Does anyone have working Swiftui code that will produce a search bar in the navigation bar that is inline with the back button? As if it is a toolbar item.
Currently I have code that will produce a search bar below the navigation back button but would like it in line like the picture attached shows (where the "hi" is):
I am using code that I found in an example:
var body: some View {
let shopList = genShopList(receiptList: allReceipts)
VStack{
}
.navigationBarSearch(self.$searchInput)
}
public extension View {
public func navigationBarSearch(_ searchText: Binding<String>) -> some View {
return overlay(SearchBar(text: searchText)
.frame(width: 0, height: 0))
}
}
fileprivate struct SearchBar: UIViewControllerRepresentable {
#Binding
var text: String
init(text: Binding<String>) {
self._text = text
}
func makeUIViewController(context: Context) -> SearchBarWrapperController {
return SearchBarWrapperController()
}
func updateUIViewController(_ controller: SearchBarWrapperController, context: Context) {
controller.searchController = context.coordinator.searchController
}
func makeCoordinator() -> Coordinator {
return Coordinator(text: $text)
}
class Coordinator: NSObject, UISearchResultsUpdating {
#Binding
var text: String
let searchController: UISearchController
private var subscription: AnyCancellable?
init(text: Binding<String>) {
self._text = text
self.searchController = UISearchController(searchResultsController: nil)
super.init()
searchController.searchResultsUpdater = self
searchController.hidesNavigationBarDuringPresentation = true
searchController.obscuresBackgroundDuringPresentation = false
self.searchController.searchBar.text = self.text
self.subscription = self.text.publisher.sink { _ in
self.searchController.searchBar.text = self.text
}
}
deinit {
self.subscription?.cancel()
}
func updateSearchResults(for searchController: UISearchController) {
guard let text = searchController.searchBar.text else { return }
self.text = text
}
}
class SearchBarWrapperController: UIViewController {
var searchController: UISearchController? {
didSet {
self.parent?.navigationItem.searchController = searchController
}
}
override func viewWillAppear(_ animated: Bool) {
self.parent?.navigationItem.searchController = searchController
}
override func viewDidAppear(_ animated: Bool) {
self.parent?.navigationItem.searchController = searchController
}
}
}
If anyone has a solution to this problem that would be greatly appreciated! I know that in IoS 15 they are bringing out .searchable but looking for something that will work for earlier versions too.
You can put any control in the position you want by using the .toolbar modifier (iOS 14+) and an item with .principal placement, e.g.:
var body: some View {
VStack {
// rest of view
}
.toolbar {
ToolbarItem(placement: .principal) {
MySearchField(text: $searchText)
}
}
}
A couple of things to note:
The principal position overrides an inline navigation title, either when it's set with .navigationBarTitleDisplayMode(.inline) or when you have a large title and scroll up the page.
It's possible that your custom view expands horizontally so much that the back button loses any text component. Here, I used a TextField to illustrate the point:
You might be able to mitigate for that by assigning a maximum width with .frame(maxWidth:), but at the very least it's something to be aware of.
Related
Repost question from this Adjust View up with Keyboard show in SwiftUI 3.0 iOS15.
SwiftUI keyboard avoidance won't show the whole textfield including the overlay.
I already tried a lot different ways from googling.
Does anyone have any solution for this?
struct ContentView: View {
#State var text: String = ""
var body: some View {
ScrollView {
VStack {
Spacer(minLength: 600)
TextField("Placeholder", text: $text)
.textFieldStyle(CustomTextFieldStyle())
}
}
}
}
struct CustomTextFieldStyle: TextFieldStyle {
func _body(configuration: TextField<Self._Label>) -> some View {
configuration
.padding(10)
.overlay(
RoundedRectangle(cornerRadius: 20)
.stroke(Color.red, lineWidth: 5)
)
}
}
You can write the custom UITextFeild, in which the intrinsicContentSize will be overridden.
Example:
final class _UITextField: UITextField {
override var intrinsicContentSize: CGSize {
CGSize(width: UIView.noIntrinsicMetric, height: 56)
}
}
Then, you can write your own implementation of TextField, using UIViewRepresentable protocol and UITextFieldDelegate:
struct _TextField: UIViewRepresentable {
private let title: String?
