onFocusChange not triggered in SwiftUI tvOS - ios

I am trying to set onFocusChange and click action function on a view. But onFocusChange is never called.
ScrollView(.horizontal, showsIndicators: false) {
HStack(alignment: .center, spacing: 5) {
ForEach(self.videos, id: \.id) { video in
Button(action: {
print("clicked")
}){
ItemView(vid: video)
.cornerRadius(5).padding(1)
}.focusable(true, onFocusChange: {
hasFocus in
print("focused")
})
}
}
}
If I move the button view inside the ItemView(), the onFocusChange works but the click action doesn't.

The goal the question is unclear, but here is a simple demo of alternate approach to have managed focused & button click using custom button style. Maybe this will be helpful.
Tested with Xcode 12 / tvOS 14 (Simulator) - compare regular button vs custom button
struct MyButtonStyle: ButtonStyle {
func makeBody(configuration: Configuration) -> some View {
configuration.label
.scaleEffect(configuration.isPressed ? 1.2 : 1)
}
}
struct ContentView: View {
#State private var focused = false
var body: some View {
VStack {
Button(action: {
print(">>>> custom button")
}) { LabelView() }.buttonStyle(MyButtonStyle())
Button("Regular Button") {
print(">> regular button")
}
}
}
}
struct LabelView: View {
#Environment(\.isFocused) var focused: Bool
var body: some View {
RoundedRectangle(cornerRadius: 25.0)
.frame(width: 200, height: 100)
.foregroundColor(focused ? .blue : .gray)
.overlay(Text("Title").foregroundColor(.white))
}
}

Related

Updating tapGesture area(frame) after device is rotated SwiftUI

I have an issue with updating the area(frame) of .onTapGesture after a device is rotated. Basically, even after changing #State var orientation the area where .onTapGesture works remain the same as on the previous orientation.
Would appreciate having any advice on how to reset that tap gesture to the new area after rotation.
Thanks in advance!
struct ContentView: View {
var viewModel = SettingsSideMenuViewModel()
var body: some View {
VStack {
SideMenu(viewModel: viewModel)
Button("Present menu") {
viewModel.isShown.toggle()
}
Spacer()
}
.padding()
}
}
final class SettingsSideMenuViewModel: ObservableObject {
#Published var isShown = false
func dismissHostingController() {
guard !isShown else { return }
DispatchQueue.main.asyncAfter(deadline: .now() + 0.3) {
debugPrint("viewShoudBeDismissedHere")
}
}
}
struct SideMenu: View {
#ObservedObject var viewModel: SettingsSideMenuViewModel
#State private var orientation = UIDeviceOrientation.unknown
var sideBarWidth = UIScreen.main.bounds.size.width * 0.7
var body: some View {
GeometryReader { proxy in
ZStack {
GeometryReader { _ in
EmptyView()
}
.background(Color.black.opacity(0.6))
.opacity(viewModel.isShown ? 1 : 0)
.animation(.easeInOut.delay(0.2), value: viewModel.isShown)
.onTapGesture {
viewModel.isShown.toggle()
viewModel.dismissHostingController()
}
content
}
.edgesIgnoringSafeArea(.all)
.frame(width: proxy.size.width,
height: proxy.size.height)
.onRotate { newOrientation in
orientation = newOrientation
}
}
}
var content: some View {
HStack(alignment: .top) {
ZStack(alignment: .top) {
Color.white
Text("SOME VIEW HERE")
VStack(alignment: .leading, spacing: 20) {
Text("SOME VIEW HERE")
Divider()
Text("SOME VIEW HERE")
Divider()
Text("SOME VIEW HERE")
}
.padding(.top, 80)
.padding(.horizontal, 40)
}
.frame(width: sideBarWidth)
.offset(x: viewModel.isShown ? 0 : -sideBarWidth)
.animation(.default, value: viewModel.isShown)
Spacer()
}
}
}
struct DeviceRotationViewModifier: ViewModifier {
let action: (UIDeviceOrientation) -> Void
func body(content: Content) -> some View {
content
.onAppear()
.onReceive(NotificationCenter.default.publisher(for: UIDevice.orientationDidChangeNotification)) { _ in
action(UIDevice.current.orientation)
}
}
}
extension View {
func onRotate(perform action: #escaping (UIDeviceOrientation) -> Void) -> some View {
self.modifier(DeviceRotationViewModifier(action: action))
}
}
struct SideMenu_Previews: PreviewProvider {
static var viewModel = SettingsSideMenuViewModel()
static var previews: some View {
SideMenu(viewModel: viewModel)
}
}
In this example is just slideoutMenu with a blurred area. By opening that menu in portrait and taping on the blurred area this menu should close. The issue is when the menu is opened in portrait and then rotated to landscape - the tapGesture area stays the same as it was in portrait, hence if tapped in the landscape - nothing happens. This works in the same direction too. Thus the question is how to reset the tapGesture area on rotation?
This view is presented in UIHostingController. slideOutView?.modalPresentationStyle = .custom the issue is there. But if slideOutView?.modalPresentationStyle = .fullScreen (or whatever) - everything works okay.

