I'm using Navigation View inside TabView and the problem is that if I an on Tab A and with NavigationView I open other Views, when changing from tab A to B and after a while I came back to tab A I dosen't reload tab A from beginning but it show the last View open with NavitagionLink. The problem is that in each View I'm getting data from a DB and because of that if shows an empty view.
My ContentView looks like this:
struct ContentView: View {
#ObservedObject var appState = AppState()
#State var currentTab : Tab
var body: some View {
TabView(selection: $appState.currentTab) {
NavigationView {
HomeView(appState: appState)
}
.tabItem {
if appState.currentTab == .home {
Image(systemName: "house.fill")
} else {
Image(systemName: "house")
}
Text(LocalizedStringKey("HomeTabMenu"))
}.tag(Tab.home)
NavigationView {
SearchView()
}
.tabItem {
if appState.currentTab == .search {
Image(systemName: "magnifyingglass.circle.fill")
} else {
Image(systemName: "magnifyingglass")
}
Text(LocalizedStringKey("SearchTabMenu"))
}.tag(Tab.search)
NavigationView {
AddItemView(appState: appState)
}
.tabItem {
if appState.currentTab == .add {
Image(systemName: "plus.circle.fill")
} else {
Image(systemName: "plus.circle")
}
Text(LocalizedStringKey("SellTabMenu"))
}.tag(Tab.add)
NavigationView {
ShoppingCartFavoritesView()
}
.tabItem {
if appState.currentTab == .favorites {
Image(systemName: "cart.fill")
} else {
Image(systemName: "cart")
}
Text(LocalizedStringKey("CartTabMenu"))
}.tag(Tab.favorites)
NavigationView {
ProfileView(appState: appState)
}
.tabItem {
if appState.currentTab == .profile {
Image(systemName: "person.fill")
} else {
Image(systemName: "person")
}
Text(LocalizedStringKey("ProfileTabMenu"))
}.tag(Tab.profile)
}//End TabView
.accentColor(Color("ColorMainDark"))
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView(currentTab: Tab.home)
}
}
class AppState: ObservableObject {
#Published var currentTab : Tab = .home
}
enum Tab {
case home, search, add, favorites, profile
}
And if I open SearchView()
struct SearchView: View {
var body: some View {
NavigationLink(destination: View_2(id: "ABC")){
Text("ABC")
}
}
}
struct View_2: View {
#ObservedObject var performSearchProducts = PerformSearchInProducts()
var id : String
var body: some View {
ScollView {
ForEach(performSearchProducts.products) { product in
Text(product.name)
}
}.onAppear(perform: {
self.performSearchProducts.searchSubCategory(id: id)
})
}
}
If in SearchView I'm on View_2() and the I open another Tab, when I come back to tab SearchView it doesn't show the SearchView(), but it remains on View_2() with the back button in navigation bar.
How can I make to show SearchView() and not keep the state of NavigationLink?
It's the default behavior. Attach id to TabView.
}//End TabView
.accentColor(Color("ColorMainDark"))
.id(appState.currentTab) //<--Here
Related
I have a question about the new NavigationStack in IOS 16. I have a problem setting navigationTitle in ContentView, I set navigationTitle but it is the same for all tabs. Can I set it somehow so that I can edit it for each different tab? Using tag ? thank you very much
struct ContentView: View {
#State var selection = 1
var body: some View {
NavigationStack {
TabView(selection: $selection) {
LaunchView()
.badge(2)
.tabItem {
Label("Received", systemImage: "tray.and.arrow.down.fill")
}
.tag(1)
DeView()
.tabItem {
Label("Sent", systemImage: "tray.and.arrow.up.fill")
}
.tag(2)
DeView()
.tabItem {
Label("Sent", systemImage: "tray.and.arrow.up.fill")
}
.tag(3)
}
.navigationTitle("test")
}
}
}
You can create a function that returns the title for every selection:
func title() -> String {
if selection == 1 {
return title
}else if selection == 2 {
return some Title
}else if selection == 3 {
return some other Title
}
}
Or my personal best way: Enums!
Create an enum that holds the tabs, then create a title property for each tab:
struct ContentView: View {
#State var selection = Tab.received
var body: some View {
NavigationStack {
TabView(selection: $selection) {
Text("hello")
.badge(2)
.tabItem {
Label("Received", systemImage: "tray.and.arrow.down.fill")
}
.tag(Tab.received)
Text("hello3")
.tabItem {
Label("Sent", systemImage: "tray.and.arrow.up.fill")
}
.tag(Tab.sent)
Text("hello5")
.tabItem {
Label("Sent", systemImage: "tray.and.arrow.up.fill")
}
.tag(Tab.sennt)
}.navigationTitle(selection.title)
}
}
}
enum Tab: Int {
case received = 1
case sent = 2
case sennt = 3
var title: String {
switch self {
case .received:
return "Hello"
case .sent:
return "Hello World"
case .sennt:
return "Hello, World!"
