How do I implement #EnvironmentObject for this custom full-screen modal setup? - modal-dialog

Question

My goal is to have custom modals present over an root view that is essentially a tabbed view. So, I wrapped the TabView in a ZStack and am using an ObservableOBject. But I don't feel I'm doing it the right way.
In my other file, I have the Custom modal "subviews" which has an enum, too, which I think is the right approach to take. But I cannot figure out how to dismiss a modal after it is visible.
It must be #EnvironmentObject, but I don't know what if anything to put in the scene delegate, etc. ("Hacking with Swift" is failing me here, although it's a great resource.)
My idea is that views from the tabbed view will have various buttons which present different modal views, populated later with data specific to say a user and set of fields for data entry.
Right now, I just want to understand how to present and dismiss them.
Here is my root view
import SwiftUI
struct ContentView: View {
#ObservedObject var modal = CustomModal()
var body: some View {
ZStack {
TabView {
ZStack {
Color.pink.opacity(0.2)
Button(action: {
withAnimation{
self.modal.visibleModal = VisibleModal.circle
}
}) {
Text("Circle").font(.headline)
}
.frame(width: 270, height: 64)
.background(Color.pink.opacity(0.5)).foregroundColor(.white)
.cornerRadius(12)
}
.tabItem{
VStack{
Image(systemName: "1.square.fill")
Text("One")
}
}.tag(1)
ZStack {
Color.blue.opacity(0.2)
Button(action: {
self.modal.visibleModal = VisibleModal.squircle
}) {
Text("Square").font(.headline)
}
.frame(width: 270, height: 64)
.background(Color.blue.opacity(0.5)).foregroundColor(.white)
.cornerRadius(12)
}
.tabItem{
VStack{
Image(systemName: "2.square.fill")
Text("Two")
}
}.tag(2)
}.accentColor(.purple)
VStack {
containedView()
}
}
}
func containedView() -> AnyView {
switch modal.visibleModal {
case .circle: return AnyView(CircleView())
case .squircle: return AnyView(SquircleView())
case .none: return AnyView(Text(""))
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
And here is my second file with the enum and "subview" modals
import SwiftUI
class CustomModal: ObservableObject {
#Published var visibleModal: VisibleModal = VisibleModal.none
}
enum VisibleModal {
case circle, squircle, none
}
struct CircleView: View {
var body: some View {
ZStack {
Color.pink.blur(radius: 0.4)
Circle().fill()
.frame(width: 300)
.foregroundColor(Color.white.opacity(0.75))
dismissButton()
}.edgesIgnoringSafeArea(.all)
}
}
struct SquircleView: View {
var body: some View {
ZStack{
Color.green.blur(radius: 0.4)
RoundedRectangle(cornerRadius: 48, style: .continuous)
.frame(width: 300, height: 300).foregroundColor(Color.white.opacity(0.75))
dismissButton()
}.edgesIgnoringSafeArea(.all)
}
}
struct dismissButton: View {
#ObservedObject var modal = CustomModal()
var body: some View {
VStack{
Spacer()
Button(action: {
self.modal.visibleModal = VisibleModal.none
}) {
Text("Dismiss").font(.headline)
}
.frame(width: 270, height: 64)
.background(Color.white.opacity(0.35)).foregroundColor(.white)
.cornerRadius(12)
.padding(.bottom, 44)
}
}
}

Answer 1

Are you just trying to pass your observable object to the new view?
func containedView() -> some View {
switch modal.visibleModal {
case .circle: return CircleView()
.environmentObject(self.modal)
case .squircle: return SquircleView()
.environmentObject(self.modal)
case .none: return Text("")
}
}
Unless I am misunderstanding the question.

Answer 2

Okay, after a lot of fiddling, it works.
Now my code is as follows.
Root view
struct ContentView: View {
#EnvironmentObject var isModalVisible: CustomModal
#ObservedObject var modal = CustomModal()
var body: some View {
ZStack {
TabView {
ZStack {
Color.pink.opacity(0.2)
Button(action: {
withAnimation{
self.isModalVisible.isModalVisible.toggle()
self.modal.currentModal = VisibleModal.circle
}
}) {
Text("Circle").font(.headline)
}
.frame(width: 270, height: 64)
.background(Color.pink.opacity(0.5)).foregroundColor(.white)
.cornerRadius(12)
}
.tabItem{
VStack{
Image(systemName: "1.square.fill")
Text("One")
}
}.tag(1)
ZStack {
Color.blue.opacity(0.2)
Button(action: {
self.isModalVisible.isModalVisible.toggle()
self.modal.currentModal = VisibleModal.squircle
}) {
Text("Square").font(.headline)
}
.frame(width: 270, height: 64)
.background(Color.blue.opacity(0.5)).foregroundColor(.white)
.cornerRadius(12)
}
.tabItem{
VStack{
Image(systemName: "2.square.fill")
Text("Two")
}
}.tag(2)
}.accentColor(.purple)
if self.isModalVisible.isModalVisible {
VStack {
containedView()
}
}
}
}
func containedView() -> AnyView {
switch modal.currentModal {
case .circle: return AnyView(CircleView())
case .squircle: return AnyView(SquircleView())
case .none: return AnyView(Text(""))
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView().environmentObject(CustomModal())
}
}
and the second file with the supporting views and classes and enums:
import SwiftUI
class CustomModal: ObservableObject {
#Published var isModalVisible = false
#Published var currentModal: VisibleModal = .none
}
enum VisibleModal {
case circle, squircle, none
}
struct CircleView: View {
#EnvironmentObject var env: CustomModal
var body: some View {
ZStack {
Color.pink.blur(radius: 0.4)
Circle().fill()
.frame(width: 300)
.foregroundColor(Color.white.opacity(0.75))
dismissButton()
}.edgesIgnoringSafeArea(.all)
}
}
struct SquircleView: View {
var body: some View {
ZStack{
Color.green.blur(radius: 0.4)
RoundedRectangle(cornerRadius: 48, style: .continuous)
.frame(width: 300, height: 300).foregroundColor(Color.white.opacity(0.75))
dismissButton()
}.edgesIgnoringSafeArea(.all)
}
}
struct dismissButton: View {
#EnvironmentObject var env: CustomModal
var body: some View {
VStack{
Spacer()
Button(action: {
self.env.isModalVisible.toggle()
print("TAPPED")
}) {
Text("Dismiss").font(.headline)
}
.frame(width: 270, height: 64)
.background(Color.white.opacity(0.35)).foregroundColor(.white)
.cornerRadius(12)
.padding(.bottom, 44)
}
}
}
It still can be refactored. I'm sure. I'd also be happy to hear any comments on how to improve it. But it seems to work.
NOTE: This code ContentView().environmentObject(CustomModal()) is put in the previewP{rovider code and in SceneDelegate.