SwiftUI Picker onChange or equivalent?

Question

I want to change some other unrelated @State variable when a Picker gets changed but there is no onChanged and it\'s not possible to p

Answer 1

For people that have to support both iOS 13 and 14, I added an extension which works for both. Don't forget to import Combine.

Extension View {
    @ViewBuilder func onChangeBackwardsCompatible(of value: T, perform completion: @escaping (T) -> Void) -> some View {
        if #available(iOS 14.0, *) {
            self.onChange(of: value, perform: completion)
        } else {
            self.onReceive([value].publisher.first()) { (value) in
                completion(value)
            }
        }
    }
}

Usage:

Picker(selection: $selectedIndex, label: Text("Color")) {
    Text("Red").tag(0)
    Text("Blue").tag(1)
}.onChangeBackwardsCompatible(of: selectedIndex) { (newIndex) in
    print("Do something with \(newIndex)")
}