Cannot convert value of type 'Array[String]' to expected argument type 'Set<String>'

Question

In Swift, I have a function that I am passing an array to, and then using that array in another function. I keep getting this error:

Cannot convert value of type 'Array[String]' to expected argument type 'Set<String>'

@objc func getProductInfo(productIDs: Array<String>) -> Void {
    print(productIDs) //this works with correct data

    SwiftyStoreKit.retrieveProductsInfo(productIDs) { result in

    ...

The rest works, and is tested when I pass in a regular array of ["Monthly", "Yearly", "etc..."].

What does the declaration of SwiftyStoreKit.retrieveProductsInfo() look like? — Remy Lebeau
– Remy Lebeau, Commented Sep 17, 2016 at 1:03
@RemyLebeau its a function that accepts an array of product ids. When I have the array ["Monthly","Yearly"] hard typed in it works no problem. Trying to make it dynamic passing an array through my app. — Dan
– Dan, Commented Sep 17, 2016 at 1:05
that is not what I asked. What is the actual declaration of retrieveProductsInfo()? Clearly it expects something other than what you are giving it, or else you wouldn't be getting the error. — Remy Lebeau
– Remy Lebeau, Commented Sep 17, 2016 at 1:06
@LeoDabus You are the best. I can accept you answer if you'd like to "answer the question". Mind explaining why Set was the right answer? Ty! — Dan
– Dan, Commented Sep 17, 2016 at 1:15

Jeffery Thomas · Accepted Answer · 2016-09-17 01:36:27Z

2

["Monthly", "Yearly", "etc..."] is not an array, it's an array literal. Set can be implicitly initialized with an array literal.

let ayeSet: Set<String> = ["a"] // Compiles

But, it cannot be implicitly initialized with an array.

let bees: Array<String> = ["b"]
let beeSet: Set<String> = bees // Causes Compiler Error

However, if you explicitly initialize it, then it will work.

let sees: Array<String> = ["c"]
let seeSet: Set<String> = Set(sees) // Compiles

So, in your example explicitly initialization should work.

@objc func getProductInfo(productIDs: Array<String>) -> Void {
    print(productIDs) //this works with correct data

    SwiftyStoreKit.retrieveProductsInfo(Set(productIDs)) { result in

    ...

answered Sep 17, 2016 at 1:36

Jeffery Thomas

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Vyacheslav · Accepted Answer · 2017-04-15 18:04:25Z

2

I've face the issue using the same lib. This should work SwiftyStoreKit.retrieveProductsInfo(Set(productIDs))

answered Apr 15, 2017 at 18:04

Vyacheslav

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Leo Dabus · Accepted Answer · 2016-09-17 02:08:51Z

1

You just need to change you method parameter type. SwiftyStoreKit method is expecting a String Set. Your method declaration should be:

func getProductInfo(productIDs: Set<String>)

answered Sep 17, 2016 at 2:08

Leo Dabus

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