We are using enums for some basic data structures like this:
enum Industry: String {
case Industry1 = "Industry 1", Industry2 = "Industry 2", Industry3 = "Industry 3"
static let allValues = [Industry1, Industry2, Industry3]
}
When we store the values in our database we store them as Ints/numbers. So for example the value for Industry might be 2 which would be Industry2.
How do I map the value 2, back to the relevant item in the enum? So I can retrieve the string value back?
You can do this to have arbitrary industry names:
enum Industry: Int {
case Industry1 = 1, Industry2, Industry3
static let allValues = [Industry1, Industry2, Industry3]
func industryName() -> String {
switch self {
case .Industry1: return "Industry A"
case .Industry2: return "Industry B"
case .Industry3: return "Industry C"
}
}
}
Example of usage:
let industry = Industry(rawValue: 2)
industry?.industryName() // prints "Industry B"
Industry is not represented in better way. You should pack industry name and code together in a better structure like this:
struct Industry {
var name: String
var code: Int
}
Now you could create a store class that can contain all industries. Through enum you are not representing it very well. For saving one thing and displaying other thing.
Now if you have to save you can industry.code
And if you want to display industry.name
T!? It's just bad practice to put ! everywhere in Swift code.Based on your setup you could do:
let n = 2
let stringValue = Industry.allValues[n - 1].rawValue
