I had tried this code, I have also tried with stacks but not able to align with top .
I just want the view to appear on top with auto layout as like UIKit .
import SwiftUI
struct ItemDetail: View {
let item : MenuItem
var body: some View {
HStack(alignment: .top){
VStack{
Image(item.mainImage)
Text(item.description)
}
.padding(10)
.background(.red)
.navigationTitle(item.name)
}
}
}
struct ItemDetail_Previews: PreviewProvider {
static var previews: some View {
ItemDetail(item: MenuItem.example)
}
}
Swap the HStack for a VStack and add a Spacer() at the end. e.g.:
struct ItemDetail: View {
let item : MenuItem
var body: some View {
VStack{
VStack{
Image(item.mainImage)
Text(item.description)
}
.padding(10)
.background(.red)
.navigationTitle(item.name)
Spacer()
}
}
}
This should do it:
VStack()
{
VStack
{
Image(item.mainImage)
Text(item.description)
}
.padding(10)
.background(.red)
.navigationTitle(item.name)
Spacer()
}
Problem
First time when the button "Go to 990" is tapped the scroll view doesn't scroll to 990 on top. (see screenshot below)
The anchor is not respected.
Second time it scrolls to 990 top correctly.
Questions
What is wrong and how can it be fixed?
Versions
Xcode 14
Code
struct ContentView: View {
#State private var scrollProxy: ScrollViewProxy?
var body: some View {
NavigationStack {
ScrollViewReader { proxy in
List(0..<1000, id: \.self) { index in
VStack(alignment: .leading) {
Text("cell \(index)")
.font(.title)
Text("text 1")
.font(.subheadline)
Text("text 2")
.font(.subheadline)
}
}
.onAppear {
scrollProxy = proxy
}
}
.toolbar {
ToolbarItem {
Button("Go to 990") {
scrollProxy?.scrollTo(990, anchor: .top)
}
}
}
}
#if os(macOS)
.frame(minWidth: 500, minHeight: 300)
#endif
}
}
Screenshot
I have a horizontally scrolling LazyHStack. How do I set the initial scroll position?
In UIKit, I would create a horizontally scrolling UICollectionView and set the collectionView.contentOffset to set the initial scroll position, but I'm not sure how to do this in SwiftUI.
struct ContentView: View {
var body: some View {
ScrollView(.horizontal) {
LazyHStack {
ForEach(1...100, id: \.self) { i in
Text("\(i)")
}
}
}
}
}
You can use ScrollViewReader
Manual scroll
struct ContentView: View {
var body: some View {
ScrollViewReader { value in
Button("Go to #15") {
value.scrollTo(15, anchor: .center)
}
ScrollView(.horizontal) {
LazyHStack(alignment: .top, spacing: 10) {
ForEach(1...100, id: \.self) {
Text("Column \($0)")
}
}
}
}
}
}
Automatic scroll
struct ContentView: View {
var body: some View {
ScrollViewReader { value in
ScrollView(.horizontal) {
LazyHStack(alignment: .top, spacing: 10) {
ForEach(1...100, id: \.self) {
Text("Column \($0)")
}
}
}
.onAppear {
value.scrollTo(15, anchor: .center)
}
}
}
}
I am attempting to implement a PageTabViewStyle inside a NavigationView so that I can swipe between two different lists but the TabView does not ignore the safe area despite having .ignoresSafeArea().
Code
struct TestView: View {
#State private var selectedPage = 0
private var pages = [0, 1]
var body: some View {
NavigationView {
TabView(selection: $selectedPage) {
FirstList()
.ignoresSafeArea()
.tag(0)
SecondList()
.tag(1)
}
.ignoresSafeArea()
.tabViewStyle(PageTabViewStyle(indexDisplayMode: .never))
.navigationBarTitleDisplayMode(.inline)
.toolbar {
ToolbarItem(placement: .principal) {
Picker("", selection: $selectedPage) {
ForEach(pages, id: \.self) {
Text(String($0))
}
}
.scaledToFit()
.pickerStyle(.segmented)
}
}
}
}
}
struct FirstList: View {
var body: some View {
List {
Text("0")
}
}
}
struct SecondList: View {
var body: some View {
List {
Text("1")
}
}
}
Results:
How do I set it such that the list view would fill the navigationBar like the image below:
Note that adding a background color is not preferred as I would like to maintain the navigationBar tint effect when the list view is scrolled.
