = Edges.BottomLeft
a.getTuple() // returning (0,1)
