In my SwiftUI View I have a ScrollView filled with text for attribution to show what frameworks were used in my app.
Once this text scrolls past the navigation bar it should be hidden past that point to the very top of the iPhone screen BUT in my case the text reappears because my navigation bar seems to only be a certain height (see image below) and does not extend to the top of the screen and prevent text from reappearing.
The attribution view below is inside of a AboutView which is also inside of a SettingsView that contains a NavigationView.
Any idea why this is happening? Image is attached..
TEXT RE-APPEARING PAST NAVIGATION BAR
PARENT VIEW
struct Settings: View {
#Environment(\.presentationMode) var presentation
#State private var presentAbout: Bool = false
var body: some View {
NavigationView {
VStack {
Text("About").onTapGesture { presentAbout.toggle() }
}
.navigationBarTitle("Settings", displayMode: .inline)
.navigationBarBackButtonHidden(true)
.toolbar(content: {
Button(action: {
self.presentation.wrappedValue.dismiss()
}, label: { Text("Cancel") })
})
.background ( NavigationLink("", destination: AboutMenu(), isActive: $presentAbout ))
}
}
}
SUB VIEW 1
struct AboutMenu: View {
#Environment(\.presentationMode) var presentation
#State private var presentAttribution: Bool = false
var body: some View {
VStack {
Text("Attribution").onTapGesture { presentAttribution.toggle() }
}
.navigationBarTitle("About", displayMode: .inline)
.navigationBarBackButtonHidden(true)
.toolbar(content: {
ToolbarItem(placement: .navigationBarLeading) {
Button(action: { self.presentation.wrappedValue.dismiss() }, label: {
Image(systemName: "chevron.backward")
}
})
.background ( NavigationLink("", destination: Attribution(), isActive: $presentAttribution))
}
}
SUB VIEW 2 Where problem exists.
struct Attribution: View {
#Environment(\.presentationMode) var presentation
var body: some View {
VStack {
ScrollView {
Text(attribution) // <- THIS TEXT shows behind NavigationBar past the navigation bar.
}
}
.navigationBarTitle("Attribution", displayMode: .inline)
.navigationBarBackButtonHidden(true)
.toolbar(content: {
ToolbarItem(placement: .navigationBarLeading) {
Button(action: { self.presentation.wrappedValue.dismiss() }, label: {
Image(systemName: "chevron.backward")
}
})
}
}
This can happen when ScrollView is not root view of the NavigationView, so it does not recognise scroll view presence.
It can be fixed by explicit clipping, like
VStack {
ScrollView {
Text(introText)
}
.clipped() // << here !!
Related
I wrote a simple Swift UI app that creates a NavigationLink on the navigation toolbar and creates a status bar at the bottom of the display. When clicking on the gear link on the navigation bar, it takes you to the child view, but when you return to the parent view, the status bar gets hidden. If you click on the NavigationLink in the middle of the screen and return to the parent view, the status bar gets displayed again.
This looks like a bug in Swift UI and does anyone know how to fix?
import SwiftUI
struct ContentView: View {
var body: some View {
NavigationView {
NavigationLink(destination: Text("Child view")) {
Text("Hello, World!")
}
.toolbar {
ToolbarItem(placement: .navigationBarTrailing, content: {
NavigationLink(destination: Text("Settings view"),
label: { Image(systemName: "gearshape.fill")
})
})
ToolbarItem(placement: .status, content: {
Text("Checking for messages...")
})
}
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
The issue is that Swift UI doesn't handle NavigationLink properly inside a toolbar.
The workaround is to place a Button into a toolbar and use a hidden NavigationLink in the code.
This is a link to the answer that resolved my issue.
SwiftUI - Make toolbar's NavigationLink use detail view
Here is the code that implements my original code with the workaround.
struct ContentView: View {
#State var settingsLinkSelected = false
var body: some View {
NavigationView {
NavigationLink(destination: Text("Second view")) {
Text("Hello, World!")
