Confirm from model in SwiftUI - swiftui

Question

let us imagine that I have something like the following core/model:
class Core: ObservableObject {
...
func action(confirm: () -> Bool) {
if state == .needsConfirmation, !confirm() {
return
}
changeState()
}
...
}
and then I use this core object in a SwiftUI view.
struct ListView: View {
...
var body: some View {
List(objects) {
Text($0)
.onTapGesture {
core.action {
// present an alert to the user and return if the user confirms or not
}
}
}
}
}
So boiling it down, I wonder how to work with handlers there need an input from the user, and I cant wrap my head around it.

Answer 1

It looks like you reversed interactivity concept, instead you need something like below (scratchy)
struct ListView: View {
#State private var confirmAlert = false
...
var body: some View {
List(objects) {
Text($0)
.onTapGesture {
if core.needsConfirmation {
self.confirmAlert = true
} else {
self.core.action() // << direct action
}
}
}
.alert(isPresented: $confirmAlert) {
Alert(title: Text("Title"), message: Text("Message"),
primaryButton: .default(Text("Confirm")) {
self.core.needsConfirmation = false
self.core.action() // <<< confirmed action
},
secondaryButton: .cancel())
}
}
}
class Core: ObservableObject {
var needsConfirmation = true
...
func action() {
// just act
}
...
}
Alternate: with hidden condition checking in Core
struct ListView: View {
#ObservedObject core: Core
...
var body: some View {
List(objects) {
Text($0)
.onTapGesture {
self.core.action() // << direct action
}
}
.alert(isPresented: $core.needsConfirmation) {
Alert(title: Text("Title"), message: Text("Message"),
primaryButton: .default(Text("Confirm")) {
self.core.action(state: .confirmed) // <<< confirmed action
},
secondaryButton: .cancel())
}
}
}
class Core: ObservableObject {
#Published var needsConfirmation = false
...
func action(state: State = .check) {
if state == .check && self.state != .confirmed {
self.needsConfirmation = true
return;
}
self.state = state
// just act
}
...
}