#Binding var text: String
let textField = _UITextField()
init(
_ title: String?,
text: Binding<String>
) {
self.title = title
self._text = text
}
func makeCoordinator() -> _TextFieldCoordinator {
_TextFieldCoordinator(self)
}
func makeUIView(context: Context) -> _UITextField {
textField.placeholder = title
textField.delegate = context.coordinator
return textField
}
func updateUIView(_ uiView: _UITextField, context: Context) {}
}
final class _TextFieldCoordinator: NSObject, UITextFieldDelegate {
private let control: _TextField
init(_ control: _TextField) {
self.control = control
super.init()
control.textField.addTarget(self, action: #selector(textFieldEditingChanged), for: .editingChanged)
}
#objc private func textFieldEditingChanged(_ textField: UITextField) {
control.text = textField.text ?? ""
}
}
I found an integration of the uiSearchController in SwiftUI, but I don't know how to let it become active?
I found this:
I want that the searchBar becomes active when changing an Bool in the SwiftUI View with a #State for example.
If I add a Binding to the view modifier and set the isActive property of the searchController in
ViewControllerResolver { viewController in
viewController.navigationItem.searchController = self.searchBar.searchController
viewController.navigationItem.hidesSearchBarWhenScrolling = false
}
then is doesn't become active.
Im not really familiar with UIKit, perhaps anybody knows how to correctly activate the searchbar that one can start typing for a search.
class SearchBar: NSObject, ObservableObject {
#Published var text: String = ""
let searchController: UISearchController = UISearchController(searchResultsController: nil)
override init() {
super.init()
self.searchController.obscuresBackgroundDuringPresentation = false
self.searchController.searchResultsUpdater = self
}
}
extension SearchBar: UISearchResultsUpdating {
func updateSearchResults(for searchController: UISearchController) {
// Publish search bar text changes.
if let searchBarText = searchController.searchBar.text {
self.text = searchBarText
}
}
}
final class ViewControllerResolver: UIViewControllerRepresentable {
let onResolve: (UIViewController) -> Void
init(onResolve: #escaping (UIViewController) -> Void) {
self.onResolve = onResolve
}
func makeUIViewController(context: Context) -> ParentResolverViewController {
ParentResolverViewController(onResolve: onResolve)
}
func updateUIViewController(_ uiViewController: ParentResolverViewController, context: Context) {
}
}
class ParentResolverViewController: UIViewController {
let onResolve: (UIViewController) -> Void
init(onResolve: #escaping (UIViewController) -> Void) {
self.onResolve = onResolve
super.init(nibName: nil, bundle: nil)
}
required init?(coder: NSCoder) {
fatalError("Use init(onResolve:) to instantiate ParentResolverViewController.")
}
override func didMove(toParent parent: UIViewController?) {
super.didMove(toParent: parent)
if let parent = parent {
onResolve(parent)
}
}
}
struct SearchBarModifier: ViewModifier {
let searchBar: SearchBar
func body(content: Content) -> some View {
content
.overlay(
ViewControllerResolver { viewController in
viewController.navigationItem.searchController = self.searchBar.searchController
viewController.navigationItem.hidesSearchBarWhenScrolling = false
}
.frame(width: 0, height: 0)
)
}
}
extension View {
func add(_ searchBar: SearchBar) -> some View {
return self.modifier(SearchBarModifier(searchBar: searchBar))
}
}
To activate a UISearchBar (which is what you're using), just do:
searchController.searchBar.becomeFirstResponder()
(from this answer)
Now all we need to do is reference searchController.searchBar from the SwiftUI view. First, add a function to your SearchBar class.
class SearchBar: NSObject, ObservableObject {
#Published var text: String = ""
let searchController: UISearchController = UISearchController(searchResultsController: nil)
override init() {
super.init()
self.searchController.obscuresBackgroundDuringPresentation = false
self.searchController.searchResultsUpdater = self
}
/// add this function
func activate() {
searchController.searchBar.becomeFirstResponder()
}
}
Then, just call it. I think this is better than setting a #State, but if you require that, let me know and I'll edit my answer.
struct ContentView: View {
#StateObject var searchBar = SearchBar()
var body: some View {
NavigationView {
Button(action: {
searchBar.activate() /// activate the search bar
}) {
Text("Activate search bar")
}
.modifier(SearchBarModifier(searchBar: searchBar))
.navigationTitle("Navigation View")
}
}
}
Result:
I have a swiftUI view with navigation links that when i click will navigate to another view . The issue is the second view navigationBa button title still has the title of the previous view instead of a logical back title . How i can have the title as Back with changing the title as "Back" in the first view .
