I have problem with Views that have onTapGesture and are placed inside ScollView
This onTapGesture is not always reacting to tap gesture.
I need to tap precisely on such view.
It seems like there is conflict with ScrollView drag?
I've tried
highPriorityGesture
onTapGesture
gesture(DragGesture(minimumDistance:0).onChange { })
gesture(TapGesture().onEnded { })
Views have contentShape(Rectangle()) added to them
It somtimes works ok sometimes doesn't. On simulature it most of the time works ok, on physical device it is much worse.
ScrollViewReader { proxy in
HStack(spacing: spacing) {
ForEach(0 ..< elements.count, id: \.self) { i in
Text(elements[i])
.fixedSize()
.contentShape(Rectangle())
.onTapGesture {
withAnimation {
selectedElement = i
}
}
}
I couldn't reproduce the behavior that you describe with that example code, but maybe you could try the following modifier in case another gesture is operating at the same time:
.simultaneousGesture(TapGesture().onEnded({
selectedElement = 1
}))
Related
Faced with a very strange ScrollView behavior on macOS. The content freezes under the mouse during horizontal scrolling. But it is worth taking the mouse away from the window and the content scrolls normally.
This happens when I try to use a vertical scroll inside a horizontal one:
struct ScrollTestView: View {
var body: some View {
ScrollView(.horizontal) {
ScrollView(.vertical) {
VStack {
ForEach(0..<20, id: \.self) { row in
HStack {
ForEach(0..<20, id: \.self) { item in
Text("\(item)")
.font(.title)
.padding()
.background {
Color.gray
}
}
}
}
}
}
}
}
}
Yes, I know that I can use the same ScrollView for both axes simultaneously, but I need solution with two ScrollViews because of desired UX.
This solution is perfectly works on iOS, but I have this strange behavior on macOS.
Also if you swap a horizontal and a vertical ScrollView in the exact same code, everything works just fine:
struct ScrollTestView: View {
var body: some View {
ScrollView(.vertical) {
ScrollView(.horizontal) {
// ...
}
}
}
}
Looks like this is a SwiftUI bug, but I am not sure, maybe I am missing something?
Any ideas?
I'm seeing a weird behavior that is affecting one of my views in SwiftUI after upgrading to iOS 16.
Just to give some context, here is the stack:
Xcode 14
Simulator or real device on iOS 15.5 and 16
Considering the minimum reproducible code below:
struct ContentView: View {
#State private var isPresented: Bool = false
var body: some View {
GeometryReader { reader in
VStack(spacing: 36) {
Text("Screen frame:\n\(String(describing: reader.frame(in: .global)))")
.multilineTextAlignment(.center)
Button {
isPresented.toggle()
} label: {
Text("Open modal")
}
}
.frame(maxWidth: .infinity, maxHeight: .infinity)
.padding()
.onReceive(NotificationCenter.default.appDidBecomeActive()) { _ in
print(reader.frame(in: .global))
}
.onReceive(NotificationCenter.default.appDidEnterBackground()) { _ in
print(reader.frame(in: .global))
}
}
.sheet(isPresented: $isPresented) {
modalView
}
}
private var modalView: some View {
VStack {
Image(systemName: "globe")
.imageScale(.large)
.foregroundColor(.accentColor)
Text("Hello, world!")
}
.padding()
}
}
extension NotificationCenter {
func appDidBecomeActive() -> AnyPublisher<Notification, Never> {
publisher(for: UIApplication.didBecomeActiveNotification).eraseToAnyPublisher()
}
func appDidEnterBackground() -> AnyPublisher<Notification, Never> {
publisher(for: UIApplication.didEnterBackgroundNotification).eraseToAnyPublisher()
}
}
As soon the view starts, it's possible to see the frame available due to the GeometryReader. Then following the steps:
Open the modal view
Send the app to the background
Open the app again
Close the modal
It's possible to see that the frame changed, and the values match with the 3D effect when a view is presenting another view, and it's never changing again to the right values unless you send the app again to the background or switch views (e.g. using a TabView).
I don't find anything on iOS release notes talking about it, so I supposed it must be a bug (I've filled out a bug report already).
On iOS 15, the frame value keeps stable at the same value.
I have a couple of views relying on the value of a GeometryReader, and it's causing my view to deform because of this issue. Does anyone know a way to force the recalculation for the GeometryReader for this case?
