DateDurationPicker.swift

struct DateDurationPicker: UIViewRepresentable {
  let selection: Binding<DateDuration>
  let values: [Int]
  let units: [DateDuration.Unit]
    
  func makeUIView(context: Context) -> UIPickerView {
    let pickerView = UIPickerView(frame: .zero)
    pickerView.translatesAutoresizingMaskIntoConstraints = false
    pickerView.delegate = context.coordinator
    pickerView.dataSource = context.coordinator
    return pickerView
  }
  // …
}