SwiftUI action at deselection of a Lists row - swiftui

Question

I have a SwiftUI List, that changes an attribute on a row, e.g. color on a tap.
Now I want to start an action e.g. reset the color, if another row is tapped.
I´m looking for an event, that the row receives ,if it is deselected.
Here my example code:
struct ContentView: View {
#State var data : [String] = ["first","second","third","4th","5th"]
var body: some View {
List {
ForEach (data, id: \.self) {
item in
ColoredRow(text: item)
}
}
}
}
struct ColoredRow: View {
var text: String = ""
#State var col : Color = Color.white
var body: some View{
Text("\(text)")
.background(col)
.onTapGesture {
self.col = Color.red
}
// .onDeselect {
// print("disappeare \(self.text)")
// self.col = Color.white
// }
}
}

Answer 1

Let' recall that SwiftUI is reactive (ie. state-driven, not event-driven), so if we wan't to change something in UI we need to find a way to change it via state (either UI or model, but state).
So, below is slightly modified your code to show possible approach. Tested with Xcode 11.2 / iOS 13.2.
struct ContentView: View {
#State var data : [String] = ["first","second","third","4th","5th"]
#State private var selectedItem: String? = nil
var body: some View {
List {
ForEach (data, id: \.self) {
item in
ColoredRow(text: item, selection: self.$selectedItem)
}
}
}
}
struct ColoredRow: View {
var text: String = ""
#Binding var selection: String?
#State var col : Color = Color.white
var body: some View{
Text("\(text)")
.background(selection == text ? Color.red : Color.white)
.onTapGesture {
self.selection = (self.selection == self.text ? nil : self.text)
}
}
}