I try to use "sheet" modifier to popup a modal view when a List cell was tapped. I find that it's ok in the List Cell View (Modal View could popup multi-times when cell be clicked), but in List View the modal view popups just once.
I have tried using Gesture and Button to trigger the popup, I find that once I use "sheet" modifier to trigger the Modal View, the Result is all the same.
struct ContentView: View {
var body: some View {
List {
ForEach(0..<5) { _ in
ListRow()
}
}
}
}
struct ListRow: View {
#State var showDetail: Bool = false
var body: some View {
HStack(spacing: 20.0) {
Button(action: {self.showDetail = true}) {
HStack {
Text("BigTitle")
.font(.largeTitle)
.fontWeight(.heavy)
Spacer()
Text("SubTitle")
.font(.headline)
.fontWeight(.medium)
.padding(.trailing, 10)
}
}
.sheet(isPresented: self.$showDetail) {
DetailView()
}
}
.frame(width: 320, height: 48)
.padding()
}
}
struct DetailView: View {
var body: some View {
Text("I am Detail View!")
.font(.largeTitle)
.fontWeight(.heavy)
}
}
I had hoped that the modal view could be popped multiple-times in the List View, but in reality the popup occurred just once.
Hope you reply!
Thank you!
Related
I have a button that opens up a Profile & Settings view in a sheet that has additional navigation views in it.
I am aware how to dismiss the sheet, however this method seems to not work with additional navigation views, as when I'm deeper into the navigation and I tap "Done" to dismiss the sheet, it only returns me back to the previous navigation view until I go back to the main Profile & Settings view.
The view with the button:
import SwiftUI
struct TodayView: View {
#State private var showSheet = false
var body: some View {
NavigationView {
ScrollView {
VStack(alignment: .leading) {
TodayTabDateComponent()
.padding(.top, -10)
ForEach(0 ..< 32) { item in
VStack(alignment: .leading) {
Text("Title")
Text("Description")
}
.padding(.vertical)
}
}
.frame(maxWidth: .infinity, alignment: .leading)
.padding(.horizontal)
}
.navigationTitle("Today")
.toolbar {
ToolbarItem(placement: .navigationBarLeading) {
Button(action: {
showSheet = true
}, label: {
Image(systemName: "person.circle.fill")
.foregroundColor(.primary)
})
.sheet(isPresented: $showSheet) {
ProfileAndSettingsView()
}
}
}
}
}
}
struct TodayView_Previews: PreviewProvider {
static var previews: some View {
TodayView()
}
}
The Profile & Settings view:
import SwiftUI
struct ProfileAndSettingsView: View {
#Environment(\.presentationMode) var presentationMode
var body: some View {
NavigationView {
VStack {
List {
Section {
NavigationLink {
UserProfileView()
} label: {
HStack(alignment: .center) {
Image("avatar")
.resizable()
.aspectRatio(contentMode: .fit)
.clipShape(Circle())
.frame(width: 60, height: 60)
VStack(alignment: .leading) {
Text("Name Surname")
.font(.title2)
.fontWeight(.bold)
Text("Profile Settings, Feed Preferences\n& Linked Accounts")
.font(.caption)
}
}
}
.padding(.vertical, 6)
} }
.listStyle(.insetGrouped)
.navigationTitle("Profile & Settings")
.navigationBarTitleDisplayMode(.inline)
.toolbar {
ToolbarItem(placement: .navigationBarTrailing) {
Button {
presentationMode.wrappedValue.dismiss()
} label: {
Text("Done")
}
}
}
}
}
}
}
struct ProfileAndSettingsView_Previews: PreviewProvider {
static var previews: some View {
ProfileAndSettingsView()
}
}
I have looked into the issue but couldn't find any working solutions.
Is your issue here that you're applying the .sheet to the Button inside the Toolbar? I think you need to apply it to the NavigationView itself?
import SwiftUI
struct TodayView: View {
#State private var showSheet = false
var body: some View {
NavigationView {
....