It is because List has its own background. You can either set listStyle to .plain or manually set the color of List background e.g. onAppear.
struct ContentView: View {
#State private var selectedPage = 0
private var pages = [0, 1]
var body: some View {
NavigationView {
TabView(selection: $selectedPage) {
FirstList()
.ignoresSafeArea()
.tag(0)
SecondList()
.tag(1)
}
.ignoresSafeArea()
.tabViewStyle(PageTabViewStyle(indexDisplayMode: .never))
.navigationBarTitleDisplayMode(.inline)
.onAppear {
// UITableView.appearance().backgroundColor = UIColor(Color.clear) // solution2
}
.toolbar {
ToolbarItem(placement: .principal) {
Picker("", selection: $selectedPage) {
ForEach(pages, id: \.self) {
Text(String($0))
}
}
.scaledToFit()
.pickerStyle(.segmented)
}
}
}
}
}
struct FirstList: View {
var body: some View {
List {
Text("0")
}
.listStyle(.plain) //solution1
}
}
struct SecondList: View {
var body: some View {
List {
Text("1")
}
.listStyle(.plain) //solution1
}
}
I have a TabView and separate NavigationView stacks for every Tab item. It works well but when I open any NavigationLink the TabView bar is still displayed. I'd like it to disappear whenever I click on any NavigationLink.
struct MainView: View {
#State private var tabSelection = 0
var body: some View {
TabView(selection: $tabSelection) {
FirstView()
.tabItem {
Text("1")
}
.tag(0)
SecondView()
.tabItem {
Text("2")
}
.tag(1)
}
}
}
struct FirstView: View {
var body: some View {
NavigationView {
NavigationLink(destination: FirstChildView()) { // How can I open FirstViewChild with the TabView bar hidden?
Text("Go to...")
}
.navigationBarTitle("FirstTitle", displayMode: .inline)
}
}
}
I found a solution to put a TabView inside a NavigationView, so then after I click on a NavigationLink the TabView bar is hidden. But this messes up NavigationBarTitles for Tab items.
struct MainView: View {
#State private var tabSelection = 0
var body: some View {
NavigationView {
TabView(selection: $tabSelection) {
...
}
}
}
}
struct FirstView: View {
var body: some View {
NavigationView {
NavigationLink(destination: FirstChildView()) {
Text("Go to...")
}
.navigationBarTitle("FirstTitle", displayMode: .inline) // This will not work now
}
}
}
With this solution the only way to have different NavigationTabBars per TabView item, is to use nested NavigationViews. Maybe there is a way to implement nested NavigationViews correctly? (As far as I know there should be only one NavigationView in Navigation hierarchy).
How can I hide TabView bar inside NavigationLink views correctly in SwiftUI?
I really enjoyed the solutions posted above, but I don't like the fact that the TabBar is not hiding according to the view transition.
In practice, when you swipe left to navigate back when using tabBar.isHidden, the result is not acceptable.
I decided to give up the native SwiftUI TabView and code my own.
The result is more beautiful in the UI:
Here is the code used to reach this result:
First, define some views:
struct FirstView: View {
var body: some View {
NavigationView {
VStack {
Text("First View")
.font(.headline)
}
.navigationTitle("First title")
.frame(minWidth: 0, maxWidth: .infinity, minHeight: 0, maxHeight: .infinity, alignment: .center)
.background(Color.yellow)
}
}
}
struct SecondView: View {
var body: some View {
VStack {
NavigationLink(destination: ThirdView()) {
Text("Second View, tap to navigate")
.font(.headline)
}
}
.navigationTitle("Second title")
.frame(minWidth: 0, maxWidth: .infinity, minHeight: 0, maxHeight: .infinity, alignment: .center)
.background(Color.orange)
}
}
struct ThirdView: View {
var body: some View {
VStack {
Text("Third View with tabBar hidden")
.font(.headline)
}
.frame(minWidth: 0, maxWidth: .infinity, minHeight: 0, maxHeight: .infinity, alignment: .center)
.background(Color.red.edgesIgnoringSafeArea(.bottom))
}
}
Then, create the TabBarView (which will be the root view used in your app):
struct TabBarView: View {
enum Tab: Int {
case first, second
}
#State private var selectedTab = Tab.first
var body: some View {
VStack(spacing: 0) {
ZStack {
if selectedTab == .first {
FirstView()
}
else if selectedTab == .second {
NavigationView {
VStack(spacing: 0) {
SecondView()
tabBarView
}
}
}
}
.animation(nil)
if selectedTab != .second {
tabBarView
}
}
}
var tabBarView: some View {
VStack(spacing: 0) {
Divider()
HStack(spacing: 20) {
tabBarItem(.first, title: "First", icon: "hare", selectedIcon: "hare.fill")
tabBarItem(.second, title: "Second", icon: "tortoise", selectedIcon: "tortoise.fill")
}
.padding(.top, 8)
}
.frame(height: 50)
.background(Color.white.edgesIgnoringSafeArea(.all))
}
func tabBarItem(_ tab: Tab, title: String, icon: String, selectedIcon: String) -> some View {
ZStack(alignment: .topTrailing) {
VStack(spacing: 3) {
VStack {
Image(systemName: (selectedTab == tab ? selectedIcon : icon))
.font(.system(size: 24))
.foregroundColor(selectedTab == tab ? .primary : .black)
}
.frame(width: 55, height: 28)
Text(title)
.font(.system(size: 11))
.foregroundColor(selectedTab == tab ? .primary : .black)
}
}
.frame(width: 65, height: 42)
.onTapGesture {
selectedTab = tab
}
}
}
This solution also allows a lot of customization in the TabBar.