}
}
}
Plus it’s easier to work with than Ints.
Edit: To hide the TabBar for DeviceView:
struct Test: View {
#State var selection = 1
#State var devicePresented = false
var body: some View {
NavigationStack {
//Content
.navigationDestination(isPresented: $devicePresented) {//present DeviceView when devicePresented is true
DeviceView()
}
}
}
}
struct SettingsView: View {
#Binding var devicePresented: Bool
var body: some View {
List {
Button(action: {
devicePresented.toggle()
}) {
Text("Go to device")
}
}
}
}
I have the following code
enum Tab {
case accounts, lootbox
}
struct ContentView: View {
#State private var currentTab:Tab = .lootbox
var body: some View {
TabView(selection: $currentTab){
AccountView()
.tabItem {
Label("Accounts", systemImage: "person.crop.circle")
}
.tag(Tab.accounts)
Lootbox()
.tabItem {
Label("Lootbox", systemImage: "shippingbox")
}
.tag(Tab.lootbox)
}
.tabViewStyle(.page)
}
}
struct AccountView: View {
var body: some View {
NavigationView{
VStack{
Text("AccountView")
Spacer()
.navigationTitle("Lootbox")
}
}
.navigationViewStyle(.stack)
}
}
struct Lootbox: View {
var body: some View {
NavigationView{
VStack{
Text("Lootbox")
Spacer()
}
.navigationTitle("Lootbox")
}
.navigationViewStyle(.stack)
}
}
The VStackhides behind the navigation view title. After swiping right and left, it is as expected. Why is that? Or is this a bug of SwiftUI?
Before swipe left and right:
After (how it should be):
I am using TabView in swiftui. I want navigate child view from tabview tabItem. When I navigate from taview to childview, it shows tabview in bottom. Here is the image.. that click login goes to Myview page. But in Myview, Tabview is not hiding
Here is my code..
Tabview
struct WelcomeView: View {
var body: some View {
TabView {
HomeView()
.tabItem {
Image("home_icon")
Text("Home")
}
.tag(0)
NotificationView()
.tabItem {
Image("notification_icon")
Text("Notification")
}.tag(1)
AccountView()
.tabItem {
Image("account_icon")
Text("Account")
}.tag(2)
SettingView()
.tabItem {
Image("settings_icon")
Text("Setting")
}.tag(3)
}
}
}
In SettingView tabItem:
struct SettingView: View {
#State private var isActive = false
var body: some View {
NavigationView {
VStack(alignment: .leading) {
VStack {
Button(action: {
isActive = true
}) {
Text("Login")
}
NavigationLink("", destination: MyView(), isActive: $isActive)
}
}
}
}
}
MyView:
struct MyView: View {
var body: some View {
ZStack{
Text("Hello My View")
}.navigationBarHidden(true)
.navigationBarTitleDisplayMode(.inline)
}
}
When I click login Button in SettingView tabItem, It goes to MyView page. But in MyView page tabview is not hide.
How to hide tabview from MyView page?
To hide the tab we can add a Bool that will take care of showing the view or not. Then by using #Binding we can pass it to the other child views, whatever changes you make down the chain will affect all the views.
