I have the following SwiftUI code:
struct ContentView: View {
var body: some View {
NavigationView {
Form {
Section {
NavigationLink {
DetailsView()
} label: {
Text("Show details")
}
}
}
Text("Select details")
}
}
}
struct DetailsView: View {
#State var showModal = false
var body: some View {
ZStack {
Color.gray.ignoresSafeArea()
VStack {
Spacer()
Button {
showModal.toggle()
} label: {
Text("Show modal")
.foregroundColor(.black)
.font(.system(size: 20, weight: .bold))
}
}
}
.fullScreenCover(isPresented: $showModal) {
MyModalView {
showModal = false
}
}
}
}
struct MyModalView: View {
var someAction:()->()
var body: some View {
ZStack {
Color.black.ignoresSafeArea()
Button {
someAction()
} label: {
Text("some action")
.foregroundColor(.white)
}
}
}
}
I am experiencing the following bug, where tapping on "Show details" won't show the DetailsView anymore after rotation...
How can I fix this?
Navigation view is really problematical but will be improved with IOS 16. Here is my solution
struct ContentView: View {
#State var navigate = false
var body: some View {
NavigationView {
Form {
Section {
NavigationLink(destination: DetailsView(navigate: $navigate), isActive: $navigate){
Text("Show details")
}
}
}
Text("Select details")
}
.navigationViewStyle(.automatic)
}
}
struct DetailsView: View {
#Binding var navigate: Bool
#State var showModal = false
var body: some View {
ZStack {
Color.gray.ignoresSafeArea()
VStack {
Spacer()
Button {
showModal.toggle()
} label: {
Text("Show modal")
.foregroundColor(.black)
.font(.system(size: 20, weight: .bold))
}
}
}
.fullScreenCover(isPresented: $showModal) {
MyModalView {
showModal = false
}
}
.onAppear(){
navigate = false
}
}}
struct MyModalView: View {
var someAction:()->()
var body: some View {
ZStack {
Color.black.ignoresSafeArea()
Button {
someAction()
} label: {
Text("some action")
.foregroundColor(.white)
}
}
}}
Related
I am trying to push from login view to detail view but not able to make it.even navigation bar is not showing in login view. How to push on button click in SwiftUI? How to use NavigationLink on button click?
var body: some View {
NavigationView {
VStack(alignment: .leading) {
Text("Let's get you signed in.")
.bold()
.font(.system(size: 40))
.multilineTextAlignment(.leading)
.frame(width: 300, height: 100, alignment: .topLeading)
.padding(Edge.Set.bottom, 50)
Text("Email address:")
.font(.headline)
TextField("Email", text: $email)
.frame(height:44)
.accentColor(Color.white)
.background(Color(UIColor.darkGray))
.cornerRadius(4.0)
Text("Password:")
.font(.headline)
SecureField("Password", text: $password)
.frame(height:44)
.accentColor(Color.white)
.background(Color(UIColor.darkGray))
.cornerRadius(4.0)
Button(action: {
print("login tapped")
}) {
HStack {
Spacer()
Text("Login").foregroundColor(Color.white).bold()
Spacer()
}
}
.accentColor(Color.black)
.padding()
.background(Color(UIColor.darkGray))
.cornerRadius(4.0)
.padding(Edge.Set.vertical, 20)
}
.padding(.horizontal,30)
}
.navigationBarTitle(Text("Login"))
}
To fix your issue you need to bind and manage tag with NavigationLink, So create one state inside you view as follow, just add above body.
#State var selection: Int? = nil
Then update your button code as follow to add NavigationLink
NavigationLink(destination: Text("Test"), tag: 1, selection: $selection) {
Button(action: {
print("login tapped")
self.selection = 1
}) {
HStack {
Spacer()
Text("Login").foregroundColor(Color.white).bold()
Spacer()
}
}
.accentColor(Color.black)
.padding()
.background(Color(UIColor.darkGray))
.cornerRadius(4.0)
.padding(Edge.Set.vertical, 20)
}
Meaning is, when selection and NavigationLink tag value will match then navigation will be occurs.
I hope this will help you.
iOS 16+
Note: Below is a simplified example of how to present a new view. For a more advanced generic example please see this answer.