First view navigationBar code: The second view just shows the news website in a WebView.
.navigationBarTitle("Breaking News")
The way i tried is changing the title to this:
.navigationBarTitle("Back")
This will work but the title of the first view changes to "Back" Instead of "Breaking News"
Is there any way i can fix this
An alternative approach is to hide the back button and create your own back button like this:
struct ContentView: View {
var body: some View {
NavigationView {
NavigationLink(destination : SomeView()) {
Text("Open")
}
.navigationBarTitle("Breaking News")
}
}
}
// Use navigationBarItems for creating your own bar item.
struct SomeView : View {
#Environment(\.presentationMode) var mode
var body : some View {
Text("Hello, World!")
.navigationBarBackButtonHidden(true)
.navigationBarItems(leading:
Button(action : {
self.mode.wrappedValue.dismiss()
}){
Text("\(Image(systemName: "chevron.left"))Back")
})
}
}
The accepted answer looks glitchy, it removes a lot of standard behaviour and animations, including long press gesture.
Consider using custom backBarButtonTitle modifier:
struct FirstView: View {
var body: some View {
Text("First view")
.backBarButtonTitle("Back")
}
}
It sets the backButtonTitle property to the topmost UINavigationItem in stack. Be sure to use this modifier on the view, whose title you want to change, see documentation.
Here is the implementation of the backBarButtonTitle:
import SwiftUI
import UIKit
extension View {
func backBarButtonTitle(_ title: String) -> some View {
modifier(BackButtonModifier(title: title))
}
}
// MARK: - BackButtonModifier
struct BackButtonModifier: ViewModifier {
let title: String
func body(content: Content) -> some View {
content.background(BackButtonTitleView(title: title))
}
}
// MARK: - BackButtonTitleView
private struct BackButtonTitleView: UIViewRepresentable {
let title: String
func makeUIView(context _: Context) -> BackButtonTitleUIView {
BackButtonTitleUIView(title: title)
}
func updateUIView(_: BackButtonTitleUIView, context _: Context) {}
}
// MARK: - BackButtonTitleUIView
private final class BackButtonTitleUIView: UIView {
// MARK: Lifecycle
init(title: String) {
self.title = title
super.init(frame: .zero)
}
required init?(coder _: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
// MARK: Internal
override func layoutSubviews() {
super.layoutSubviews()
if didConfigureTitle {
return
}
let topNavigationItem = searchNavigationController(currentResponder: self)?
.topViewController?
.navigationItem
if let topNavigationItem {
topNavigationItem.backButtonTitle = title
didConfigureTitle = true
}
}
// MARK: Private
private let title: String
private var didConfigureTitle = false
private func searchNavigationController(currentResponder: UIResponder) -> UINavigationController? {
if let navigationController = currentResponder as? UINavigationController {
return navigationController
} else if let nextResponder = currentResponder.next {
return searchNavigationController(currentResponder: nextResponder)
} else {
return nil
}
}
}
Context
I have created a UIViewRepresentable to wrap a UITextField so that:
it can be set it to become the first responder when the view loads.
the next textfield can be set to become the first responder when enter is pressed
Problem
When used inside a NavigationView, unless the keyboard is dismissed from previous views, the view doesn't observe the value in their ObservedObject.
Question
Why is this happening? What can I do to fix this behaviour?
