SwiftUI : Picker does not update correctly when changing datasource

Question

I have just started learning SwiftUI and got stuck somewhere!

I am trying to change segment styled picker datasource when changing value of another segment. But some

Answer 1

Nick Polychronakis solved it in this fork: https://github.com/nickpolychronakis/100DaysOfSwiftUI/tree/master/UnitCoverter

The solution is to add .id(:identifier:) to your picker so it is unique.

Observable var:

@State var unit = 0

Main picker:

Picker("Length", selection: $unit) {
                    ForEach(0 ..< inputUnitTypes.count) {
                        Text("\(self.inputUnitTypes[$0].description)")
                    }
                }
                .pickerStyle(SegmentedPickerStyle())

One of secondary pickers which content is determined by the unit variable.

Picker("Length", selection: $inputUnit) {
                        ForEach(0 ..< selected.count) {
                            Text("\(self.selected[$0].description)")
                        }
                    }
                    .id(unit)