In iOS 16 we can access the NavigationStack and NavigationPath.
Usage #1
A new view is activated by a simple NavigationLink:
struct ContentView: View {
var body: some View {
NavigationStack {
NavigationLink(value: "NewView") {
Text("Show NewView")
}
.navigationDestination(for: String.self) { view in
if view == "NewView" {
Text("This is NewView")
}
}
}
}
}
Usage #2
A new view is activated by a standard Button:
struct ContentView: View {
#State private var path = NavigationPath()
var body: some View {
NavigationStack(path: $path) {
Button {
path.append("NewView")
} label: {
Text("Show NewView")
}
.navigationDestination(for: String.self) { view in
if view == "NewView" {
Text("This is NewView")
}
}
}
}
}
Usage #3
A new view is activated programmatically:
struct ContentView: View {
#State private var path = NavigationPath()
var body: some View {
NavigationStack(path: $path) {
Text("Content View")
.navigationDestination(for: String.self) { view in
if view == "NewView" {
Text("This is NewView")
}
}
}
.onAppear {
path.append("NewView")
}
}
}
iOS 13+
The accepted answer uses NavigationLink(destination:tag:selection:) which is correct.
However, for a simple view with just one NavigationLink you can use a simpler variant: NavigationLink(destination:isActive:)
Usage #1
NavigationLink is activated by a standard Button:
struct ContentView: View {
#State var isLinkActive = false
var body: some View {
NavigationView {
VStack(alignment: .leading) {
...
NavigationLink(destination: Text("OtherView"), isActive: $isLinkActive) {
Button(action: {
self.isLinkActive = true
}) {
Text("Login")
}
}
}
.navigationBarTitle(Text("Login"))
}
}
}
Usage #2
NavigationLink is hidden and activated by a standard Button:
struct ContentView: View {
#State var isLinkActive = false
var body: some View {
NavigationView {
VStack(alignment: .leading) {
...
Button(action: {
self.isLinkActive = true
}) {
Text("Login")
}
}
.navigationBarTitle(Text("Login"))
.background(
NavigationLink(destination: Text("OtherView"), isActive: $isLinkActive) {
EmptyView()
}
.hidden()
)
}
}
}
Usage #3
NavigationLink is hidden and activated programmatically:
struct ContentView: View {
#State var isLinkActive = false
var body: some View {
NavigationView {
VStack(alignment: .leading) {
...
}
.navigationBarTitle(Text("Login"))
.background(
NavigationLink(destination: Text("OtherView"), isActive: $isLinkActive) {
EmptyView()
}
.hidden()
)
}
.onAppear {
self.isLinkActive = true
}
}
}
Here is a GitHub repository with different SwiftUI extensions that makes navigation easier.
Another approach:
SceneDelegate
if let windowScene = scene as? UIWindowScene {
let window = UIWindow(windowScene: windowScene)
window.rootViewController = UIHostingController(rootView: BaseView().environmentObject(ViewRouter()))
self.window = window
window.makeKeyAndVisible()
}
BaseView
import SwiftUI
struct BaseView : View {
#EnvironmentObject var viewRouter: ViewRouter
var body: some View {
VStack {
if viewRouter.currentPage == "view1" {
FirstView()
} else if viewRouter.currentPage == "view2" {
SecondView()
.transition(.scale)
}
}
}
}
#if DEBUG
struct MotherView_Previews : PreviewProvider {
static var previews: some View {
BaseView().environmentObject(ViewRouter())
}
}
#endif
ViewRouter
import Foundation
import Combine
import SwiftUI
class ViewRouter: ObservableObject {
let objectWillChange = PassthroughSubject<ViewRouter,Never>()
var currentPage: String = "view1" {
didSet {
withAnimation() {
objectWillChange.send(self)
}
}
}
}
FirstView
import SwiftUI
struct FirstView : View {
#EnvironmentObject var viewRouter: ViewRouter
var body: some View {
VStack {
Button(action: {self.viewRouter.currentPage = "view2"}) {
NextButtonContent()
}
}
}
}
#if DEBUG
struct FirstView_Previews : PreviewProvider {
static var previews: some View {
FirstView().environmentObject(ViewRouter())
}
}
#endif
struct NextButtonContent : View {
var body: some View {
return Text("Next")
.foregroundColor(.white)
.frame(width: 200, height: 50)
.background(Color.blue)
.cornerRadius(15)
.padding(.top, 50)
}
}
SecondView
import SwiftUI
struct SecondView : View {
#EnvironmentObject var viewRouter: ViewRouter
var body: some View {
VStack {
Spacer(minLength: 50.0)
Button(action: {self.viewRouter.currentPage = "view1"}) {
BackButtonContent()
}
}
}
}
#if DEBUG
struct SecondView_Previews : PreviewProvider {
static var previews: some View {
SecondView().environmentObject(ViewRouter())
}
}
#endif
struct BackButtonContent : View {
var body: some View {
return Text("Back")
.foregroundColor(.white)
.frame(width: 200, height: 50)
.background(Color.blue)
.cornerRadius(15)
.padding(.top, 50)
}
}
Hope this helps!