SwiftUI Edges not ignored on simulator

I'm a SwiftUI trainee. On this particular view below there is an issue like in the image.
While .ignoreSafeArea(.bottom) or .edgesIgnoreSafeArea(.bottom) works on preview.
It does not work on the simulator. I would like to learn is it a bug or am I missing something. Thanks for your help ahead!
Issue screen shot
Updated Solution
The problem was caused by root view logic. When you use navigationLink to navigate another screen on root view causes this problem. I didnt want to use standard NavigationLink to navigate because it was freezing animations(Lottie) I'm playing on screen when you go to some screen via navigationLink and come back.
Below is the view code. Hopefully not that messy.
import SwiftUI
struct ChatView: View {
// MARK: properties
let userName : String
let userImageUrl : String
#ObservedObject var viewModel : ChatViewModel = ChatViewModel()
#ObservedObject var appState : NavigationController = NavigationController.shared
// MARK: body
var body: some View {
ZStack(alignment: .bottom) {
VStack {
buildNavigationBar()
buildMessages()
} // end of Vstack
.ignoresSafeArea(edges:.bottom)
buildInputRow()
} // end of Zstack
.ignoresSafeArea(edges:.bottom)
}
fileprivate func buildInputRow() -> some View {
return
HStack(alignment: .center){
DynamicHorizontalSpacer(size: 30)
Button {
} label: {
Image(systemName: "photo.circle.fill")
.font(.system(size: 35))
}
DynamicHorizontalSpacer(size: 25)
UnobscuredTextFieldView(textBinding: .constant("Hello"), promptText: "Type!", width: 180, color: .white)
DynamicHorizontalSpacer(size: 25)
Button {} label: {
Image(systemName: "paperplane.fill")
.font(.system(size: 30))
.foregroundColor(.accentColor)
}
Spacer()
} // end of HStack
.frame(width: .infinity, height: 100, alignment: .center)
.background(Color.gray.opacity(0.4).ignoresSafeArea(edges:.bottom))
}
fileprivate func buildMessages() -> some View {
return ScrollView(showsIndicators: false) {
ForEach(0...50, id : \.self) { index in
ChatTileView(index: index)
}
.padding(.horizontal,5)
} // end of scrollview
.ignoresSafeArea(edges:.bottom)
}
fileprivate func buildNavigationBar() -> ChatViewNavigationBar {
return ChatViewNavigationBar(userImageUrl: self.userImageUrl, userName: self.userName) {
appState.appState = .Home
}
}
}
fileprivate func buildMessageBox() -> some View {
return HStack(alignment: .center) {
Text(
"""
Fake message
"""
)
.font(.system(size:11))
.foregroundColor(.white)
}
}
}
fileprivate extension View {
func messageBoxModifier(index : Int) -> some View {
self
.multilineTextAlignment(index.isMultiple(of: 2) ?.trailing : .leading)
.frame(minHeight: 30)
.padding(.vertical,7)
.padding(.horizontal,10)
.background(index.isMultiple(of: 2) ? Color.green : Color.mint)
.cornerRadius(12)
.shadow(color: .black.opacity(0.3), radius: 5, y: 5)
}
}
some components used in eg. DynamicHorizantalSpacer
DynamicHorizontalSpacer && Vertical as well they share same logic
struct DynamicVerticalSpacer: View {
let size : CGFloat?
var body: some View {
Spacer()
.frame(width: 0, height: size ?? 20, alignment: .center)
}
}
TextField that I'm using.
struct UnobscuredTextFieldView: View {
#Binding var textBinding : String
let promptText: String
let width : CGFloat
let color : Color
var body: some View {
TextField(text: $textBinding, prompt: Text(promptText)) {
Text("Email")
}
.textFieldModifier()
.modifier(RoundedTextFieldModifier(color:color ,width: width))
}
}
fileprivate extension TextField {
func textFieldModifier() -> some View {
self
.textCase(.lowercase)
.textSelection(.disabled)
.disableAutocorrection(true)
.textInputAutocapitalization(.never)
.textContentType(.emailAddress)
}
}
The problem was caused by root view logic. When you use navigationLink to navigate another screen on root view causes this problem. I didnt want to use standard NavigationLink to navigate because it was freezing animations I'm playing on screen when you go to some screen via navigationLink and come back.

