I created a TabView with 4 items but with iOS 13.x only the first view is displayed correctly.
When I click on another item's icon, the view is not shown correctly but the app only shows a white view. If I run the app on iOS > 14 I can correctly view all the views.
TabView implementation:
struct ContentView: View {
private enum Tab: Hashable {
case discovery
case qrcode
case devices
case settings
}
#State private var selectedTab: Tab = .discovery
var body: some View {
NavigationView {
TabView(selection: $selectedTab) {
DiscoveryView()
.tabItem {
VStack {
Image(systemName: "lock.rotation.open")
Text("Discovery")
}
}
.tag(0)
QrCodeView()
.tabItem {
VStack {
Image(systemName: "qrcode.viewfinder")
Text("QrCode")
}
}
.tag(1)
DevicesView()
.tabItem {
VStack {
Image(systemName: "qrcode.viewfinder")
Text("My devices")
}
}
.tag(2)
SettingsView()
.tabItem {
VStack {
Image(systemName: "gear")
Text("Settings")
}
}
.tag(3)
}
}
}
Implementation of one of the views:
struct QrCodeView: View {
var body: some View {
Text("QrCode")
}
}
Where am I doing wrong?
It might be a reason of selection... selection and tag types should be the same, so try
#State private var selectedTab: Tab = .discovery
var body: some View {
NavigationView {
TabView(selection: $selectedTab) {
DiscoveryView()
.tabItem {
VStack {
Image(systemName: "lock.rotation.open")
Text("Discovery")
}
}
.tag(.discovery) // << here !!
QrCodeView()
.tabItem {
VStack {
Image(systemName: "qrcode.viewfinder")
Text("QrCode")
}
}
.tag(.qrcode) // << here !!
// ... others the same
I have implemented tab bar in my code. I have see all button in my first tab and from that button i want to switch to second tab programmatically. When I use navigationView then it creates another tab bar and moves to that screen and this changes the index of navigation in swiftui.
struct AppTabNavigation: View {
#State var selection: Tab = .dashboard
var body: some View {
TabView(selection: $selection) {
NavigationView {
FirstTabView()
}.navigationBarHidden(true)
.navigationBarBackButtonHidden(true)
.navigationViewStyle(StackNavigationViewStyle())
.tabItem {
Label("Home", systemImage: "house.fill")
.accessibility(label: Text("Home"))
}
.tag(Tab.home)
NavigationView {
SecondView()
}.navigationBarHidden(true)
.navigationBarBackButtonHidden(true)
.navigationViewStyle(StackNavigationViewStyle())
.tabItem {
Label("Home", systemImage: "house.fill")
.accessibility(label: Text("Home"))
}
.tag(second)
}
}
}
Navigation Code:
NavigationLink(destination: AppTabNavigation(selection: Tab.home), isActive: self.$isActiveTabbar){
Text("")
} .isDetailLink(false)
Here is a demo of possible approach - the idea is to move binding for tab selection into view with buttons, so button action could change it.
Tested with Xcode 12 / iOS 14
enum Tab {
case dashboard
case home
case second
}
struct AppTabNavigation: View {
#State var selection: Tab = .home
var body: some View {
TabView(selection: $selection) {
NavigationView {
FirstTabView(tab: $selection)
}.navigationBarHidden(true)
.navigationBarBackButtonHidden(true)
.navigationViewStyle(StackNavigationViewStyle())
.tabItem {
Label("Home", systemImage: "house.fill")
.accessibility(label: Text("Home"))
}
.tag(Tab.home)
NavigationView {
Text("SecondView")
}.navigationBarHidden(true)
.navigationBarBackButtonHidden(true)
.navigationViewStyle(StackNavigationViewStyle())
.tabItem {
Label("Home", systemImage: "house.fill")
.accessibility(label: Text("Home"))
}
.tag(Tab.second)
}
}
}
struct FirstTabView: View {
#Binding var tab: Tab
var body: some View {
Button("Go Second") { self.tab = .second }
}
}
I've just added TabView, which is working fine, but I unable to fetch the selected tab index out if it.
