CODEWITHSUNDEEP
swiftenumstuples
Wex
Wex

Reputation: 4696

Is it possible to put a tuple in an enum with Swift?

If I have the following enum:

enum FruitTuple
{
    static let Apple = (shape:"round",colour:"red")
    static let Orange = (shape:"round",colour:"orange")
    static let Banana = (shape:"long",colour:"yellow")
}

Then I have the following function:

static func PrintFruit(fruit:FruitTuple)
{
    let shape:String = fruit.shape
    let colour:String = fruit.colour

    print("Fruit is \(shape) and \(colour)")
}

On the fruit.shape and fruit.colour I get the error:

Value of type 'FruitTuple' has no member 'shape'

Fair enough, so I alter the enum to have a type:

enum FruitTuple:(shape:String, colour:String)
{
    static let Apple = (shape:"round",colour:"red")
    static let Orange = (shape:"round",colour:"orange")
    static let Banana = (shape:"long",colour:"yellow")
}

But then on the enum declaration I get the error:

Inheritance from non-named type '(shape: String, colour: String)'

So, the question is: Is it even possible to have a tuple in an enum and be able to reference it's component parts in such a way? Am I just missing something fundamental here?

Upvotes: 3

Views: 2546

Answers (1)

Lawliet
Lawliet

Reputation: 3499

As pointed out by @MartinR. Also, according to Apple docs, "enumeration cases can specify associated values of any type to be stored along with each different case value". If you want to keep using enum, you may need to do something like:

static func PrintFruit(fruit:FruitTuple.Apple)
{
    let shape:String = fruit.shape
    let colour:String = fruit.colour

    print("Fruit is \(shape) and \(colour)")
}

I'm not certain of what you want, but I guess using typealias could help achieve your goal.

typealias FruitTuple = (shape: String, colour: String)

enum Fruit
{
    static let apple = FruitTuple("round" , "red")
    static let orange = FruitTuple("round", "orange")
    static let banana = FruitTuple("long", "yellow")
}

func printFruit(fruitTuple: FruitTuple)
{
    let shape:String = fruitTuple.shape
    let colour:String = fruitTuple.colour
}

Upvotes: 5

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