You can add some notifications badges, for example.
If we talk about standard TabView, the possible workaround solution can be based on TabBarAccessor from my answer on Programmatically detect Tab Bar or TabView height in SwiftUI
Here is a required modification in tab item holding NavigationView. Tested with Xcode 11.4 / iOS 13.4
struct FirstTabView: View {
#State private var tabBar: UITabBar! = nil
var body: some View {
NavigationView {
NavigationLink(destination:
FirstChildView()
.onAppear { self.tabBar.isHidden = true } // !!
.onDisappear { self.tabBar.isHidden = false } // !!
) {
Text("Go to...")
}
.navigationBarTitle("FirstTitle", displayMode: .inline)
}
.background(TabBarAccessor { tabbar in // << here !!
self.tabBar = tabbar
})
}
}
Note: or course if FirstTabView should be reusable and can be instantiated standalone, then tabBar property inside should be made optional and handle ansbsent tabBar explicitly.
Thanks to another Asperi's answer I was able to find a solution which does not break animations and looks natural.
struct ContentView: View {
#State private var tabSelection = 1
var body: some View {
NavigationView {
TabView(selection: $tabSelection) {
FirstView()
.tabItem {
Text("1")
}
.tag(1)
SecondView()
.tabItem {
Text("2")
}
.tag(2)
}
// global, for all child views
.navigationBarTitle(Text(navigationBarTitle), displayMode: .inline)
.navigationBarHidden(navigationBarHidden)
.navigationBarItems(leading: navigationBarLeadingItems, trailing: navigationBarTrailingItems)
}
}
}
struct FirstView: View {
var body: some View {
NavigationLink(destination: Text("Some detail link")) {
Text("Go to...")
}
}
}
struct SecondView: View {
var body: some View {
Text("We are in the SecondView")
}
}
Compute navigationBarTitle and navigationBarItems dynamically:
private extension ContentView {
var navigationBarTitle: String {
tabSelection == 1 ? "FirstView" : "SecondView"
}
var navigationBarHidden: Bool {
tabSelection == 3
}
#ViewBuilder
var navigationBarLeadingItems: some View {
if tabSelection == 1 {
Text("+")
}
}
#ViewBuilder
var navigationBarTrailingItems: some View {
if tabSelection == 1 {
Text("-")
}
}
}
How about,
struct TabSelectionView: View {
#State private var currentTab: Tab = .Scan
private enum Tab: String {
case Scan, Validate, Settings
}
var body: some View {
TabView(selection: $currentTab){
ScanView()
.tabItem {
Label(Tab.Scan.rawValue, systemImage: "square.and.pencil")
}
.tag(Tab.Scan)
ValidateView()
.tabItem {
Label(Tab.Validate.rawValue, systemImage: "list.dash")
}
.tag(Tab.Validate)
SettingsView()
.tabItem {
Label(Tab.Settings.rawValue, systemImage: "list.dash")
}
.tag(Tab.Settings)
}
.navigationBarTitle(Text(currentTab.rawValue), displayMode: .inline)
}
}
I also faced this problem. I don't want to rewrite, but the solution is in my github. I wrote everything in detail there
https://github.com/BrotskyS/AdvancedNavigationWithTabView
P.S: I have no reputation to write comments. Hikeland's solution is not bad. But you do not save the State of the page. If you have a ScrollView, it will reset to zero every time when you change tab
Also you can create very similar custom navBar for views in TabView
struct CustomNavBarView<Content>: View where Content: View {
var title: String = ""
let content: Content
init(title: String, #ViewBuilder content: () -> Content) {
self.title = title
self.content = content()
}
var body: some View {
content
.safeAreaInset(edge: .top, content: {
HStack{
Spacer()
Text(title)
.fontWeight(.semibold)
Spacer()
}
.padding(.bottom, 10)
.frame(height: 40)
.frame(maxWidth: .infinity)
.background(.ultraThinMaterial)
.overlay {
Divider()
.frame(maxHeight: .infinity, alignment: .bottom)
}
})
}
}
CustomNavBarView(title: "Create ad"){
ZStack{
NavigationLink(destination: SetPinMapView(currentRegion: $vm.region, region: vm.region), isActive: $vm.showFullMap) {
Color.clear
}
Color("Background").ignoresSafeArea()
content
}
}