Navigation View -Notes Like Sidebar - Toggle button

I am very new to iOS development and Swift UI. I am making an app for our company. I believe Apple Notes like approach is best. I got most working tanks to some Udemmy courses and a couple of weeks of intense Googling. But I can't figure out how to implement the toggle sidebar button. I am probably searching for something obvious but using the wrong terminology.
I am talking about this:
When I remove most of the code, I have a structure like this:
NavigationView {
List {
Section(header: RoomHeader()) {
ForEach(sections) { section in
NavigationLink(destination: ViewRoom(section: section)) {
RoomListItem(section: section)
}
}
}
}
.navigationTitle("Rooms")
.listStyle(InsetGroupedListStyle())
}
The ViewRoom class
import SwiftUI
struct ViewRoom: View {
var room: RoomModel
var body: some View {
ZStack {
ScrollView {
VStack {
controls
title
// ....
}
.padding()
}
bottomBar
}
.navigationTitle(room.name)
.navigationBarItems(
trailing: HStack {
// ...
}
)
}
var controls: some View {
HStack {
Spacer()
// Couldn't find the icon on SF Symbols but this is the toggle button
Button(action: {}, label: {
Image(systemName: "rectangle.portrait.arrowtriangle.2.outward")
})
}
.font(.system(size: 24))
.padding(.top, 15)
}
// ...
}
I'd appreciate it if you could let me know if how to implement this toggle feature.
You can use Zstack & animation & transition features of SwiftUI. I made a sample for you to dig more into it and explore more about above mentioned concepts.
struct ContentView: View {
#State private var showDetails = false
var body: some View {
ZStack {
if showDetails {
LeftView()
.transition(.move(edge: .leading))
.zIndex(1)
} else {
Button("Press to show details") {
withAnimation(.spring()) {
showDetails.toggle()
}
}
}
}
.onTapGesture {
withAnimation(.spring()) {
showDetails.toggle()
}
}
}
}
Below is leftView which will animated from left
struct LeftView: View {
var body: some View {
GeometryReader { geometry in
VStack {
Text("Hello, World!")
}
.frame(width: 200, height: geometry.size.height)
.background(Color.blue)
}
}
}