I think I've kept my code perfectly fine, not sure what's wrong.
struct DefaultTabbar: View {
#State private var selectedItem = 1
var body: some View {
TabView(selection: $selectedItem) {
FirstView()
.tabItem{
Image(systemName: "house")
Text("First Tab")
}
.tag(1)
SecondView()
.tabItem{
Image(systemName: "photo")
Text("Second Tab")
}
.tag(2)
}
.accentColor(.orange)
.onTapGesture {
print("selected tab: \(self.selectedItem)")
}
}
}
I'm receiving only 0 while switching tabs.
selected tab: 0.
selected tab: 0.
I think you have the right idea, but don't use onTapGesture, instead use OnChange():
struct DefaultTabbar: View {
#State private var selectedItem = 1
var body: some View {
TabView(selection: $selectedItem) {
FirstView()
.tabItem{
Image(systemName: "house")
Text("First Tab")
}
.tag(1)
SecondView()
.tabItem{
Image(systemName: "photo")
Text("Second Tab")
}
.tag(2)
}
.accentColor(.orange)
.onChange(of: selectedItem) { value in print("selected tab = \(value)") }
}
}
You can use onAppear method for each tab. It's looks ugly but it's works.
struct DefaultTabbar: View {
var lastSelectedTab = 0 {
didSet {
}
}
#State private var selectedItem = 1
var body: some View {
TabView(selection: $selectedItem) {
FirstView()
.onAppear(perform: {
lastSelectedTab = 0
})
.tabItem{
Image(systemName: "house")
Text("First Tab")
}
.tag(1)
SecondView()
.onAppear(perform: {
lastSelectedTab = 1
})
.tabItem{
Image(systemName: "photo")
Text("Second Tab")
}
.tag(2)
}
.accentColor(.orange)
}
}
I'm trying to create a TabView that contains a NavigationView. However, the navigation bar does not reach the top of the screen. How can I fix this?
import SwiftUI
struct ContentView: View {
var body: some View {
TabView {
NavigationView {
TestView()
}
.tabItem {
Image(systemName: "star")
Text("Tab 1")
}
Text("Tab 2")
.tabItem {
Image(systemName: "star")
Text("Tab 2")
}
Text("Tab 3")
.tabItem {
Image(systemName: "star")
Text("Tab 3")
}
}
}
}
struct TestView: View {
var body: some View {
List {
Text("Hello")
}
.navigationBarTitle("Title")
}
}
The following view modifier will help you
.edgesIgnoringSafeArea(.top)
struct ContentView : View {
var body: some View {
NavigationView {
TabbedView {
PasswordGenerator()
.tabItemLabel {
Image("KeyGlyph")
Text("Generator")
}
PasswordGeneratorSettings()
.tabItemLabel {
Image("SettingsGlyph")
Text("Settings")
}
}
}
}
}
This won't compile but it was used in the Swift Essentials video at WWDC (See minute 54:30) and I've seen some workarounds like the VStack workaround (but even that has many flaws, the left tab is too far to the left and the right tab is too far to the right and when switching tabs only the first one that initially loaded loads and the other tab stays blank and using tags doesn't help). So how do I have two tabs that load the views and have an Image and Text?
With XCode beta 3 the following should work:
import SwiftUI
struct Home : View {
#State private var currentTab = 1
var body: some View {
TabbedView(selection: $currentTab) {
FirstView()
.tabItem {
VStack {
Image(systemName: "1.circle")
Text("First Tab")
}
}.tag(1)
SecondView()
.tabItem {
VStack {
Image(systemName: "2.circle")
Text("Second Tab")
}
}.tag(2)
}
}
}
Enclosing the tab label in a VStack seems to be optional, though. So, you might decide to drop this, like:
import SwiftUI
struct Home : View {
#State private var currentTab = 1
var body: some View {
TabbedView(selection: $currentTab) {
FirstView()
.tabItem {
Image(systemName: "1.circle")
Text("First Tab")
}.tag(1)
SecondView()
.tabItem {
Image(systemName: "2.circle")
Text("Second Tab")
}.tag(2)
}
}
}
For those still searching for how to do this, here's an update with Xcode 11 GM.
struct Tabs: View {
#State private var selected = 0
var body: some View {
TabView(selection: $selected) {
MyFirstView()
.tabItem {
Image(systemName: (selected == 0 ? "star.fill" : "star"))
Text("One")
}.tag(0)
MySecondView()
.tabItem {
Image(systemName: (selected == 1 ? "star.fill" : "star"))
Text("Two")
}.tag(1)
MyThirdView()
.tabItem {
Image(systemName: (selected == 2 ? "star.fill" : "star"))
Text("Three")
}.tag(2)
}
.edgesIgnoringSafeArea(.all) // Important if you want NavigationViews to go under the status bar...
