Swift的枚举也是值类型。同样，在赋值或传递时会复制。 enum Direction { case north case south case east case west}var dir1 = Direction.northvar dir2 = dir1if dir2 == dir1 { print("They are equal") // 输出They are equal，说明是复制的副本比较相等} 枚举赋值时要注意是值的复制，不是引用。