SwiftUI NavigationLink for iOS 14.5 not working

I had the following code in Xcode 12.4 that worked perfectly
ScrollView(.horizontal, showsIndicators: false) {
LazyHGrid(rows: rows, spacing: 0) {
HStack {
if (type == "Quiz") {
NavigationLink(destination: Quiz(id: quiz.id)) {
VStack(alignment: .leading) {
Text("Quiz")
.font(.headline)
.foregroundColor(.white)
.padding(.top, 8)
.padding(.leading)
}
.background(Color.green)
.cornerRadius(12)
.shadow(color: .green, radius: 3, x: 0.0, y: 0.0)
}
} else {
NavigationLink(destination: Survey(id: survey.id)) {
VStack(alignment: .leading) {
Text("Survey")
.font(.headline)
.foregroundColor(.white)
.padding(.top, 8)
.padding(.leading)
}
.background(Color.green)
.cornerRadius(12)
.shadow(color: .green, radius: 3, x: 0.0, y: 0.0)
}
} // End If
if (type == "Quiz") {
NavigationLink(destination: QuizResults(id: quiz.id)) {
VStack(alignment: .leading) {
Text("Quiz Results")
.font(.headline)
.foregroundColor(.white)
.padding(.top, 8)
.padding(.leading)
}
.background(Color.blue)
.cornerRadius(12)
.shadow(color: .blue, radius: 3, x: 0.0, y: 0.0)
}
} else {
NavigationLink(destination: SurveyResults(id: survey.id)) {
VStack(alignment: .leading) {
Text("Survey Results")
.font(.headline)
.foregroundColor(.white)
.padding(.top, 8)
.padding(.leading)
}
.background(Color.blue)
.cornerRadius(12)
.shadow(color: .blue, radius: 3, x: 0.0, y: 0.0)
}
}
}
.padding([.leading, .trailing], 25)
}
.frame(height: 100)
I just updated Xcode to 12.5 and the above does not work any more.
It was working fine in 12.4!?
Now when I click the 'Quiz' element, it starts the transition to the Quiz View which is displays it but immediately closes the view and I'm back in the Detail View!?
Can someone see what I am doing wrong, and why now based on the update to 12.5 this stopped working?
UPDATE
I refined the code to the minimal possible reproducible form. What seems to be happening is that I have two or more NavigationLinks sets.
the first is the set to navigate the user to either the Quiz or Survey which the if statement addresses the user to the correct view to fill in.
Where the issue is in 12.5 is that the second set where the user can click to go see the overall results of the Quiz or Survey does not work when it's directly after the first navigation.
Like I said before hand it worked perfectly in 12.4 but seems like 12.5 does not agree with it. Can someone offer a better way for the user to click an element to either go fill in a quiz or survey or go see the results of a quiz or survey?
I got exactly the same problem, everything works fine with Xcode 12.4.
https://developer.apple.com/forums/thread/677333
I try to following this thread, it might work but on some case, I still have this bug.
NavigationLink(destination: EmptyView()) {
EmptyView()
}
Apparently, you can put this 3 lines of code close to your NavigationLink...
If someone got a better answer I will really appreciate it !
What a horrible bug! From my testing and some googling it happens when there are exactly 2 navigation links in a view. The code in the question has 4 but because of the if else statements there are effectively only 2 at a time.
I often don't know how many nav links I will have as it depends on what data the user has added/how many search hits there are etc. To be safe I've made a tripleEmptyNavigationLink modifier which I've stuck at the end of all my views. It's solving the popping behaviour but I'm still getting the 'Unable to present' warnings. Would love to know if anyone has anything better than this!
import SwiftUI
struct TripleEmptyNavigationLink: View {
var body: some View {
VStack {
NavigationLink(destination: EmptyView()) {EmptyView()}
NavigationLink(destination: EmptyView()) {EmptyView()}
NavigationLink(destination: EmptyView()) {EmptyView()}
}
}
}
struct TripleEmptyNavigationLinkBackground: ViewModifier {
func body(content: Content) -> some View {
content
.background(TripleEmptyNavigationLink())
}
}
extension View {
func tripleEmptyNavigationLink()-> some View {
self.modifier(TripleEmptyNavigationLinkBackground())
}
}
usage:
MyView()
.tripleEmptyNavigationLink()
In Xcode13 beta still has this issue.
So far solution:
1、Wrap NavigationLink with List or Form:
List {
NavigationLink(destination: Text("1")) {
Text("1")
}
NavigationLink(destination: Text("2")) {
Text("2")
}
NavigationLink(destination: Text("3")) {
Text("3")
}
}
2、Or Use one NavigationLink, and create destination view from func:
struct TaskIndexPage: View {
func buildView() -> some View {
// return you destination
switch self.option {
case 1:
return Text("\(option)")
default:
return Text("\(option)")
}
}
#State private var showDetail: Bool = false
#State private var option: Int = 0
var body: some View {
VStack {
Button {
showDetail = true
option = 1
} label: { Text("button 1") }