}
}
TabbedView() has been deprecated use TabView() instead.
Using integers to select views smells bad to me, from my days working with tag() of UIButton and UIView, it is better to enumerate what you are doing rather than assign a hard coded values that have a very large range. i.e. Int.min() to Int.max(). This also makes code easier to read and maintain in the future.
TabView(selection: ) can be used to select the index, and is declared as:
public struct TabView<SelectionValue, Content> : View where SelectionValue : Hashable, Content : View {
public init(selection: Binding<SelectionValue>?, #ViewBuilder content: () -> Content)
…
This means that you can select the index with any hashable content.
We can use a enum that conforms to Hashable to contain a list of tabs,
In this way can use an Observable later to help control and load state of the view. Or have the enum as part of the state of your app. I am sure there are plenty of resources you can use to find an appropriate solution that meets your needs.
struct MainTabView: View {
#State private var selection: Tabs = .profile
private enum Tabs: Hashable {
case content
case profile
}
var body: some View {
TabView(selection: $selection) {
// Learn Content
Text("The First Tab")
.tabItem {
Image(systemName: "book")
Text("Learn")
}.tag(Tabs.content)
// The Users Profile View.
ProfileView()
.tabItem {
Image(systemName: "person.circle")
Text("Profile")
}.tag(Tabs.profile)
}
}
}
Your code should work, however this is a known issue, from iOS & iPadOS 13 Beta 2 Release Notes:
The tabItemLabel(_:) modifier doesn’t accept #ViewBuilder closures.
The only workaround, until this is fixed, is to use VStack as you've mentioned.
MyView()
.tabItemLabel(VStack {
Image("resourceName")
Text("Item")
})
Update:
This issue was fixed with Xcode 11 beta 3:
The tabItemLabel(:) modifier — now named tabItem(:) — now accepts
#ViewBuilder closures.
Example:
.tabItem {
Image(systemName: "circle")
Text("Tab1")
}
TabbedView was deprecated.
You could use TabView instead now
struct AppTabbedView: View {
#State private var selection = 3
var body: some View {
TabView (selection:$selection){
Text("The First Tab")
.tabItem {
Image(systemName: "1.square.fill")
Text("First")
}
.tag(1)
Text("Another Tab")
.tabItem {
Image(systemName: "2.square.fill")
Text("Second")
}.tag(2)
Text("The Last Tab")
.tabItem {
Image(systemName: "3.square.fill")
Text("Third")
}.tag(3)
}
.font(.headline)
}
}
as of Xcode 11 GM, this code works: (from https://developer.apple.com/documentation/swiftui/tabview)
TabView {
Text("The First Tab")
.tabItem {
Image(systemName: "1.square.fill")
Text("First")
}
Text("Another Tab")
.tabItem {
Image(systemName: "2.square.fill")
Text("Second")
}
Text("The Last Tab")
.tabItem {
Image(systemName: "3.square.fill")
Text("Third")
}
}
.font(.headline)
TabbedView is deprecated and has been renamed to TabView
You can use TabView like this
TabView {
(Text("Tab 1!").tabItem {
Text("First")
})
(Text("Tab 2!").tabItem {
Text("Second")
})
}
The 'TabbedView' can be used in a way similar to the following:
struct TabView : View {
#State private var selection = 1
var body: some View {
TabbedView (selection: $selection) {
InboxList()
.tabItemLabel(selection == 1 ? Image("second") : Image("first"))
.tag(1)
PostsList()
.tabItemLabel(Image("first"))
.tag(2)
Something()
.tabItemLabel(Image("first"))
.tag(3)
}
}
}
I'm not sure why your example doesn't compile but you miss both the selection param and the .tag property on each "tab".
Btw in the current XCode version (beta 2) you cannot show both a text and an image as label.