How to access Picker View results from other File?

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ContentView can’t see CalculsIL because that function doesn’t exist in File. What does exist is a class called Program that has a method called CalculsIL.

Do this:

  1. add Program to your ContentView as an @StateObject so you can access it:
@StateObject var program = Program()
  1. modify Program.CalculsIL to this:
func CalculsIL(indexD: Int, indexV: Int, indexI: Int) -> Double {
    //get ListD, ListV and ListI from your global variables
    let listD = Diaphs
    let listV = Vitesses
    let listI = ISOs
    //and perform your calculations
}

or, if you want to be able to pass in alternate arrays for the ListD, ListV, and ListI parameters, you could use this:

func CalculsIL(listD: [String] = Diaphs, indexD: Int,
               listV: [String] = Vitesses, indexV: Int,
               listI: [String] = ISOs, indexI: Int) -> Double {
    //perform your calculations
}
  1. access the CalculsIL function like this:
Text("IL :\(program.CalculsIL(indexD: indexView1, indexV: indexView2, indexI: indexView3))")

That will make your current code work, although I would probably recommend rethinking how you have everything set up. Using global variables like Diaphs, Vitesses and ISOs isn’t exactly a best practice. I would think about making them properties of your Program class instead.