}
.navigationTitle("Today")
.toolbar {
ToolbarItem(placement: .navigationBarLeading) {
Button(action: {
showSheet = true
}, label: {
Image(systemName: "person.circle.fill")
.foregroundColor(.primary)
})
}
}
.sheet(isPresented: $showSheet) {
ProfileAndSettingsView()
}
}
}
}
If you're targeting iOS15 or higher don't use presentationMode use #Environment(\.isPresented) private var isPresented instead this will perform the action that you want.
presentationMode was deprecated and replaced by isPresented and dismiss
I believe that presentationMode performs a similar action as dismiss does which according to Apple Docs (on the dismiss)
If you do this, the sheet fails to dismiss because the action applies to the environment where you declared it, which is that of the detail view, rather than the sheet. In fact, if you’ve presented the detail view in a NavigationView, the dismissal pops the detail view the navigation stack.
The dismiss action has no effect on a view that isn’t currently presented. If you need to query whether SwiftUI is currently presenting a view, read the isPresented environment value.
If you're targeting a lower iOS version you can create your own key like so
struct SheetOpen: EnvironmentKey {
static var defaultValue: Binding<Bool> = .constant(false)
}
extension EnvironmentValues {
var sheetOpen: Binding<Bool> {
get { self[SheetOpen.self] }
set { self[SheetOpen.self] = newValue }
}
}
Where you have your sheet defined you do this
.sheet(isPresented: $showSheet) {
ProfileAndSettingsView()
.environment(\.sheetOpen, $showSheet)
}
Then you can use it like any other environment variable
#Environment(\.sheetOpen) var sheetOpen
To dismiss it you simply do this sheetOpen.wrappedValue.toggle()
I have my entire application wrapped in a NavigationView and am trying to duplicate the transition in the brief video listed below. Based on what I am seeing, it looks like they present a fullScreenCover, and when a link is pressed it dismisses the fullScreenCover and pushes whatever was tapped onto the navigation stack once the dismiss has completed.
Example video
I currently have this...
#Environment(\.dismiss) var dismiss
ScrollView {
VStack {
ForEach(viewModel.searchResults, id: \.self) { bottle in
NavigationLink(destination: BottleDetailView(bottle: bottle)) {
BottleCell(bottle: bottle) <-- tapping this would dismiss fullscreenCover and push this NavigationLink into the NavigationStack of my app
}
}
}
}
I have tried embedding another navigation view in the fullscreenCover but that was not even close to duplicating the transition above. How can I duplicate this?
You can make use of a programmatically controllable NavigationStack. In the fullscreenCover first dismiss, then wait for it to vanish, then set the navigation destination.
Here is a full example:
struct ContentView: View {
#State private var search = ""
#State private var showSheet = false
// programmatically controllable Navigation Stack
#State private var path = [Int]()
var body: some View {
NavigationStack(path: $path) {
VStack {
searchField
.disabled(true)
.onTapGesture {
showSheet = true
}
Spacer()
Text("Other stuff")
Spacer()
}
.padding()
.navigationTitle("Find something")
.fullScreenCover(isPresented: $showSheet) {
fullscreenSheet
}
// this defines the destination(s) for the programatically activated navigation stack
.navigationDestination(for: Int.self) { value in
Text("Detail View for Result \(value)")
}
}
}
var fullscreenSheet: some View {
VStack(alignment: .leading, spacing: 30) {
HStack {
searchField
Button("Cancel") { showSheet = false }
}
// dummy search results
ForEach(1..<6) { result in
Button("Result \(result) >") {
// dismiss sheet
showSheet = false
// wait and trigger navigation
Task {
try await Task.sleep(for: .seconds(0.1))
self.path = [result]
}
}
}
Spacer()
}
.padding()
}
var searchField: some View {
HStack {
Image(systemName: "magnifyingglass")
.foregroundColor(.white)
TextField("", text: $search,
prompt: Text("What are you looking for?")
.foregroundColor(.white)
)
}
.padding()
.background(
Capsule().fill(.gray)
)
}
}
I want to create a Carousel with SwiftUI(without using TabView)
with a matching/linked Page Control in SwiftUI
So far I have both views and can update the pageControl view with a
#State var pagecontrolTracker updated with a DragGesture() .onChanged but it doesn't update the PageControl if I scroll fast, or sometimes doesn't update at all 😭.
