Enum:类型变量的开关大小写

Question

为什么当我试图打开和可选的，其中有enum friendstate我得到一个错误，当我试图在下面的开关语句应用它?提供的错误是

在类型"friendState!"中找不到枚举大小写"已添加"。"

(错误在所有情况下重复)

有办法修复这个错误吗?

var usernameText : String!
var UID : Int!
var userDetails : UserState?
var buttonText : String{
    switch(userDetails!.state){
    case .added:
        return "remove"//error occurs
    case .incoming:
        return "accept"//error occurs
    case .outgoing:
        return "cancel"//error occurs
    }
}
func setup(){
    ActButton.setTitle(buttonText, forState: .Normal)
}

enum friendState : Int,Printable{
case incoming,added,outgoing
var description : String{
    switch(self){
    case .incoming:
        return "incoming"
    case .added:
        return "Friends"
    case .outgoing:
        return "outgoing"
    }
  }
}

class UserState : Printable , Hashable{
var uid : Int!
var username : String
var isFollowing : Bool
var state : friendState!
var RequestForUser : Request?
init( username : String, isFollowing : Bool, state : friendState, uid :Int){
    self.username = username
    self.isFollowing = isFollowing
    self.state = state
    self.uid = uid
}
var hashValue : Int {
    get{
        return uid
    }
}
var description : String{
    return "UserName: (username) Following : (isFollowing) Association: (state) n"
}

}

Answer 1

函数var buttonText : String

换行:

switch(userDetails!.state)

switch(userDetails!.state!)

你需要打开userDetails可选状态