Simplest and most effective solution is :
NavigationLink(destination:ScoresTableView()) {
Text("Scores")
}.navigationBarHidden(true)
.frame(width: 90, height: 45, alignment: .center)
.foregroundColor(.white)
.background(LinearGradient(gradient: Gradient(colors: [Color.red, Color.blue]), startPoint: .leading, endPoint: .trailing))
.cornerRadius(10)
.contentShape(Rectangle())
.padding(EdgeInsets(top: 16, leading: UIScreen.main.bounds.size.width - 110 , bottom: 16, trailing: 20))
ScoresTableView is the destination view.
In my opinion a cleaner way for iOS 16+ is using a state bool to present the view.
struct ButtonNavigationView: View {
#State private var isShowingSecondView : Bool = false
var body: some View {
NavigationStack {
VStack{
Button(action:{isShowingSecondView = true} ){
Text("Show second view")
}
}.navigationDestination(isPresented: $isShowingSecondView) {
Text("SecondView")
}
}
}
}
I think above answers are nice, but simpler way should be:
NavigationLink {
TargetView()
} label: {
Text("Click to go")
}
I want to close the half sheet and back to the root view In swiftUI when with navigationLink we go to the another view. dismiss() doesn't work and turn us back to the previous view not the root view.
struct ContentView: View {
#State var showFirstSheetView = false
var body: some View {
NavigationView {
VStack {
Text("half sheet")
.onTapGesture {
showFirstSheetView.toggle()
}
}
.navigationTitle("Root view")
.sheet(isPresented: $showFirstSheetView) {
halfSheet()
}
}
}
}
struct halfSheet : View {
#State var showSecondView = false
var body: some View {
NavigationView {
VStack {
}
.background(
NavigationLink(isActive: $showSecondView, destination: {
SecondView()
}, label: {
EmptyView()
})
)
.navigationTitle("First view")
.navigationBarTitleDisplayMode(.inline)
.navigationBarItems( trailing: Button(action: {
showSecondView.toggle()
}) {
Text("Next")
}
)
}
}
}
struct SecondView : View {
#Environment(\.dismiss) var dismiss
var body: some View {
VStack {
}
.navigationTitle("Second view")
.navigationBarTitleDisplayMode(.inline)
.navigationBarBackButtonHidden(true)
.navigationBarItems(leading: Button(action: {
dismiss()
}) {
HStack(spacing : 5) {
Image(systemName: "chevron.backward")
Text("Back")
}
}, trailing: Button(action: {
// How back to the root View?
// below code works but not compatible with ios 15 and gives a warning
// UIApplication.shared.windows.first?.rootViewController?.dismiss(animated: true)
}) {
Text("Done")
})
}
}
With regards to iOS 15, Xcode 13; I am wondering if this is a bug, not properly implemented, or a planned non-functional feature...
With a list that has a .swipeActions that calls a .confirmationDialog the confirmation dialog does not show.
See example:
import SwiftUI
struct ContentView: View {
#State private var confirmDelete = false
var body: some View {
NavigationView {
List{
ForEach(1..<10) {_ in
Cell()
}
.swipeActions(edge: .trailing) {
Button(role: .destructive) {
confirmDelete.toggle()
} label: {
Label("Delete", systemImage: "trash")
}
.confirmationDialog("Remove this?", isPresented: $confirmDelete) {
Button(role: .destructive) {
print("Removed!")