If I Scroll slow tho, the Page Control does update sometimes as expected.
Is there a better way to update this faster and smoother?
I saw .updating modifier for DragGesture() but this doesn't work either
Full View:
struct ContentView: View {
#State var pagecontrolTracker: Int = 0
var body: some View {
VStack {
ScrollView(.horizontal) {
HStack {
ForEach(0...3, id: \.self) { index in
PagingRow()
.gesture(DragGesture().onChanged({ _ in
pagecontrolTracker = index
}))
}
}
}
PagingControls(pagecontrolTracker: $pagecontrolTracker)
}
.padding()
}
}
Inside Custom SwiftUI Row View
struct PagingRow: View {
var body: some View {
VStack {
HStack {
Image(systemName: "globe")
Text("Test Title")
}
.padding()
Button {
print("Test action")
} label: {
Text("Tap Me")
}
.buttonStyle(.borderedProminent)
.padding()
}
.background(Color.orange)
.frame(width: 200)
.cornerRadius(8)
}
}
Custom PageControl in SwiftUI
struct PagingControls: View {
#Binding var pagecontrolTracker: Int
var body: some View {
HStack {
ForEach(0...3, id: \.self) { pagingIndex in
Circle()
.fill(pagecontrolTracker == pagingIndex ? .orange : .black)
.frame(width: 8, height: 8)
}
}
}
}
Note: I don't want to use TabView since I want to be able to show the next upcoming card in the scrollView
A TabView would only show one card per page
I'm using Xcode 12 with deployment for iOS 14.0.
My home screen has a NavigationView
Within the NavigationView there is a TabView (with 4 tabs)
Within each tab are subviews that have buttons and NavigationLinks
The navigation on the app is functioning correctly (when I click a NavigationLink on one of the subviews, it navigates to the correct view and when I click the back button, it dismisses the view.) However, when I click the back button, the console prints the following error:
Trying to pop to a missing destination at /Library/Caches/com.apple.xbs/Sources/Monoceros/Monoceros-103/Shared/NavigationBridge_PhoneTV.swift:337
Aside from the error log, the app is functioning fine, so I'm planning to just ignore the error for now... but I'm wondering what it means? I don't have anything within my code named "Monoceros". I'm guessing it has something to do with the TabView being a subview of the NavigationView?
EDIT:
Several months later, this issue still persists. Here is reproducible code. Open the ContentView(), on the FirstScreen() click on the NavigationLink, then click the back button. It will print out Monoceros lol
import SwiftUI
struct ContentView: View {
var body: some View {
NavigationView {
TabView {
FirstScreen()
.tabItem {
Text("One")
Image(systemName: "house.fill")
}
Text("Second Screen")
.tabItem {
Text("Two")
Image(systemName: "heart.fill")
}
}
}
}
}
struct FirstScreen: View {
var body: some View {
NavigationLink("Click here", destination: Text("Final Screen"))
// Click the back button on FinalScreen prints:
//Trying to pop to a missing destination at /Library/Caches/com.apple.xbs/Sources/Monoceros_Sim/Monoceros-120/Shared/NavigationBridge_PhoneTV.swift:341
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
Unfortunately this is an active issue with a TabView placed inside NavigationView.
The error would not manifest itself if you placed your NavigationView inside the TabView, but this of course would lead to the tabs being displayed from within your Final Screen, which you are probably trying to avoid.
There is currently no work-around for this, and as of to date we need to wait for Apple to properly implement the corresponding .navigationBarHidden() of TabViews as well.
Problems and unexpected behaviours have been reported when embedding a TabView into a NavigationView, however if you have tested your app thoroughly and found no particular problems, it is safe to say that you can stick to this method.