Screenshots
Keyboard from root view not dismissed:
Keyboard from root view dismissed:
Code
Here is the said UIViewRepresentable
struct SimplifiedFocusableTextField: UIViewRepresentable {
#Binding var text: String
private var isResponder: Binding<Bool>?
private var placeholder: String
private var tag: Int
public init(
_ placeholder: String = "",
text: Binding<String>,
isResponder: Binding<Bool>? = nil,
tag: Int = 0
) {
self._text = text
self.placeholder = placeholder
self.isResponder = isResponder
self.tag = tag
}
func makeUIView(context: UIViewRepresentableContext<SimplifiedFocusableTextField>) -> UITextField {
// create textfield
let textField = UITextField()
// set delegate
textField.delegate = context.coordinator
// configure textfield
textField.placeholder = placeholder
textField.setContentHuggingPriority(.defaultHigh, for: .vertical)
textField.setContentCompressionResistancePriority(.defaultLow, for: .horizontal)
textField.tag = self.tag
// return
return textField
}
func makeCoordinator() -> SimplifiedFocusableTextField.Coordinator {
return Coordinator(text: $text, isResponder: self.isResponder)
}
func updateUIView(_ uiView: UITextField, context: UIViewRepresentableContext<SimplifiedFocusableTextField>) {
// update text
uiView.text = text
// set first responder ONCE
if self.isResponder?.wrappedValue == true && !uiView.isFirstResponder && !context.coordinator.didBecomeFirstResponder{
uiView.becomeFirstResponder()
context.coordinator.didBecomeFirstResponder = true
}
}
class Coordinator: NSObject, UITextFieldDelegate {
#Binding var text: String
private var isResponder: Binding<Bool>?
var didBecomeFirstResponder = false
init(text: Binding<String>, isResponder: Binding<Bool>?) {
_text = text
self.isResponder = isResponder
}
func textFieldDidChangeSelection(_ textField: UITextField) {
text = textField.text ?? ""
}
func textFieldDidBeginEditing(_ textField: UITextField) {
DispatchQueue.main.async {
self.isResponder?.wrappedValue = true
}
}
func textFieldDidEndEditing(_ textField: UITextField) {
DispatchQueue.main.async {
self.isResponder?.wrappedValue = false
}
}
}
}
And to reproduce, here is the contentView:
struct ContentView: View {
var body: some View {
return NavigationView { FieldView(tag: 0) }
}
}
and here's the view with the field and its view model
struct FieldView: View {
#ObservedObject private var viewModel = FieldViewModel()
#State private var focus = false
var tag: Int
var body: some View {
return VStack {
// listen to viewModel's value
Text(viewModel.value)
// text field
SimplifiedFocusableTextField("placeholder", text: self.$viewModel.value, isResponder: $focus, tag: self.tag)
// push to stack
NavigationLink(destination: FieldView(tag: self.tag + 1)) {
Text("Continue")
}
// dummy for tapping to dismiss keyboard
Color.green
}
.onAppear {
self.focus = true
}.dismissKeyboardOnTap()
}
}
public extension View {
func dismissKeyboardOnTap() -> some View {
modifier(DismissKeyboardOnTap())
}
}
public struct DismissKeyboardOnTap: ViewModifier {
public func body(content: Content) -> some View {
return content.gesture(tapGesture)
}
private var tapGesture: some Gesture {
TapGesture().onEnded(endEditing)
}
private func endEditing() {
UIApplication.shared.connectedScenes
.filter {$0.activationState == .foregroundActive}
.map {$0 as? UIWindowScene}
.compactMap({$0})
.first?.windows
.filter {$0.isKeyWindow}
.first?.endEditing(true)
}
}
class FieldViewModel: ObservableObject {
var subscriptions = Set<AnyCancellable>()
// diplays
#Published var value = ""
}
It looks like SwiftUI rendering engine again over-optimized...
Here is fixed part - just make destination unique forcefully using .id. Tested with Xcode 11.4 / iOS 13.4
NavigationLink(destination: FieldView(tag: self.tag + 1).id(UUID())) {
Text("Continue")
}
I am trying to implement a button that presents another scene with a "Slide from Botton" animation.
