SwiftUI onReceive is it possible to get oldValue? - swiftui

Question

I have a custom TabView and I want to Bind to a State to change tabs. I also want to detect if the user has tapped the same tab again in order to scroll to the top of that view.
didSet isn't called when I use a binding. onChange isn't called because the value hasn't changed, and onReceive doesn't give me the old value to compare.
Any ideas? (Trying to avoid using a published property)
struct ContentView: View {
#State private var scrollToTop1: Bool = false
#State private var scrollToTop2: Bool = false
#State private var selectedTab: Int = 1
var body: some View {
ZStack(alignment: .bottom) {
TabView(selection: $selectedTab) {
NavigationView {
View1(scrollToTop: $scrollToTop1)
}
.tag(1)
NavigationView {
View2(scrollToTop: $scrollToTop2)
}
.tag(2)
}
.onReceive(Just(selectedTab)) { [oldValue = selectedTab] newValue in
print("Old: \(oldValue)") //Shows newValue
print("New: \(newValue)")
if oldValue == newValue {
switch selectedTab {
case 1:
scrollToTop1.toggle()
case 2:
scrollToTop2.toggle()
default:
break
}
}
}
TabBar(selectedTab: $selectedTab)
}
}
}
struct TabBar: View {
#Binding var selectedTab: Int
var body: some View {
HStack {
TabItem(selectedTab: $selectedTab, text: "View 1", tab: 1)
TabItem(selectedTab: $selectedTab, text: "View 2", tab: 2)
}
.background(Color.green)
}
}
struct TabItem: View {
#Binding var selectedTab: Int
let text: String
let tab: Int
var body: some View {
Button {
selectedTab = tab
} label: {
Text(text)
}
.frame(maxWidth: .infinity)
.frame(height: 50)
}
}

Answer 1

I think this is a great scenario for a custom Binding, where you can intercept the value before its set and compare it:
struct ContentView: View {
#State private var scrollToTop1: Bool = false
#State private var scrollToTop2: Bool = false
#State private var selectedTab: Int = 1
var customBinding: Binding<Int> {
.init {
selectedTab
} set: { newValue in
print("New value: ", newValue)
if newValue == selectedTab {
print("Scroll to top")
}
selectedTab = newValue
}
}
var body: some View {
ZStack(alignment: .bottom) {
TabView(selection: customBinding) {
NavigationView {
Text("1")
}
.tag(1)
NavigationView {
Text("2")
}
.tag(2)
}
TabBar(selectedTab: customBinding)
}
}
}
struct TabBar: View {
#Binding var selectedTab: Int
var body: some View {
HStack {
TabItem(selectedTab: $selectedTab, text: "View 1", tab: 1)
TabItem(selectedTab: $selectedTab, text: "View 2", tab: 2)
}
.background(Color.green)
}
}