SwiftUI: How do you dismiss a sheet and launch a different sheet from ContentView? - ios

Question

For my app, I have a welcome screen that intro's what the app does and allows the user to create their first item. When the user clicks the button I'd like to dismiss the 'welcomeScreen' sheet and and then launch the 'newRemindr' sheet.
I tried to achieve this by creating an observable object with an 'addNewTrigger' boolean set to false. When I click the Add New Reminder button on the welcomeScreen, the button's action causes the welcomeScreen to dismiss and toggles the 'addNewTrigger' boolean to True. (I've verified this is working with Print Statements). However content view is listening to that same observed object to launch the 'newRemindr' sheet but that action doesn't seem to be working.
Can somebody please take a look at the code and see where I am going wrong? Or suggest an alternative that can provide the type of functionality.
I really appreciate all the help. Thanks!
Code Below...
welcomeScreen:
import SwiftUI
import Combine
struct welcomeScreen: View {
#Environment(\.presentationMode) var mode: Binding<PresentationMode>
#ObservedObject var addNewReminder = showAddScreen()
var body: some View {
NavigationView {
ZStack (alignment: .center) {
LinearGradient(gradient: Gradient(colors: [Color.white, Color.white, Color.gray]), startPoint: .top, endPoint: .bottom)
.edgesIgnoringSafeArea(.all)
Image("Ellipse2")
.offset(y: -475)
VStack {
Spacer()
Text("Welcome to")
.foregroundColor(.white)
.fontWeight(.bold)
Image("RemindrLogoWhite")
Spacer()
Text("What is remindr?")
.font(.title)
.fontWeight(.bold)
.padding(.bottom, 25)
Text("Remindr is a simple app designed to help you schedule random reminders with the goal of clearing your mind.\n\nRemind yourself to check in with your body, set up positive affirmations, set your intentions; Whatever it is, the power is up to you.")
.padding(.horizontal, 25)
.padding(.bottom, 25)
Text("Click below to get started:")
.fontWeight(.bold)
// Add New Reminder Button
Button(action: {
self.mode.wrappedValue.dismiss()
print("Add Reminder Button from Welcome Screen is Tapped")
self.addNewReminder.addNewTrigger.toggle()
print("var addNewTrigger has been changed to \(self.addNewReminder.addNewTrigger)")
}) {
Image("addButton")
.renderingMode(.original)
}.padding(.bottom, 25)
Spacer()
} .frame(maxWidth: UIScreen.main.bounds.width,
maxHeight: UIScreen.main.bounds.height)
}
.navigationBarTitle(Text(""), displayMode: .automatic)
.navigationBarItems(trailing: Button(action: {
self.mode.wrappedValue.dismiss()
}, label: {
Image(systemName: "xmark")
.foregroundColor(.white)
}))
}
}
}
ContentView:
import SwiftUI
import CoreData
class showAddScreen: ObservableObject {
#Published var addNewTrigger = false
}
struct ContentView: View {
#Environment(\.managedObjectContext) var moc
#FetchRequest(entity: ReminderEntity.entity(), sortDescriptors: [NSSortDescriptor(keyPath: \ReminderEntity.dateCreated, ascending: false)])
var reminder: FetchedResults<ReminderEntity>
// Sheet Control
#ObservedObject var addNewReminder = showAddScreen()
//#State private var showingAddScreen = false
#State var showWelcomeScreen = false
let emojiList = EmojiList()
//Toggle Control
#State var notifyOn = true
// Save Items Function
func saveItems() {
do {
try moc.save()
} catch {
print(error)
}
}
// Delete Item Function
func deleteItem(indexSet: IndexSet) {
let source = indexSet.first!
let listItem = reminder[source]
moc.delete(listItem)
}
// View Controller
var body: some View {
VStack {
NavigationView {
ZStack (alignment: .top) {
// List View
List {
ForEach(reminder, id: \.self) { notification in
NavigationLink(destination: editRemindr(reminder: notification,
notifyOn: notification.notifyOn,
emojiChoice: Int(notification.emojiChoice),
notification: notification.notification ?? "unknown",
notes: notification.notes ?? "unknown")) {
// Text within List View
HStack {
// MARK: TODO
//Toggle("NotifyOn", isOn: self.$notifyOn)
// .labelsHidden() // Hides the label/title
Text("\(self.emojiList.emojis[Int(notification.emojiChoice)]) \(notification.notification!)")
}
}
}
.onDelete(perform: deleteItem)
}.lineLimit(1)
// Navigation Items
.navigationBarTitle("", displayMode: .inline)
.navigationBarItems(
leading:
HStack {
Button(action: {
self.showWelcomeScreen.toggle()
}) {
Image(systemName: "info.circle.fill")
.font(.system(size: 24, weight: .regular))
}.foregroundColor(.gray)
// Positioning Remindr Logo on Navigation
Image("remindrLogoSmall")
.resizable()
.aspectRatio(contentMode: .fit)
//.frame(width: 60, height: 60, alignment: .center)
.padding(.leading, 83)
.padding(.top, -10)
},
// Global Settings Navigation Item
trailing: NavigationLink(destination: globalSettings()){
Image("settings")
.font(Font.title.weight(.ultraLight))
}.foregroundColor(.gray)
)
// Add New Reminder Button
VStack {
Spacer()
Button(action: { self.addNewReminder.addNewTrigger.toggle()
}) {
Image("addButton")
.renderingMode(.original)
}
.sheet(isPresented: $addNewReminder.addNewTrigger) {
newRemindr().environment(\.managedObjectContext, self.moc)
}
}
}
} .sheet(isPresented: $showWelcomeScreen) {
welcomeScreen()
}
}
}
}

Answer 1

First what I see is you use different observable objects in both views, but should use same, so changes made in one view be available for second view as well.
Se here is a way to solve this
struct welcomeScreen: View {
#Environment(\.presentationMode) var mode: Binding<PresentationMode>
#ObservedObject var addNewReminder: showAddScreen // << declare to be injected
// ... other code
and in ContentView
} .sheet(isPresented: $showWelcomeScreen) {
welcomeScreen(addNewReminder: self.addNewReminder) // << inject !!
}
Alternate: you can remove addNewReminder from welcomeScreen and work with it only in ContentView by activating on welcome sheet dismiss, like
} .sheet(isPresented: $showWelcomeScreen, onDismiss: {
// it is better to show second sheet with delay to give chance
// for first one to animate closing to the end
DispatchQueue.main.asyncAfter(deadline: .now() + 0.5) {
self.addNewReminder.addNewTrigger.toggle()
}
}
) {
welcomeScreen()
}