struct WelcomeView: View {
#State var isTabViewShown = true
var body: some View {
TabView {
if isTabViewShown {
HomeView()
.tabItem {
Image(systemName: "house.fill")
Text("Home")
}
.tag(0)
NotificationView()
.tabItem {
Image(systemName: "envelope.open.fill")
Text("Notification")
}.tag(1)
AccountView()
.tabItem {
Image(systemName: "person.crop.circle")
Text("Account")
}.tag(2)
SettingView(isTabViewShown: $isTabViewShown)
.tabItem {
Image(systemName: "gearshape")
Text("Setting")
}.tag(3)
}
}
}
}
struct MyView: View {
#Binding var isTabViewShown: Bool
var body: some View {
ZStack{
Text("Hello My View")
}
.navigationBarHidden(false)
.navigationBarTitleDisplayMode(.inline)
.onAppear {
isTabViewShown = false
}
}
}
struct SettingView: View {
#State private var isActive = false
#Binding var isTabViewShown: Bool
var body: some View {
NavigationView {
VStack(alignment: .leading) {
VStack {
Button(action: {
isActive = true
}) {
Text("Login")
}
NavigationLink("", destination: MyView(isTabViewShown: $isTabViewShown), isActive: $isActive)
//Here is a button if you want to show it again
Button(action: {
isTabViewShown.toggle()
//You can also use this is you don't want to use a toggle
// isTabViewShown = true
}) {
Text("Show again")
}
}
}
}
}
}
struct HomeView: View {
var body: some View {
Text("Home View")
}
}
struct NotificationView: View {
var body: some View {
Text("Notification View")
}
}
struct AccountView: View {
var body: some View {
Text("Account View")
}
}
I need do some refresh on some view after networking request completion, but my tab bar auto switched to first tabview after refreshing the page, here is my code:
//tab view
struct PricesView: View {
#ObservedObject var netWorkManager = NetworkManager.shareInstance
var body: some View {
if netWorkManager.dataList.isEmpty {
LoadingView().onAppear(perform: netWorkManager.fetchPricesData)
} else {
Text("Prices").foregroundColor(.red)
}
}
}
...
//main view
struct ContentView: View {
var body: some View {
TabView {
HomeView().tabItem {
Image(systemName: "house.fill")
Text("home")
}
AlertsView().tabItem {
Image(systemName: "flag.fill")
Text("alerts")
}
LinksView().tabItem {
Image(systemName: "link.icloud")
Text("link")
}
PricesView().tabItem {
Image(systemName: "bitcoinsign.circle")
Text("prices")
}
}
}
}
how can I avoid this?
Use selection and tag.
struct ContentView: View {
#State var selection = 0 // <- Here declare selection
var body: some View {
TabView(selection: $selection) { // <- Use selection here
HomeView().tabItem {
Image(systemName: "house.fill")
Text("home")
}.tag(0) // <- Add tag
AlertsView().tabItem {
Image(systemName: "flag.fill")
Text("alerts")
}.tag(1) // <- Add tag
LinksView().tabItem {
Image(systemName: "link.icloud")
Text("link")
}.tag(2) // <- Add tag
PricesView().tabItem {
Image(systemName: "bitcoinsign.circle")
Text("prices")
}.tag(3) // <- Add tag
}
}
}
I have the fllowing TabViews in the ContentView. For the onAppear, it works fine. However, I am trying also to reload the tabs and move to the home after the user login from LoginView.
Following is the code of the ContentView
// ContentView.swift
// Matjri
//
//
import SwiftUI
struct ContentView: View {
#ObservedObject var user = User()
var body: some View {
HStack{
if (user.tokenIsActive) {
TabView {
HomeView()
.tabItem {
VStack {
Image(systemName: "house")
Text("Home")
}
}.tag(0)
UserPostsView()
.tabItem {
VStack {
Image(systemName: "person.fill")
Text("Me")
}
}.tag(1)
NewPostView()
.tabItem {
VStack {
Image(systemName: "plus")
Text("Add")
}
}.tag(2)
SearchView()
.tabItem {
VStack{
Image(systemName: "magnifyingglass")
Text("Search")
}
}.tag(3)
}
} else {
TabView {
HomeView()
.tabItem {
VStack {
Image(systemName: "house")
Text("Home")
}
}.tag(0)
LoginView()
.tabItem {
VStack {
Image(systemName: "person.fill")
Text("Me")
}
}.tag(1)
SearchView()
.tabItem{
VStack{
Image(systemName: "magnifyingglass")
Text("Search")
}
}.tag(2)
}
}
}
.onAppear() {
self.checkLoginValidity()
}
}
func checkLoginValidity() {
let userLogged = UserDefaults.standard.object(forKey: "userIsLogged") as? Bool ?? false
if (userLogged) {
let existinLogin = UserDefaults.standard.object(forKey: "loginExpiry") as! Date
if (existinLogin > Date().addingTimeInterval(86400 * 2)){
self.user.tokenIsActive = true
} else {
self.user.tokenIsActive = false
}
} else {
self.user.tokenIsActive = false
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
When the user login from the LoginView, I set the tokenIsActive to true
struct LoginView: View {
#ObservedObject var user = User()
........
//Login successful
self.user.tokenIsActive = true
TabView is not updating. How can I achieve this and I move the user to the homeview after login.
It is used different User() instances in ContentView and LoginView. Here is a solution:
struct LoginView: View {
#ObservedObject var user: User // << only declare
and here
LoginView(user: self.user) // << inject own user instance
.tabItem {
VStack {
Image(systemName: "person.fill")
Text("Me")
}
}.tag(1)