Button {
showDetail = true
option = 2
} label: { Text("button 2") }
Button {
showDetail = true
option = 3
} label: { Text("button 3") }
}
// handle navigating
NavigationLink(destination: self.buildView(), isActive: $showDetail) {}.opacity(0)
}
}
Adding a NavigationLink with an empty view didn't work for me. I solved my issue removing all NavigationLinks from the ForEach and using a single one to control the navigation to the detail view, a tap gesture and 2 state variables to keep track on what is being tapped on.
The example broken code and fix can be found at Paul Hudson's site.
https://www.hackingwithswift.com/forums/swiftui/unable-to-present-please-file-a-bug/7901/8237
Below is the complete working version
import SwiftUI
struct NavigationViewOptions {
enum OptionType { case main, optional }
typealias Option = (id: UUID, value: String, type: Self.OptionType)
static var options: [Option] = [
(UUID(), "Option 1", .main),
(UUID(), "Option 2", .optional),
(UUID(), "Option 3", .main),
(UUID(), "Option 4", .main),
(UUID(), "Option 5", .optional),
]
static func buildView(for option: Option) -> some View {
switch option.type {
case .main:
return Text("Main Option selected\n\(option.value)").font(.title).fontWeight(.bold)
case .optional:
return Text("Optional Option selected\n\(option.value)").font(.title3).italic().fontWeight(.medium)
}
}
}
struct NavigationViewWorking: View {
// State variables to leep track of what option has been tapped on and when to navigate to new view
#State private var selectedOption: NavigationViewOptions.Option = (id:UUID(),"",.main)
#State private var showDetail: Bool = false
var body: some View {
NavigationView {
ScrollView{
VStack (alignment:.leading) {
Text("NAVIGATION FIX FOR:\nUnable to present. Please file a bug.")
.padding(.bottom, 40)
ForEach(NavigationViewOptions.options, id: \.id) { option in
Text(option.value)
.font(.title)
.padding(.vertical, 10)
.foregroundColor(.accentColor) // same color as navigationLink
// handle tap on option
.onTapGesture {
selectedOption = option
showDetail = true
}
}
Spacer()
NavigationLink("", destination: NavigationViewOptions.buildView(for: selectedOption), isActive: $showDetail)
.opacity(0)
}
.navigationTitle("Options")
}
// INITIAL DETAIL VIEW
Text("Select option from the left")
}
}
}
For me the correct answer didn't work.
It showed Unable to present-message and then required view was pushed and poped out back quickly.
While playing around I found a working solution. I keep NotificationLink's without label set as a plain List items.
NavigationView {
ZStack {
List {
NavigationLink(isActive: $isFirstViewPresented,
destination: firstView,
label: EmptyView.init)
NavigationLink(isActive: $isSecondViewPresented,
destination: secondView,
label: EmptyView.init)
}
.listStyle(.plain)
//...
Button("Show first view") { isFirstViewPresented.toggle() }
Button("Show second view") { isSecondViewPresented.toggle() }
}
}
Don't forget to wrap active-properties with #State.
It also has some benefits as for me (all the navigation links are placed at the top of the view-getter and I don't need to look for it through all the code.
I could never find a reliable solution to this horrible bug. So I decided to create a custom NavigationLink, https://gist.github.com/Arutyun2312/a0dab7eecaa84bde99c435fecae76274. This works way better than expected, because all swiftui related functions continue working as usual. Seems like the bug is specifically with NavigationLink.
struct NavigationLink: View {
fileprivate init<T: View>(body: T) {
self.body = .init(body)
}
let body: AnyView
}
private struct NavigationLinkImpl<Destination: View, Label: View>: View {
let destination: () -> Destination?
#State var isActive = false
#ViewBuilder let label: () -> Label
var body: some View {
NavigationLinkImpl1(destination: destination, isActive: $isActive, label: label)
}
}
private struct NavigationLinkImpl1<Destination: View, Label: View>: View {
let destination: () -> Destination
#Binding var isActive: Bool
#ViewBuilder let label: () -> Label
#State var model = Model()
var body: some View {
Button(action: action, label: label)
.introspectNavigationController(customize: handle)
.id(isActive)
}
func handle(nav: UINavigationController) {
if isActive {
if model.destination == nil {
let dest = UIHostingController<Destination>(rootView: destination())
nav.pushViewController(dest, animated: true)
model.destination = dest
}
} else {
if let dest = model.destination {
if let i = nav.viewControllers.lastIndex(of: dest) {
nav.setViewControllers(.init(nav.viewControllers.prefix(i + 1)), animated: true)
}
model.destination = nil
}
}
if isActive != model.contains(nav: nav) { // detect pop
isActive = model.contains(nav: nav)
}
}
final class Model {
var destination: UIHostingController<Destination>?