Alternatively you will have to build a TabView component manually, like below:
import SwiftUI
enum Tab {
case house, heart
}
struct TabView: View {
#Binding var tabIdx: Tab
var body: some View {
HStack {
Group {
Spacer()
Button (action: {
self.tabIdx = .house
}) {
VStack{
Image(systemName: "house.fill")
Text("House")
.font(.system(size: 10))
}
}
.foregroundColor(self.tabIdx == .house ? .blue : .secondary)
Spacer()
Button (action: {
self.tabIdx = .heart
}) {
VStack{
Image(systemName: "heart.fill")
Text("Heart")
.font(.system(size: 10))
}
}
.foregroundColor(self.tabIdx == .heart ? .blue : .secondary)
Spacer()
}
}
.padding(.bottom, 30)
.padding(.top, 10)
.background(Color(red: 0.1, green: 0.1, blue: 0.1))
.font(.system(size: 30))
.frame(height: 80)
}
}
struct FirstScreen: View {
var body: some View {
NavigationLink("Click here", destination: Text("Final Screen"))
.font(.system(size:20))
}
}
struct ContentView: View {
#State var tabIdx: Tab = .house
var body: some View {
NavigationView {
VStack(spacing: 20) {
Spacer()
if tabIdx == .house {
FirstScreen()
} else if tabIdx == .heart {
Text("Second Screen")
}
Spacer(minLength: 0)
TabView(tabIdx: self.$tabIdx)
}
.ignoresSafeArea()
}
}
}
The above bug is well detailed in this blog post, which you could consult for further reference and more examples.
I am attempting to dismiss a modal view presented via a .sheet in SwiftUI - called by a Button which is within a NavigationViews navigationBarItems, as per below:
struct ModalView : View {
#Environment(\.presentationMode) var presentationMode
var body: some View {
Button(action: {
self.presentationMode.value.dismiss()
}, label: { Text("Save")})
}
}
struct ContentView : View {
#State var showModal: Bool = false
var body: some View {
NavigationView {
Text("test")
.navigationBarTitle(Text("Navigation Title Text"))
.navigationBarItems(trailing:
Button(action: {
self.showModal = true
}, label: { Text("Add") })
.sheet(isPresented: $showModal, content: { ModalView() })
)
}
}
}
The modal does not dismiss when the Save button is tapped, it just remains on screen. The only way to get rid of it is swiping down on the modal.
Printing the value of self.presentationMode.value always shows false so it seems to think that it hasn't been presented.
This only happens when it is presented from the NavigationView. Take that out and it works fine.
Am I missing something here, or is this a beta issue?
You need to move the .sheet outside the Button.
NavigationView {
Text("test")
.navigationBarTitle(Text("Navigation Title Text"))
.navigationBarItems(trailing:
Button("Add") {
self.showModal = true
}
)
.sheet(isPresented: $showModal, content: { ModalView() })
}
You can even move it outside the NavigationView closure.
NavigationView {
Text("test")
.navigationBarTitle(Text("Navigation Title Text"))
.navigationBarItems(trailing:
Button("Add") { self.showModal = true }
)
}
.sheet(isPresented: $showModal, content: { ModalView() })
Notice you can also simplify the Button call if you have a simple text button.
The solution is not readily apparent in the documentation and most tutorials opt for simple solutions. But I really wanted a button in the NavigationBar of the sheet that would dismiss the sheet. Here is the solution in six steps:
Set the DetailView to not show.
Add a button to set the DetailView to show.
Call the .sheet(isPresented modifier to display the sheet.
Wrap the view that will appear in the sheet in a NavigationView because we want to display a .navigationBarItem button.
PresentationMode is required to dismiss the sheet view.
Add a button to the NavBar and call the dismiss method.
import SwiftUI
struct ContentView: View {
// 1
#State private var showingDetail = false
var body: some View {
VStack {
Text("Hello, world!")
.padding()
Button("Show Detail") {
showingDetail = true // 2
}
// 3
.sheet(isPresented: $showingDetail) {
// 4
NavigationView {
DetailView()
}
}
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
struct DetailView: View {
// 5
#Environment(\.presentationMode) var presentationMode
var body: some View {
Text("Detail View!")
// 6
.navigationBarItems(leading: Button(action: {
presentationMode.wrappedValue.dismiss()
}) {
Image(systemName: "x.circle")
.font(.headline)
.foregroundColor(.accentColor)
})
}
}