Update / change the rawValue of a enum in Swift

问题

Taking the below enum for instance

enum Name : String {

  case Me = "Prakash"
  case You = "Raman"

}

Can I do the following

Change the raw value of one "case" to something else.

Name.Me = "Prak"

Add a new case to the ENUM

Name.Last = "Benjamin"

Thanks!

回答1:

Short answer: No, you can't.

Enumeration types are evaluated at compile time.
It's not possible to change raw values nor to add cases at runtime.

The only dynamic behavior is using associated values.

Reference: Swift Language Guide: Enumerations

回答2:

No you cannot. Instead You can redefine your enum to contain associated values instead of raw values.

enum Name {
    case Me(String)
    case You(String)
    case Last(String)
}

var me = Name.Me("Prakash")
print(me)
me = .You("Raman")
print(me)
me = .Last("Singh")
print(me)

来源：https://stackoverflow.com/questions/35574928/update-change-the-rawvalue-of-a-enum-in-swift