The raw type that can be used to represent all values of the conforming type.

Every distinct value of the conforming type has a corresponding unique value of the RawValue type, but there may be values of the RawValue type that don’t have a corresponding value of the conforming type.

Creates a new instance with the specified raw value.

If there is no value of the type that corresponds with the specified raw value, this initializer returns nil. For example:

enum PaperSize: String {
    case A4, A5, Letter, Legal
}

print(PaperSize(rawValue: "Legal"))
// Prints "Optional("PaperSize.Legal")"

print(PaperSize(rawValue: "Tabloid"))
// Prints "nil"

The corresponding value of the raw type.

A new instance initialized with rawValue will be equivalent to this instance. For example:

enum PaperSize: String {
    case A4, A5, Letter, Legal
}

let selectedSize = PaperSize.Letter
print(selectedSize.rawValue)
// Prints "Letter"

print(selectedSize == PaperSize(rawValue: selectedSize.rawValue)!)
// Prints "true"