PresentationButton looked like a good candidate, so I gave it a try:
import SwiftUI
struct ContentView : View {
var body: some View {
NavigationView {
PresentationButton(destination: Green().frame(width: 1000.0)) {
Text("Click")
}.navigationBarTitle(Text("Navigation"))
}
}
}
#if DEBUG
struct ContentView_Previews : PreviewProvider {
static var previews: some View {
Group {
ContentView()
.previewDevice("iPhone X")
.colorScheme(.dark)
ContentView()
.colorScheme(.dark)
.previewDevice("iPad Pro (12.9-inch) (3rd generation)"
)
}
}
}
#endif
And here is the result:
I want the green view to cover the whole screen, and also the modal to be not "draggable to close".
Is it possible to add modifier to PresentationButton to make it full screen, and not draggable?
I have also tried a Navigation Button, but:
- It doesn't "slide from bottom"
- It creates a "back button" on detail view, which I don't want
thanks!
Unfortunately, as of Beta 2 Beta 3, this is not possible in pure SwiftUI. You can see that Modal has no parameters for anything like UIModalPresentationStyle.fullScreen. Likewise for PresentationButton.
I suggest filing a radar.
The nearest you can currently do is something like:
#State var showModal: Bool = false
var body: some View {
NavigationView {
Button(action: {
self.showModal = true
}) {
Text("Tap me!")
}
}
.navigationBarTitle(Text("Navigation!"))
.overlay(self.showModal ? Color.green : nil)
}
Of course, from there you can add whatever transition you like in the overlay.
Although my other answer is currently correct, people probably want to be able to do this now. We can use the Environment to pass a view controller to children. Gist here
struct ViewControllerHolder {
weak var value: UIViewController?
}
struct ViewControllerKey: EnvironmentKey {
static var defaultValue: ViewControllerHolder { return ViewControllerHolder(value: UIApplication.shared.windows.first?.rootViewController ) }
}
extension EnvironmentValues {
var viewController: UIViewControllerHolder {
get { return self[ViewControllerKey.self] }
set { self[ViewControllerKey.self] = newValue }
}
}
Add an extension to UIViewController
extension UIViewController {
func present<Content: View>(style: UIModalPresentationStyle = .automatic, #ViewBuilder builder: () -> Content) {
// Must instantiate HostingController with some sort of view...
let toPresent = UIHostingController(rootView: AnyView(EmptyView()))
toPresent.modalPresentationStyle = style
// ... but then we can reset rootView to include the environment
toPresent.rootView = AnyView(
builder()
.environment(\.viewController, ViewControllerHolder(value: toPresent))
)
self.present(toPresent, animated: true, completion: nil)
}
}
And whenever we need it, use it:
struct MyView: View {
#Environment(\.viewController) private var viewControllerHolder: ViewControllerHolder
private var viewController: UIViewController? {
self.viewControllerHolder.value
}
var body: some View {
Button(action: {
self.viewController?.present(style: .fullScreen) {
MyView()
}
}) {
Text("Present me!")
}
}
}
[EDIT] Although it would be preferable to do something like #Environment(\.viewController) var viewController: UIViewController? this leads to a retain cycle. Therefore, you need to use the holder.
Xcode 12.0 - SwiftUI 2 - iOS 14
Now possible. Use fullScreenCover() modifier.
var body: some View {
Button("Present!") {
self.isPresented.toggle()
}
.fullScreenCover(isPresented: $isPresented, content: FullScreenModalView.init)
}
Hacking With Swift
This version fixes the compile error present in XCode 11.1 as well as ensures that controller is presented in the style that is passed in.
import SwiftUI
struct ViewControllerHolder {
weak var value: UIViewController?
}
struct ViewControllerKey: EnvironmentKey {
static var defaultValue: ViewControllerHolder {
return ViewControllerHolder(value: UIApplication.shared.windows.first?.rootViewController)
}
}
extension EnvironmentValues {
var viewController: UIViewController? {
get { return self[ViewControllerKey.self].value }
set { self[ViewControllerKey.self].value = newValue }
}
}
extension UIViewController {
func present<Content: View>(style: UIModalPresentationStyle = .automatic, #ViewBuilder builder: () -> Content) {
let toPresent = UIHostingController(rootView: AnyView(EmptyView()))
toPresent.modalPresentationStyle = style
toPresent.rootView = AnyView(
builder()
.environment(\.viewController, toPresent)
)
self.present(toPresent, animated: true, completion: nil)
}
}
To use this version, the code is unchanged from the previous version.
struct MyView: View {
#Environment(\.viewController) private var viewControllerHolder: UIViewController?
private var viewController: UIViewController? {
self.viewControllerHolder.value
}
var body: some View {
Button(action: {
self.viewController?.present(style: .fullScreen) {
MyView()
}
}) {
Text("Present me!")
