Is there a way to get a string representation of a field name in Swift?

In Swift you can easily get a string representation of an enumeration's case name, like so...

enum Foo
{
    case laa1
    case laa2
    case laa3
}

let varHoldingTheStringLaa1 = String(Foo.laa1)

However, I can't figure out how to do the same for a class member, like so...

class Foo
{
    var laa1:String = ""
    var laa2:String = ""
    var laa3:String = ""
}

// None of these work...
let varHoldingTheStringLaa1 = String(laa1)     // Returns the value stored in laa1
let varHoldingTheStringLaa1 = String(Foo.laa1) // Won't even compile

So how can one get the member name stored in a variable?