SwiftUI - Picker - enums

Question

I am learning swift, now I have inserted 2 pickers that call the struct Animal.
What I can't understand is how to tell swift that if the first picker has selected an enum value, that same value must not be present in the enum available to the second picker, precisely because it has already been chosen.
Thanks so much :)
import SwiftUI
enum Animal: String, CaseIterable {
case selectCase = "Select"
case bear = "Bear"
case cat = "Cat"
case dog = "Dog"
case lion = "Lion"
case tiger = "Tiger"
static var animals: [String] = [selectCase.rawValue, bear.rawValue, cat.rawValue, dog.rawValue, lion.rawValue, tiger.rawValue]
}
struct ContentView: View {
#State private var Picker1: String = Animal.animals[0]
#State private var Picker2: String = Animal.animals[0]
var body: some View {
NavigationView {
Form {
Section(header: Text("Animals")
.foregroundColor(.black)
.font(.system(size: 15))
.fontWeight(.bold)) {
Picker(selection: $Picker1, label: Text("Select first animal")) {
ForEach(Animal.animals, id: \.self) { element in
Text(element)
}
}
Picker(selection: $Picker2, label: Text("Select second animal")) {
ForEach(Animal.animals, id: \.self) { element2 in
Text(element2)
}
}
}.font(.system(size: 15))
}.navigationBarTitle("List", displayMode: .inline)
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}

Answer 1

Use filter to filter out the selected element from the first Picker unless the selected case is selectCase. Also made a few improvements for you.
Since the enum already conforms to CaseIterable protocol you don't have to create a custom animals array.
Also, you can use capitalized on rawValue instead of providing rawValue for each enum case which feels redundant.
Properties names should start with a lowercase letter and naming them Picker1 cases confusion, naming the selected animal as firstAnimal or selectedFirstAnimal would be more convenient in the future.
Here's the code.
enum Animal: String, CaseIterable {
case select
case bear
case cat
case dog
case lion
case tiger
}
struct ContentView: View {
#State private var firstAnimal = Animal.allCases[0]
#State private var secondAnimal = Animal.allCases[0]
var body: some View {
NavigationView {
Form {
Section(header: Text("Animals")
.foregroundColor(.black)
.font(.system(size: 15))
.fontWeight(.bold)) {
Picker(selection: $firstAnimal, label: Text("Select first animal")) {
ForEach(Animal.allCases, id: \.self) { element in
Text(element.rawValue.capitalized)
}
}
Picker(selection: $secondAnimal, label: Text("Select second animal")) {
ForEach(Animal.allCases.filter { $0 != firstAnimal || firstAnimal == .select }, id: \.self) { element2 in
Text(element2.rawValue.capitalized)
}
}
}.font(.system(size: 15))
}.navigationBarTitle("List", displayMode: .inline)
}
}
}