SwiftUI - Picker .onChange and didSet - sorting

Question

I'm trying to achieve the behavior in the attached GIF:
Sorry for the High Speed, I had to compress it dramatically to be able to upload it here. The App is "Documents" from Readdle if you want to have a look on your own.
Anyways: I'm exactly trying to achieve this behavior (sorting and filtering, including the dynamic arrow up down icon).
I tried the following approach, however I'm not able to achieve this "ontap" expierience. On Change only triggers when I change the value but when I want to sort an existing value ascending and descending it's not working (which is obvious because it's not changing). I already played around with "didSet" but this also did not work.
Do you have an idea how this can be accomplished?
Below is my code:
import SwiftUI
struct ContentView: View {
#State var selection = 0
#State var sortByAsc = true
#State var filterColumn = "A"
//Test to set case via picker but picter doesnt execute didSet
#State var myFilterTest: MyFilters = .alphabetical {
didSet {
switch myFilterTest {
case .creationDate:
sortByAsc.toggle()
print("c")
case .rating:
sortByAsc.toggle()
print("b")
case .alphabetical:
sortByAsc.toggle()
print("a")
}
}
}
var body: some View {
NavigationView {
Text("Hello, World!")
.padding()
.navigationTitle("SwiftUI")
.toolbar {
ToolbarItem(placement: .navigationBarTrailing) {
Menu(content: {
Picker("My Picker", selection: $selection) {
Label("Title", systemImage: sortByAsc ? "arrow.down" : "arrow.up")
.tag(0)
Label("Rating", systemImage: sortByAsc ? "arrow.down" : "arrow.up")
.tag(1)
.onTapGesture {
print("tap")
}
}
.onChange(of: selection) { tag in
print("Selected Tag: \(tag)")
sortByAsc.toggle()
if(tag == 0) {
filterColumn = "Title"
}
if(tag == 1) {
filterColumn = "Rating"
}
}
}, label: {
Image(systemName: "ellipsis.circle")
})
}
}
}
}
}
enum MyFilters: CaseIterable {
case alphabetical
case rating
case creationDate
}

Answer 1

Solved It. Here's the Code:
struct PickerView: View {
#State private var pickerIndex = 0
#State private var previousPickerIndex = 0
#State var sortByAsc = true
var body: some View {
let pickerSelection = Binding<Int>(get: {
return self.pickerIndex
}, set: {
self.pickerIndex = $0
if(pickerIndex == previousPickerIndex) {
sortByAsc.toggle()
}
previousPickerIndex = pickerIndex
})
NavigationView {
Text("Hello, World!")
.padding()
.navigationTitle("SwiftUI")
.toolbar {
ToolbarItem(placement: .navigationBarTrailing) {
Menu(content: {
Picker("My Picker", selection: pickerSelection) {
ForEach(0..<4, id: \.self) { index in
Label("Title \(index)", systemImage: getSortingImage(menuItem: index))
.tag(index)
}
}
}, label: {
Image(systemName: "ellipsis.circle")
})
}
}
}
}
func getSortingImage(menuItem: Int) -> String {
if(menuItem == pickerIndex) {
if(sortByAsc) {
return "arrow.down"}
else {
return "arrow.up"
}
}
else {
return ""
}
}
}