}
.toolbar {
ToolbarItem(placement: .navigationBarTrailing,
content: { Button(action: { settingsLinkSelected = true },
label: { Image(systemName: "gearshape.fill") }) })
ToolbarItem(placement: .status,
content: { Text("Checking for messages...") })
}
.background(
NavigationLink(
destination: Text("Settings View"),
isActive: $settingsLinkSelected
) {
EmptyView()
}.hidden()
)
}
}
}
I have 3 views. One of these have NavigationView second have NavigationLink and last just a child with toolbar.
So my problem when I added toolbar in last view backButton elegant disappear. How can I solve this?
Screen recording of my problem
import SwiftUI
struct ContentView: View {
var body: some View {
NavigationView {
VStack {
Text("Hello, world!")
.padding()
NavigationLink(destination: ListView()) {
Image(systemName: "trash")
.font(.largeTitle)
.foregroundColor(.red)
}
}.navigationBarHidden(true)
.navigationTitle("Image")
}
}
}
import SwiftUI
struct ListView: View {
#Environment(\.presentationMode) var presentationMode: Binding<PresentationMode>
var body: some View {
VStack {
List {
NavigationLink(destination: DetailView()) {
Text("Detail")
}
}
}.navigationBarTitle(Text("Data"), displayMode: .large)
.toolbar {
Button("Save") {
presentationMode.wrappedValue.dismiss()
}
}
}
}
import SwiftUI
struct DetailView: View {
#Environment(\.presentationMode) var presentationMode: Binding<PresentationMode>
var body: some View {
VStack {
Text("DetailView")
.padding()
}.navigationBarTitle(Text("Data"), displayMode: .large)
.toolbar {
Button("Save") {
presentationMode.wrappedValue.dismiss()
}
}
}
}
In the console, you'll notice this message:
2021-04-27 12:37:36.862733-0700 MyApp[12739:255441] [Assert] displayModeButtonItem is internally managed and not exposed for DoubleColumn style. Returning an empty, disconnected UIBarButtonItem to fulfill the non-null contract.
The default style for NavigationView is usually DefaultNavigationViewStyle, which is really just DoubleColumnNavigationViewStyle. Use StackNavigationViewStyle instead, and it works as expected.
Edit: You are right that StackNavigationViewStyle will break iPad split view. But thankfully, DoubleColumnNavigationViewStyle works fine in iPad and doesn't hide the back button. We can then just use a different NavigationStyle depending on the device, as shown in this answer.
struct ResponsiveNavigationStyle: ViewModifier {
#Environment(\.horizontalSizeClass) var horizontalSizeClass
#ViewBuilder
func body(content: Content) -> some View {
if horizontalSizeClass == .compact { /// iPhone
content.navigationViewStyle(StackNavigationViewStyle())
} else { /// iPad or larger iPhone in landscape
content.navigationViewStyle(DoubleColumnNavigationViewStyle())
}
}
}
struct ContentView: View {
var body: some View {
NavigationView {
VStack {
Text("Hello, world!")
.padding()
NavigationLink(destination: ListView()) {
Image(systemName: "trash")
.font(.largeTitle)
.foregroundColor(.red)
}
}
.navigationBarHidden(true)
.navigationTitle("Image")
}
.modifier(ResponsiveNavigationStyle()) /// here!
}
}
Result:
iPad
iPhone
I don't know why, but it's what worked for me:
.toolbar {
ToolbarItem(placement: .navigationBarTrailing) {
Button { } label: { } // button to the right
}
ToolbarItem(placement: .navigationBarLeading) {
Text("") // empty text in left to prevent back button to disappear
}
}
I already tried to replace the empty text with EmptyView() but the button keeps disappearing.
FYI: I have this problem only on my device with iOS 14, but in another device with iOS 15 the back button never disappears.
I have two views, one leads to the other. I want that the second view uses the title of the first view for the back button, which should then be: "<View1".
I don't want to show the title in the first view.
Problem: I can't hide navigation bar because it will also hide a custom button which is within it. Setting .navigationTitle("") hides the title in the first view, but also hides it from the back button in the second view.
