ios - swift : Enum constant with type and value

Question

我知道，枚举常量在swift中应该是这样的

enum CompassPoint {
    case North
    case South
    case East
    case West
}

但是如何给第一个元素赋值，如下面的Objective-C代码

enum ShareButtonID : NSInteger
{
   ShareButtonIDFB = 100,
   ShareButtonIDTwitter,
   ShareButtonIDGoogleplus

}ShareButtonID;

Answer 1

你需要给枚举一个类型然后设置值，在下面的例子中North设置为100，其余的将是101、102 等，就像在 C 和 Objective-C 中一样。

enum CompassPoint: Int {
    case North = 100, South, East, West
}

let rawNorth = CompassPoint.North.rawValue // => 100
let rawSouth = CompassPoint.South.rawValue // => 101
// etc.

更新:将toRaw()替换为rawValue。