声明枚举

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

也可以使用一个case

enum Direct {
    case North, East, South
}

使用枚举

var dirct = Direction.East
dirct = .West

相关值

可以使用枚举存储任何相关指

enum PersonInfo {
    case Age(Int)
    case Name(String)
}

var person = PersonInfo.Name("ttf")
switch person {
case .Age(let age)://获得这个值
    print("person's age is \(age)")
case .Name(let name):
    print("person'name is \(name)")
}

有初始值的枚举

/**
以字符为初始值的枚举
*/
enum DirWithChar: Character {
    case North = "\t"
    case West = "\n"
    case East = "\0"
    case South = "\r"
}

/**
以Int为初始值的枚举
*/
enum DirWithInt: Int {
    case North = 0
    case West
    case East
    case South
}

获得初始值

let dirValue = DirWithInt.East.rawValue