What I have now:
What I would like to have:
Code:
struct ContentView: View {
#State var isLinkActive = false
var body: some View {
NavigationView {
VStack {
NavigationLink("go to the second view", destination: SecondView(), isActive: $isLinkActive).navigationTitle("View1")
.navigationBarItems(leading: Button(action: {
()
}, label: {
Text("custom button")
}))
}
}.navigationViewStyle(StackNavigationViewStyle())
}
private func btnPressed() {
isLinkActive = true
}
}
struct SecondView: View {
var body: some View {
Color.blue
}
}
You need to create custom back button for destination view as well,and you shouldn’t set navigation title for navigationLink, that’s why you are not able to hide “View1” correctly.
Check below code.
import SwiftUI
struct Test: View {
#State var isLinkActive = false
var body: some View {
NavigationView {
VStack {
NavigationLink("go to the second view", destination: SecondView()
.navigationBarBackButtonHidden(true)
.navigationBarItems(leading: Button(action: {
isLinkActive = false
}, label: {
HStack{
Image(systemName: "backward.frame.fill")
Text("View1")
}
})) ,
isActive: $isLinkActive)
}.navigationBarItems(leading: Button(action: {
()
}, label: {
Text("custom button")
}))
}.navigationViewStyle(StackNavigationViewStyle())
}
private func btnPressed() {
isLinkActive = true
}
}
struct SecondView: View {
var body: some View {
Color.blue
}
}
You can try and make navigationBar code as reusable component, because you might need to do this at multiple places.
Output-:
I achieved this by using two modifiers on my main view. Similar to your case, I didn't want a title on the first view, but I wanted the back button on the pushed view to read < Home, not < Back.
.navigationTitle("Home")
.toolbar {
ToolbarItem(placement: .principal) {
Text("")
}
}
I am trying to present a sheet from a sub view selected from the menu item on the navigation bar but the modal Sheet does does not display. I spent a few days trying to debug but could not pin point the problem.
I am sorry, this is a little confusing and will show a simplified version of the code to reproduce. But in a nutshell, the problem seems to be a sheet view that I have as part of the main view. Removing the sheet code from the main view displays the sheet from the sub view. Unfortunately, I don't have the freedom to change the Mainview.swift
Let me show some code to make it easy to understand....
First, before showing the code, the steps to repeat the problem:
click on the circle with 3 dots in the navigation bar
select the second item (Subview)
click on the "Edit Parameters" button and the EditParameters() view will not display
ContentView.swift (just calls the Mainview()). Included code to copy for reproducing issue :-)
struct ContentView: View {
var body: some View {
NavigationView {
VStack {
Mainview()
}
}
}
}
Mainview.swift. This is a simplified version of the actual App which is quite complex and I don't have leeway to change much here unfortunately!
fileprivate enum CurrentView {
case summary, sub
}
enum OptionSheet: Identifiable {
var id: Self {self}
case add
}
struct Mainview: View {
#State private var currentView: CurrentView? = .summary
#State private var showSheet: OptionSheet? = nil
var body: some View {
GeometryReader { g in
content.frame(width: g.size.width, height: g.size.height)
.navigationBarTitle("Main", displayMode: .inline)
}
//Removing the below sheet view will display the sheet from the subview but with this sheet here, it the sheet from subview does not work. This is required as these action items are accessed from the second menu item (circle and arrow) navigation baritem
.sheet(item: $showSheet, content: { mode in
sheetContent(for: mode)
})
.toolbar {
HStack {
trailingBarItems
actionItems
}
}
}
var actionItems: some View {
Menu {
Button(action: {
showSheet = .add
}) {
Label("Add Elements", systemImage: "plus")
}
} label: {
Image(systemName: "cursorarrow.click").resizable()
}
}
var trailingBarItems: some View {
Menu {
Button(action: {currentView = .summary}) {
Label("Summary", systemImage: "list.bullet.rectangle")
}
Button(action: {currentView = .sub}) {
Label("Subview", systemImage: "circle")
}
} label: {
Image(systemName: "ellipsis.circle").resizable()
}
}
#ViewBuilder
func sheetContent(for mode: OptionSheet) -> some View {
switch mode {
case .add:
AddElements()
}
}
#ViewBuilder
var content: some View {
if let currentView = currentView {
switch currentView {
case .summary:
SummaryView()
case .sub:
SubView()
}
}
}
}
Subview.swift. This is the file that contains the button "Edit Parameters" which does not display the sheet. I am trying to display the sheet from this view.
struct SubView: View {
#State private var editParameters: Bool = false
var body: some View {
VStack {
Button(action: {
editParameters.toggle()
}, label: {
HStack {
Image(systemName: "square.and.pencil")
.font(.headline)
Text("Edit Parameters")
.fontWeight(.semibold)
.font(.headline)
}
})
.padding(10)
.foregroundColor(Color.white)
.background(Color(.systemBlue))
.cornerRadius(20)
.sheet(isPresented: $editParameters, content: {
EditParameterView()
})
.padding()
Text("Subview....")
