Custom event modifier in SwiftUI - swiftui

Question

I created a custom button, that shows a popover. Here is my code:
PopupPicker
struct PopupPicker: View {
#State var selectedRow: UUID?
#State private var showPopover = false
let elements: [PopupElement]
var body: some View {
Button((selectedRow != nil) ? (elements.first { $0.id == selectedRow! }!.text) : elements[0].text) {
self.showPopover = true
}
.popover(isPresented: self.$showPopover) {
PopupSelectionView(elements: self.elements, selectedRow: self.$selectedRow)
}
}
}
PopupSelectionView
struct PopupSelectionView: View {
var elements: [PopupElement]
#Binding var selectedRow: UUID?
var body: some View {
List {
ForEach(self.elements) { element in
PopupText(element: element, selectedRow: self.$selectedRow)
}
}
}
}
PopupText
struct PopupText: View {
var element: PopupElement
#Binding var selectedRow: UUID?
var body: some View {
Button(element.text) {
self.presentation.wrappedValue.dismiss()
self.selectedRow = self.element.id
}
}
}
That works fine, but can I create a custom event modifier, so that I can write:
PopupPicker(...)
.onSelection { popupElement in
...
}

Answer 1

I can't give you a full solution as I don't have all of your code and thus your methods to get the selected item anyhow, however I do know where to start.
As it turns out, declaring a function with the following syntax:
func `onSelection`'(arg:type) {
...
}
Creates the functionality of a .onSelection like so:
struct PopupPicker: View {
#Binding var selectedRow: PopupElement?
var body: some View {
...
}
func `onSelection`(task: (_ selectedRow: PopupElement) -> Void) -> some View {
print("on")
if self.selectedRow != nil {
task(selectedRow.self as! PopupElement)
return AnyView(self)
}
return AnyView(self)
}
}
You could theoretically use this in a view like so:
struct ContentView: View {
#State var popupEl:PopupElement?
var body: some View {
PopupPicker(selectedRow: $popupEl)
.onSelection { element in
print(element.name)
}
}
}
However I couldn't test it properly, please comment on your findings
Hope this could give you some insight in the workings of this, sorry if I couldn't give a full solution