func contains(nav: UINavigationController) -> Bool { destination.map { nav.viewControllers.contains($0) } ?? false }
}
func action() { isActive = true }
}
extension NavigationLink {
init<Destination: View, Label: View>(destination: #autoclosure #escaping () -> Destination, #ViewBuilder label: #escaping () -> Label) {
self.init(body: NavigationLinkImpl(destination: destination, label: label))
}
init<Destination: View, Label: View>(destination: #autoclosure #escaping () -> Destination, isActive: Binding<Bool>, #ViewBuilder label: #escaping () -> Label) {
self.init(body: NavigationLinkImpl1(destination: destination, isActive: isActive, label: label))
}
init<Destination: View>(_ text: String, destination: #autoclosure #escaping () -> Destination, isActive: Binding<Bool>) {
self.init(destination: destination(), isActive: isActive) { Text(text) }
}
init<Destination: View>(_ text: String, destination: #autoclosure #escaping () -> Destination) {
self.init(destination: destination()) { Text(text) }
}
}
Put this in a file, and your existing NavigationLinks will work just fine. Tested in ios 14 and 15
Like anybody else on iOS 14.5.1 my application is hit by this awful bug. I have more than 3 NavigationLinks in the page, and I was not lucky to modify the numbers of the NavigationLinks (by adding a dummy NavigationLink) to get the correct behaviour.
A workaround that is Okay for me is to add a NavigationLink conditionally into the view.
Instead of:
var body: some View {
NavigationLink(destination: AnotherView(), isActive: $someCondition) { EmptyView() }
}
I have this:
var body: some View {
if someCondition {
NavigationLink(destination: AnotherView(), isActive: $someCondition) { EmptyView() }
}
}
The behaviour is not exactly the same, as you lose some navigation animation candy, but at least you have a working application again with relatively easy to understand fix.
You can also short-circuit it to 14.5 only, and normal behaviour elsewhere:
/// Assumes this gets fixed by Apple until 14.6 is out
var onIOS14_5: Bool {
let systemVersion = UIDevice.current.systemVersion
return systemVersion.starts(with: "14.5")
}
var body: some View {
if !onIOS14_5 || someCondition {
NavigationLink(destination: AnotherView(), isActive: $someCondition) { EmptyView() }
}
}
Perhaps this helps someone and lets all hope Apple will fix this embarrasing bug. Now I want my half day back.
In my case, the NavigationLink didn't work because of an .onTapGesture I added to dismiss the keyboard.
I got exactly the same problem.
my code:
class NavigationManager: ObservableObject {
static let shared: NavigationManager = {
return NavigationManager()
}()
#Published var showingMain: Bool
#Published var showingSub: Bool
#Published var content: AnyView
init() {
showingMain = false
showingSub = false
content = AnyView(EmptyView())
}
func forward<T:View>(content: #escaping () -> T ) {
showView()
self.content = AnyView(content())
}
private func showView() {
if !showingMain,!showingSub {
showingMain = true
} else if showingMain,!showingSub {
showingSub = true
} else if !showingMain,showingSub {
showingMain = true
}
}
}
struct NavigationLinkGroup: View {
#EnvironmentObject var navigationManager: NavigationManager
var body: some View {
Group {
NavigationLink(destination: navigationManager.content, isActive: $navigationManager.showingMain) {EmptyView()}
NavigationLink(destination: navigationManager.content, isActive: $navigationManager.showingSub) {EmptyView()}
}
}
}
struct ContentView: View {
var body: some View {
NavigationView {
NavigationLinkGroup()
}
}
}
https://github.com/Ftrybe/CustomBackButtonOfSwiftUIApp/tree/master/CustomBackButtonOfSwiftUI
It seems that if there's more than one NavigationLink in NavigationView, this bug will be filed.
Here's my solution.
import SwiftUI
enum MyLink {
case myView1
case myView2
}
struct MyView1: View {
var body: some View {
Text("MyView1")
}
}
struct MyView2: View {
var body: some View {
Text("MyView2")
}
}
struct ExampleView: View {
#State var currentLink: MyLink = .myView1
#State var isLinkViewShow: Bool = false
func getLinkView(_ myLink: MyLink) -> some View {
if myLink == .myView1 {
return AnyView(MyView1())
} else {
return AnyView(MyView2())
}
}
var body: some View {
NavigationView {
VStack {
NavigationLink("",
destination: getLinkView(currentLink),
isActive: $isLinkViewShow)
// Press to navigate to MyView1
Button(action: {
currentLink = .myView1
isLinkViewShow = true
}) {
Text("To MyView1")
}
// Press to navigate to MyView2
Button(action: {
currentLink = .myView2
isLinkViewShow = true
}) {
Text("To MyView2")
}
}
}
}
}
Adding a delay gets auto-navigation working again.
NavigationLink(destination: PopupView(),isActive: $showView){}
&
.onAppear {
if (test()){
DispatchQueue.main.asyncAfter(deadline: .now() + 1) {showView = true}
}
}

