SwiftUI : binding value from function

Question

I would like to binding value from a function. But I have the following error :

Cannot convert value of type 'Int' to expected argument type 'Binding<Int>'

Example code :

struct MyFirstView: View {

  var body: some View {
    MySecondView(index: getIndex())
  }
  
  func getIndex() -> Int {
    /* Code to get the index.... */
        
    return index
  }
}

struct MySecondView: View {
  
  @Binding var index: Int

  var body: some View {
    Text("Current index : ", index)
  }
}

Thanks.

Why a Binding? If the value is not being modified in MySecondView just use a standard property let index: Int — vadian
– vadian, Commented Mar 18, 2022 at 16:32

Asperi · Accepted Answer · 2022-03-18 16:34:37Z

14

You just need to generate binding on-the-fly in function (if you really need binding there), like

  func getIndex() -> Binding<Int> {
    /* Code to get the index.... */

    return Binding(get: {index}, set: {index = $0})
//    return Binding(get: {index}, set: {_ in }) // alternate 
  }

answered Mar 18, 2022 at 16:34

Asperi

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