How to get string case name of a enum whose rawType is Int [duplicate]

Question

I want a enumeration of countries, like:

enum Country: Int {
    case Afghanistan
    case Albania
    case Algeria
    case Andorra
    //...
}

There are two main reasons why I choose Int as its rawValue type:

I want to determine the total count of this enumeration, using Int as rawValue type simplifies this:

enum Country: Int {
    case Afghanistan
    // other cases
    static let count: Int = {
        var max: Int = 0
        while let _ = Country(rawValue: max) { max = max + 1 }
        return max
    }()
}

I also need a complicated data structure that represents a country, and there is an array of that data structure. I can easily subscript-access certain country from this array using Int-valued enumeration.
```
struct CountryData {
     var population: Int
     var GDP: Float
}

var countries: [CountryData]

print(countries[Country.Afghanistan.rawValue].population)
```

Now, I somehow need to convert a certain Country case to String(aka. something like

let a = Country.Afghanistan.description // is "Afghanistan"

Since there are lots of cases, manually writing a conversion-table-like function seems unacceptable.

So, how can I get these features at once ?:

Use enumeration so potential typo-caused bugs can be found during compile time. (Country.Afganistan won't compile, there should be an 'h' after 'g', but some approach like countries["Afganistan"] will compile and may cause runtime errors)
Be able to determine the total country count programmatically (likely to be able to determine at the compile time, but I don't want to use a literal value and keep in mind to change it properly every time I add or remove a country)
Be able to easily subscript-like access a metadata array.
Be able to get a string of a case.

Using enum Country: Int satisfies 1, 2, 3 but not 4

Using enum Country: String satisfies 1, 3, 4 but not 2 (use Dictionary instead of Array)

This question is not a duplicate, the "rawType is Int" in this question is unique and essential the question. Answers there say to re-declare the enum as a String type. — pkamb
– pkamb, Commented Jul 25, 2019 at 1:24

PGDev · Accepted Answer · 2017-03-21 10:28:19Z

9

To print an enum's case as String, use:

String(describing: Country.Afghanistan)

You can create you data structure something like:

enum Country
{
    case Afghanistan
    case Albania
    case Algeria
    case Andorra
}

struct CountryData
{
    var name : Country
    var population: Int
    var GDP: Float
}

var countries = [CountryData]()
countries.append(CountryData(name: .Afghanistan, population: 2000, GDP: 23.1))
print(countries[0].name)

edited Mar 21, 2017 at 10:28

answered Mar 21, 2017 at 10:20

PGDev

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1 Comment

pkamb Over a year ago

This answer appears to now be outdated in Swift 5.

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