} label: {
Text("Yes, Remove this")
}
}
}
}
}
}
}
struct Cell: View {
var body: some View {
Text("Hello")
.padding()
}
}
Misconfiguration:
The view modifier .confirmationDialog needs to be added to the view that is outside of the .swipeActions view modifier. It works when configured properly as shown below:
import SwiftUI
struct ContentView: View {
#State private var confirmDelete = false
var body: some View {
NavigationView {
List{
ForEach(1..<10) {_ in
Cell()
}
.swipeActions(edge: .trailing) {
Button(role: .destructive) {
confirmDelete.toggle()
} label: {
Label("Delete", systemImage: "trash")
}
}
//move outside the scope of the .swipeActions view modifier:
.confirmationDialog("Remove this?", isPresented: $confirmDelete) {
Button(role: .destructive) {
print("Removed!")
} label: {
Text("Yes, Remove this")
}
}
}
}
}
}
struct Cell: View {
var body: some View {
Text("Hello")
.padding()
}
}
This is annoying. The Edit button in the NavigationBar pushes the View twice. I made a test button which behaves correctly doing the same thing:
import SwiftUI
struct DetailListPage: View {
#Environment(\.presentationMode) var presentationMode
var listName: ListNames
// #State private var isEditDetailListPageShowing = false
#State private var selection: String? = nil
var body: some View {
Form {
Section(header: Text(listName.title ?? "")
.font(.title)
.padding()) {
Text(listName.listDetail ?? "Nothing is set yet!")
.multilineTextAlignment(.leading)
.padding()
.cornerRadius(12)
}
NavigationLink(destination: EditDetailListPage(listName: listName)) {
Button {
} label: {
Text("Edit Page")
}
}
}
.navigationBarBackButtonHidden(true)
.toolbar {
ToolbarItem(placement: .navigationBarTrailing) {
Button {
self.presentationMode.wrappedValue.dismiss()
} label: {
Text("Cancel")
} .padding()
//Edit List Detail
}
ToolbarItem(placement: .navigationBarTrailing) {
NavigationLink(
destination: EditDetailListPage(listName: listName)) {
Text("Edit")
}
}
}
}
The Text("Edit") right above is pushing the view twice.
The Button above it acts correctly. Would like to use the navigationbaritem instead of the button.
Works well for me, on macos 11.4, xcode 12.5, target ios 14.5 and macCatalyst 11.3.
Probably some other code (or settings/system) that is causing the issue.
What system are you using? Show us the missing code and how you call the views. Let us know if the test code below does not work for you.
This is the test code I used:
#main
struct TestErrorApp: App {
var body: some Scene {
WindowGroup {
ContentView()
}
}
}
struct EditDetailListPage: View {
var listName: [String]
var body: some View {
Text("EditDetailListPage")
}
}
struct ContentView: View {
var body: some View {
NavigationView {
DetailListPage(listName: ["test var"])
}.navigationViewStyle(StackNavigationViewStyle())
}
}
struct DetailListPage: View {
#Environment(\.presentationMode) var presentationMode
var listName: [String]
// #State private var isEditDetailListPageShowing = false
#State private var selection: String? = nil
var body: some View {
Form {
Section(header: Text("header string")
.font(.title)
.padding()) {
Text("Nothing is set yet!")
