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iosarraysswiftvariablesconcatenation
Dave
Dave

Reputation: 12216

Call Array Where Name is Half String and Half Variable: Dynamic References

My end goal is to pass the desired array to a function. The problem is the array name depends on the situation. It may be 1 of 30 names.

I have about 30 arrays all named "default_SomeName". Now the previous VC passes the SomeName value. Based on that value, my goal is to pass one of the 30 arrays to a function. Yet, dynamic references are apparently not easy.

I've tried:

var someName: String! //Passed from presenting VC
let desiredArray = "default_" + someName
myFunction(desiredArray)

But I get:

Cannot convert value of type 'String' to expected argument type [String]

Anyone know how to do this?

Upvotes: 0

Views: 55

Answers (2)

Dave
Dave

Reputation: 12216

Well, since there didn't seem to be an easy way, I decided to go with a sure-fire, clear way!

This switch is as basic as it gets. It takes someName, matches it to a case, and they all run the same function but an array specific to that someName value.

func passArrayToFunc () {
    switch someName {
    case "somename1":
        funcThatNeedsArray(someArray1)
    case "someName2":
        funcThatNeedsArray(someArray2)
    case "someName3":
        funcThatNeedsArray(someArray3)
    case "someName4":
        funcThatNeedsArray(someArray4)
    case "someName5":
        funcThatNeedsArray(someArray5)
    case "someName6":
        funcThatNeedsArray(someArray6)
    case "someName7":
        funcThatNeedsArray(someArray7)
    case "someName8":
        funcThatNeedsArray(someArray8)
    default:
        print("No matches")
    }

Upvotes: 0

Paulw11
Paulw11

Reputation: 115104

You can use a dictionary to associate each dictionary with it's name. Dictionaries are explained in the Apple Swift book, but generally you would do something like this:

var dictionary=[String:[Int]]()

dictionary["default_1234"]=[1,2,3,4]
dictionary["default_5678"]=[5,6,7,8]

let suffix="1234"

print(dictionary["default_\(suffix)"])

In this case I have used an array of Int, but you can have any array type

Upvotes: 2

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