}
.padding()
}
}
EditParameters.swift. This is the view it should display when the Edit Parameters button is pressed
struct EditParameterView: View {
var body: some View {
Text("Edit Parameters...")
}
}
Summaryview.swift. Nothing special here. just including for completeness
struct SummaryView: View {
var body: some View {
Text("Summary View")
}
}
In SwiftUI, you can't have 2 .sheet() modifiers on the same hierarchy. Here, the first .sheet() modifier is on one of the parent views to the second .sheet(). The easy solution is to move one of the .sheets() so it's own hierarchy.
You could either use ZStacks:
var body: some View {
ZStack {
GeometryReader { g in
content.frame(width: g.size.width, height: g.size.height)
.navigationBarTitle("Main", displayMode: .inline)
}
ZStack{ }
.sheet(item: $showSheet, content: { mode in
sheetContent(for: mode)
})
}
.toolbar {
HStack {
trailingBarItems
actionItems
}
}
}
or more elegantly:
var body: some View {
GeometryReader { g in
content.frame(width: g.size.width, height: g.size.height)
.navigationBarTitle("Main", displayMode: .inline)
}
.background(
ZStack{ }
.sheet(item: $showSheet, content: { mode in
sheetContent(for: mode)
})
)
.toolbar {
HStack {
trailingBarItems
actionItems
}
}
}
I'm trying replicate the behavior of iOS Photos app.
Till now the thing I can't figure how could be done is the select mode, where when I press the button select how I can change the bottom bar?
Graphically, what I intend is, in this view:
When I pressed the button, the bottom bar changes to:
In the real project the views are embed inside a NavigationView
The code of the main view is similar to
struct ContentView: View {
var body: some View {
NavigationView{
TabView{
data()
.tabItem {
Text("Data")
}
data2()
.tabItem {
Text("Data")
}
}
}
}
I'm using Xcode 12 and swiftUI 2.0
First we need Conditional modifier like that https://stackoverflow.com/a/61253769/2715636
struct conditionalModifier: ViewModifier {
var isShowing: Bool
func body(content: Content) -> some View {
Group {
if self.isShowing {
content
.toolbar {
ToolbarItem(placement: .bottomBar, content: {
Button(action: {
}){
Image(systemName: "square.and.arrow.up")
}
})
}
.toolbar {
ToolbarItem(placement: .status, content: {
Text("Toolbar")
.fontWeight(.bold)
})
}
}
}
}}
I don't need else statement cause I only want to see Toolbar
else { content }
And here is my Tabbar inside ZStack. We're gonna overlay it with Text using Conditional modifier applied to Text
struct ContentView: View {
#State private var showToolbar: Bool = false
var body: some View {
Button(action: {
showToolbar.toggle()
}, label: {
Text(showToolbar ? "Show Tabbar" : "Show Toolbar")
}).padding()
ZStack {
TabView {
someView()
.tabItem {
Image(systemName: "placeholdertext.fill")
Text("Tab 1")
}
someView()
.tabItem {
Image(systemName: "placeholdertext.fill")
Text("Tab ")
}
someView()
.tabItem {
Image(systemName: "placeholdertext.fill")
Text("Tab 3")
}
}
Text("")
.modifier(conditionalModifier(isShowing: showToolbar))
}
}}
Final result
tabbar to toolbar
There's a new view modifier in iOS 16 that let you switch the tab bar and the bottom bar.
https://developer.apple.com/documentation/swiftui/view/toolbar(_:for:)
For example,
ContentView()
.toolbar(isSelecting ? .visible : .hidden, for: .bottomBar)
.toolbar(isSelecting ? .hidden : .visible, for: .tabBar)