.multilineTextAlignment(.leading)
.padding()
.cornerRadius(12)
}
NavigationLink(destination: EditDetailListPage(listName: listName)) {
Button {
} label: {
Text("Edit Page")
}
}
}
.navigationBarBackButtonHidden(true)
.toolbar {
ToolbarItem(placement: .navigationBarTrailing) {
Button {
self.presentationMode.wrappedValue.dismiss()
} label: {
Text("Cancel")
} .padding()
//Edit List Detail
}
ToolbarItem(placement: .navigationBarTrailing) {
NavigationLink(
destination: EditDetailListPage(listName: listName)) {
Text("Edit")
}
}
}
}
}
struct ListFrontPage: View {
#Environment(\.presentationMode) var presentationMode
#Environment(\.managedObjectContext) var managedObjectContext
#State private var isAddNewListShowing = false
var listNames: FetchRequest<ListNames>
init() {
listNames = FetchRequest<ListNames>(entity: ListNames.entity(), sortDescriptors: [NSSortDescriptor(keyPath: \ListNames.sort, ascending: true)], animation: .default)
}
var body: some View {
VStack {
List() {
Text("Accounts")
.frame(maxWidth: .infinity)
.font(.system(size: 30, weight: .heavy, design: .default))
ForEach (listNames.wrappedValue) { listName in
NavigationLink(destination: DetailListPage(listName: listName)) {
Text("\(listName.title ?? "")")
}
}
.onDelete(perform: deleteItems)
.onMove(perform: moveItem)
}
Spacer()
ZStack {
NavigationLink(destination: AddNewList()) {
Image(systemName: "plus.circle.fill").font(.system(size: 64))
}
}
}
.navigationBarBackButtonHidden(true)
.navigationBarItems(leading: Button {
self.presentationMode.wrappedValue.dismiss()
} label: {
Image(systemName: "chevron.backward")
Label("Back", image: "")
}, trailing: EditButton())
.navigationBarTitle(Text("Account Management"))
}
private func deleteItems(offsets: IndexSet) {
withAnimation {
offsets.map { listNames.wrappedValue[$0] }.forEach(CoreDataHelper.sharedManager.deleteItems)
}
}
private func moveItem(from offsets: IndexSet, to destination: Int)
{
print("From: \(String(describing: offsets)) To: \(destination)")
// Make an array of items from fetched results
var revisedItems: [ ListNames ] = listNames.wrappedValue.map{ $0 }
// change the order of the items in the array
revisedItems.move(fromOffsets: offsets, toOffset: destination )
// update the userOrder attribute in revisedItems to
// persist the new order. This is done in reverse order
// to minimize changes to the indices.
for reverseIndex in stride( from: revisedItems.count - 1,
through: 0,
by: -1 )
{
revisedItems[ reverseIndex ].sort =
Int16( reverseIndex )
}
}
}
I am trying to send alert based on a condition, but the Navigation link is executing regardless of the condition. I was hoping for an intercept.
Goal:
If condition is not me then do not launch new view
New View is launching and then alert.
I am sure my code is incorrect, but I am unsure how I should achieve this
Thanks in advance.
var body: some View {
NavigationView {
VStack {
Button(action: {}) {
//NavigationLink(destination: secondView()) {
NavigationLink(destination: checkState()) {
Text("Add to Cart")
}.padding()
.font(.system(size: 14))
.background(Color.red)
.foregroundColor(.white)
.cornerRadius(6)
}
}
}.padding()
} // End of the GetOrder Struct
struct GetdOrderView_Previews: PreviewProvider {
static var previews: some View {
GetdOrderView()
}
}
}
struct checkState: View {
#ObservedObject var calcCheck = MealOrder()
#State var showingAlert = false
#State var myToggle = false
var body: some View {
NavigationView {
VStack {
Button(action: {
//Enter Action here
if self.myToggle == true {
self.showingAlert = true
} else {
self.showingAlert = true
}
}) {
Text("This is a test")
}.padding()
.font(.system(size: 14))
.background(Color.blue)
.foregroundColor(.white)
.cornerRadius(6)
//Insert Alerts
.alert(isPresented: $showingAlert) {
if self.myToggle {
return Alert(title: Text("Showing Message"), message: Text("Cart is valid"), dismissButton: .default(Text("OK")))
} else {
return Alert(title: Text("Showing Alert"), message: Text("Cart Empty"), dismissButton: .default(Text("Cancel")))
}
}
}
}
}
}
struct secondView: View {
var body: some View {
VStack {
Text("This is the second test")
}
}
}
Try the following approach
#State var activateLink = false
var body: some View {
NavigationView {
VStack {
NavigationLink(destination: checkState(), isActive: $activateLink) {
EmptyView()
}
Button(action: {
if _YOUR_CONDITION_HERE_ {
self.activateLink = true
}
}) {
Text("Add to Cart")
.padding()
.font(.system(size: 14))
.background(Color.red)
.foregroundColor(.white)
.cornerRadius(6)
}
}
.onAppear { self.activateLink = false }
}.padding()
}// End of the GetOrder Struct