Any help is appreciated.
The issue won't occur if you control the display of the sheet with the new presentationDetents method, provided you do not request to cover the entire screen.
I modified your code as follows:
.sheet(isPresented: $isPresented) {
if #available(iOS 16, *) {
modalView
.presentationDetents([.fraction(0.99)])
}
else {
modalView
}
}
The issue will remain if you request .fraction(1), i.e. covering the whole screen.
Very novice to the app development game. I am trying to put this toolbar above the .decimalPad and I cannot get this large gap to go away.
VStack {
Rectangle()
.foregroundColor(Color(UIColor.systemBackground))
.frame(height: 35)
.overlay {
HStack {
Spacer()
Button(action: {
isTextFieldFocused = false
}) { Text("Done")}
}
.offset(y: -3)
.padding(.trailing)
}
.opacity(isTextFieldFocused ? 1 : 0)
.ignoresSafeArea(.keyboard) //This makes sure the bottom tab bar stays below the keyboard.
}
I initially thought it was something in another view causing the spacing, but I managed to parse through the views in the canvas and it does it regardless.
Here is what I'd like it to look like, for reference.
What I want
To add a Button onto your keyboard, you use a .toolbar with the locations to .keyboard like this:
TextField("Enter Text", text: $text)
.toolbar {
ToolbarItemGroup(placement: .keyboard) {
Button(action: {
isTextFieldFocused = false
}) { Text("Done")}
// If you want it leading, then use a Spacer() after
Spacer()
}
}
You were overthinking it by adding the Rectangle. This is why we look for minimal reproducible examples. We can dial in the fix for your specific code.
I am quite new to swiftUI. I have created a grid view on tapping on which I want to go to next screen. But somehow I am not able to manage to push to next screen. I am doing like this:
var body: some View {
NavigationView {
ScrollView {
LazyVGrid(columns: gridItems, spacing: 16) {
ForEach(viewModel.pokemon) { pokemon in
PokemonCell(pokemon: pokemon, viewModel: viewModel)
.onTapGesture {
NavigationLink(destination: PokemonDetailView(pokemon: pokemon)) {
Text(pokemon.name)
}
}
}
}
}
.navigationTitle("Pokedex")
}
}
Upon doing like this, I am getting a warning stating
Result of 'NavigationLink<Label, Destination>' initializer is unused
Can someone please guide me, how to do this?
.onTapGesture adds an action to perform when the view recognizes a tap gesture. In your case you don't need to use .onTapGesture. If you want to go to another view when cell is tapped you need to write NavigationLink as below.
NavigationLink(destination: PokemonDetailView(pokemon: pokemon)) {
PokemonCell(pokemon: pokemon, viewModel: viewModel)
}
If you want to use .onTapGesture, another approach is creating #State for your tapped cell's pokemon and using NavigationLink's isActive binding. So when user tap the cell it will change the #State and toggle the isActive in .onTapGesture. You may need to add another Stack (ZStack etc.) for this.
NavigationView {
ZStack {
NavigationLink("", destination: PokemonDetailView(pokemon: pokemon), isActive: $isNavigationActive).hidden()
ScrollView {
// ...
My need is simple but I can't seem to figure a way (and many posts are rather complicated or are old/for iOS).
I have a NavigationView with NavigationLink and it all works fine. For certain reasons, I'd like to know the item the user clicked on because it's used for other actions on the view.
I tried putting a button inside the NavigationView but then only the button action fires, but the link doesn't work.
I tried OnTapGesture - then the function fires but isn't propagated so the detail view never shows up.
What am I missing? Is there some way I can do this without overcomplicating?
ForEach(anArray, id: \.self) { entry in
NavigationLink(destination: SettingsView(s: entry)
{
Text("something")
}.onTapGesture {print("Hello")}
}
Here is the solution, actually use a button that does some action and activates a link
Tested with Xcode 11.5b2
#State private var activatedLink: Int? = nil
// ... other code
ForEach(Array(anArray.enumerated()), id: \.element) { (i, entry) in
Button("something") {
print(">> some action")
self.activatedLink = i // << order might be important !!
}.background(
NavigationLink(destination: SettingsView(s: entry), tag: i, selection: $activatedLink) { EmptyView() }
.buttonStyle(PlainButtonStyle()) // << required !!
)
}