SwiftUI: Custom button does not recognize touch with clear background and buttonStyle

I stumbled upon a weird behaviour for Buttons in SwiftUI in combination with a custom ButtonStyle.
My target was to create a custom ButtonStyle with some kind of 'push-back animation'. I used the following setup for this:
struct CustomButton<Content: View>: View {
private let content: () -> Content
init(content: #escaping () -> Content) {
self.content = content
}
var body: some View {
VStack {
Button(action: { ... }) {
content()
}
.buttonStyle(PushBackButtonStyle(pushBackScale: 0.9))
}
}
}
private struct PushBackButtonStyle: ButtonStyle {
let pushBackScale: CGFloat
func makeBody(configuration: Self.Configuration) -> some View {
configuration
.label
.scaleEffect(configuration.isPressed ? pushBackScale : 1.0)
}
}
// Preview
struct Playground_Previews: PreviewProvider {
static var previews: some View {
CustomButton {
VStack(spacing: 10) {
HStack {
Text("Button Text").background(Color.orange)
}
Divider()
HStack {
Text("Detail Text").background(Color.orange)
}
}
}
.background(Color.red)
}
}
When I now try to touch on this button outside of the Text view, nothing will happen. No animation will be visible and the action block will not be called.
What I found out so far:
when you remove the .buttonStyle(...) it does work as expected (no custom animation of course)
or when you set a .background(Color.red)) on the VStack in the CustomButton it does also work as expected in combination with the .buttonStyle(...)
The question now is if anybody have a better idea of how to properly work around this issue or how to fix it?
Just add hit testing content shape in your custom button style, like below
Tested with Xcode 11.4 / iOS 13.4
private struct PushBackButtonStyle: ButtonStyle {
let pushBackScale: CGFloat
func makeBody(configuration: Self.Configuration) -> some View {
configuration
.label
.contentShape(Rectangle()) // << fix !!
.scaleEffect(configuration.isPressed ? pushBackScale : 1.0)
}
}
Simply use a .frame and it should work.
To make it easily testable I have rewritten it like this:
struct CustomButton: View {
var body: some View {
Button(action: { }) {
VStack(spacing: 10) {
HStack {
Text("Button Text").background(Color.orange)
.frame(minWidth: 0, maxWidth: .infinity)
.background(Color.orange)
}
Divider()
HStack {
Text("Detail Text").background(Color.orange)
.frame(minWidth: 0, maxWidth: .infinity)
.background(Color.orange)
}
}
}
.buttonStyle(PushBackButtonStyle(pushBackScale: 0.9))
}
}
private struct PushBackButtonStyle: ButtonStyle {
let pushBackScale: CGFloat
func makeBody(configuration: Self.Configuration) -> some View {
configuration
.label
.scaleEffect(configuration.isPressed ? pushBackScale : 1.0)
}
}
I hope I could help. :-)
#Edit With video.

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