caser1 =1

caser2 =2

caser3 =3

funcdescription()->String{//enum转String

switch(self){

caser1:

return"R1";

caser2:

"R2";

caser3:

"R3";

}

}

}

varr:rank=rank.r2;//普通初始化

varrraw =r.rawValue;//enum to int

println(.description());//enum转String

letnewr =rank(rawValue:3);//int to enum