如何在Swift中的两个枚举之间切换？

enum Direction {
    case north
    case south
    case east
    case west
}

var currentDirection: Direction = .north

// 切换到另一个方向
if currentDirection == .north {
    currentDirection = .south
} else if currentDirection == .south {
    currentDirection = .east
} else if currentDirection == .east {
    currentDirection = .west
} else {
    currentDirection = .north
}

enum Direction: String {
    case north = "North"
    case south = "South"
    case east = "East"
    case west = "West"
}

var currentDirection: Direction = .north

// 使用原始值进行切换
if let rawValue = currentDirection.rawValue {
    if rawValue == "North" {
        currentDirection = .south
    } else if rawValue == "South" {
        currentDirection = .east
    } else if rawValue == "East" {
        currentDirection = .west
    } else {
        currentDirection = .north
    }
}

enum Direction {
    case north(speed: Int)
    case south(speed: Int)
    case east(speed: Int)
    case west(speed: Int)
}

var currentDirection: Direction = .north(speed: 10)

// 切换到另一个方向
switch currentDirection {
case .north(let speed):
    currentDirection = .south(speed: speed)
case .south(let speed):
    currentDirection = .east(speed: speed)
case .east(let speed):
    currentDirection = .west(speed: speed)
case .west(let speed):
    currentDirection = .north(speed: speed)
}