}
}
}
My solution for this (which you can easily extend to allow other params on the presented sheets to be tweaked) is to just subclass UIHostingController
//HSHostingController.swift
import Foundation
import SwiftUI
class HSHostingControllerParams {
static var nextModalPresentationStyle:UIModalPresentationStyle?
}
class HSHostingController<Content> : UIHostingController<Content> where Content : View {
override func present(_ viewControllerToPresent: UIViewController, animated flag: Bool, completion: (() -> Void)? = nil) {
if let nextStyle = HSHostingControllerParams.nextModalPresentationStyle {
viewControllerToPresent.modalPresentationStyle = nextStyle
HSHostingControllerParams.nextModalPresentationStyle = nil
}
super.present(viewControllerToPresent, animated: flag, completion: completion)
}
}
use HSHostingController instead of UIHostingController in your scene delegate
like so:
// Use a HSHostingController as window root view controller.
if let windowScene = scene as? UIWindowScene {
let window = UIWindow(windowScene: windowScene)
//This is the only change from the standard boilerplate
window.rootViewController = HSHostingController(rootView: contentView)
self.window = window
window.makeKeyAndVisible()
}
then just tell the HSHostingControllerParams class what presentation style you want before triggering a sheet
.navigationBarItems(trailing:
HStack {
Button("About") {
HSHostingControllerParams.nextModalPresentationStyle = .fullScreen
self.showMenuSheet.toggle()
}
}
)
Passing the params via the class singleton feels a little 'dirty', but in practice - you would have to create a pretty obscure scenario for this not to work as expected.
You could mess around with environment variables and the like (as other answers have done) - but to me, the added complication isn't worth the purity.
update: see this gist for extended solution with additional capabilities
So I was struggling with that and I didn't like the overlay feature nor the ViewController wrapped version since it gave me some memory bug and I am very new to iOS and only know SwiftUI and no UIKit.
I developed credits the following with just SwiftUI which is probably what an overlay does but for my purposes it is much more flexible:
struct FullscreenModalView<Presenting, Content>: View where Presenting: View, Content: View {
#Binding var isShowing: Bool
let parent: () -> Presenting
let content: () -> Content
#inlinable public init(isShowing: Binding<Bool>, parent: #escaping () -> Presenting, #ViewBuilder content: #escaping () -> Content) {
self._isShowing = isShowing
self.parent = parent
self.content = content
}
var body: some View {
GeometryReader { geometry in
ZStack {
self.parent().zIndex(0)
if self.$isShowing.wrappedValue {
self.content()
.background(Color.primary.colorInvert())
.edgesIgnoringSafeArea(.all)
.frame(width: geometry.size.width, height: geometry.size.height)
.transition(.move(edge: .bottom))
.zIndex(1)
}
}
}
}
}
Adding an extension to View:
extension View {
func modal<Content>(isShowing: Binding<Bool>, #ViewBuilder content: #escaping () -> Content) -> some View where Content: View {
FullscreenModalView(isShowing: isShowing, parent: { self }, content: content)
}
}
Usage:
Use a custom view and pass the showModal variable as a Binding<Bool> to dismiss the modal from the view itself.
struct ContentView : View {
#State private var showModal: Bool = false
var body: some View {
ZStack {
Button(action: {
withAnimation {
self.showModal.toggle()
}
}, label: {
HStack{
Image(systemName: "eye.fill")
Text("Calibrate")
}
.frame(width: 220, height: 120)
})
}
.modal(isShowing: self.$showModal, content: {
Text("Hallo")
})
}
}
I hope this helps!
Greetings krjw