I hope you can help.
I'm trying to implement a drag and drop of plain text in SwiftUI on iOS 14.
The text is being dragged from a browser and dropped onto a TextEditor. The text is being dragged ok and it appears in the TextEditor when dropped, but the delegate function is not being called.
If you have any ideas or where I can look for an answer, I'd be very appreciative.
My code is basically this:
import SwiftUI
struct ContentView: View {
#State private var entityText = ""
var body: some View {
VStack(alignment: .leading) {
TextEditor(text: $entityText)
.onDrop(of: [.text], delegate: MyDropDelegate())
.border(Color.black, width: 1)
.padding( 60.0)
}
}
}
struct MyDropDelegate: DropDelegate {
init() {
print("*** INIT ")
}
func performDrop(info: DropInfo) -> Bool {
print("*** Dropped \(info)")
guard info.hasItemsConforming(to: [.text]) else {
return false
}
return true
}
func validateDrop(info: DropInfo) -> Bool {
print("*** Validate")
return info.hasItemsConforming(to: [.text])
}
func dropEntered(info: DropInfo) {
print("*** ENTERED")
}
}
As Adam mentioned in a comment, the TextEditor might conflict. But the Delegate should be set to self or an observable object. You're instantiating something for a parameter that expects a reference.
Related
I have new SwiftUI .keyboard toolbar added. And it works great with Swiftui TextFields. But I consider if it is possible and how can it be done to use this toolbar also with UITextFields wrapped in UIViewRepresentable. I don’t know if I am doing something wrong or this isn’t supported.
I had the same problem and couldn't find an answer, so I tried to recreate this keyboard toolbar in SwiftUI. Here is the code:
struct SomeView: View {
#State var text = ""
#State var focusedUITextField = false
var body: some View {
NavigationStack {
ZStack {
VStack {
Button("Remove UITextField focus") {
focusedUITextField = false
}
TextField("SwiftUI", text: $text)
CustomTextField(hint: "UIKit", text: $text, focused: $focusedUITextField)
.fixedSize(horizontal: false, vertical: true)
}
.padding(.horizontal)
if focusedUITextField {
VStack(spacing: 0) {
Spacer()
Divider()
keyboardToolbarContent
.frame(maxWidth: .infinity, maxHeight: 44)
.background(Color(UIColor.secondarySystemBackground))
}
}
}
/*
.toolbar {
ToolbarItem(placement: .keyboard) {
keyboardToolbarContent
}
}
*/
}
}
var keyboardToolbarContent: some View {
HStack {
Rectangle()
.foregroundColor(.red)
.frame(width: 50, height: 40)
Text("SwiftUI stuff")
}
}
}
And for the custom UITextField:
struct CustomTextField: UIViewRepresentable {
let hint: String
#Binding var text: String
#Binding var focused: Bool
func makeUIView(context: Context) -> UITextField {
let uiTextField = UITextField()
uiTextField.delegate = context.coordinator
uiTextField.placeholder = hint
return uiTextField
}
func updateUIView(_ uiTextField: UITextField, context: Context) {
uiTextField.text = text
uiTextField.placeholder = hint
if focused {
uiTextField.becomeFirstResponder()
} else {
uiTextField.resignFirstResponder()
}
}
func makeCoordinator() -> Coordinator {
return Coordinator(parent: self)
}
class Coordinator: NSObject, UITextFieldDelegate {
let parent: CustomTextField
init(parent: CustomTextField) {
self.parent = parent
}
func textFieldDidBeginEditing(_ textField: UITextField) {
parent.focused = true
}
func textFieldDidEndEditing(_ textField: UITextField) {
parent.focused = false
}
}
}
Unfortunately the animation of the custom toolbar and the keyboard don't match perfectly. I would challenge the guy in the comments from this post How to add a keyboard toolbar in SwiftUI that remains even when keyboard not visible but sadly I can't comment.
Also the background color doesn't match the native toolbar exactly, I don't know which color is used there.
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.
I would like to pass an evaluating function as a parameter to a custom component but it is not working. I am not sure if I should create a custom closure. Would love to hear your thoughts. Here is the code:
#State private var selectedBeautyFilter: BeautyLUT
...
CheckmarkView(isChecked: (selectedView == .none) ? true : false)
PS I am able to get the code working by just using a if..else statement but I insert CheckmarkView component twice (one for isChecked true and another one false)
Cheers
You can use any function for print("Hello 1") or print("Hello 2") it is just for showing, for example like this: customFunction = yourCustomFunctionName in this example I send a custom function to a View. Even you can do same thing to send a function to another function no big issue, all possible.
import SwiftUI
struct ContentView: View {
#State private var customFunction: (() -> Void)?
var body: some View {
Spacer()
Button("send func 1") {
customFunction = { print("Hello 1") }
}
.padding()
Button("send func 2") {
customFunction = { print("Hello 2") }
}
.padding()
Spacer()
CustomView(customFunction: $customFunction)
Spacer()
}
}
struct CustomView: View {
#Binding var customFunction: (() -> Void)?
var body: some View {
Button("run incoming func") {
if let unwrappedFuc = customFunction { unwrappedFuc() } else { print("No function send!")}
}
.padding()
}
}
if I set a custom Back Button (which everyone wants, hiding the ugly text ;-) ) and using .navigationBarBackButtonHidden, the standard Swipe Back gesture on the navigation controller does not work. Is there a way to get this back and having a custom back button?
For Example:
NavigationView {
NavigationLink(destination: DummyViewer())
{
Text("Go to next view"
}
}
struct DummyViewer: View {
#Environment(\.presentationMode) var presentationMode: Binding<PresentationMode>
var body: some View {
Text("Hello, World!").navigationBarBackButtonHidden(true)
.navigationBarItems(leading:
Button(action: { self.presentationMode.wrappedValue.dismiss()}) {
Text("Custom go back")
}
)
}
}
If I do so, I cannot swipe back to the previous view, seems the gesture is then disabled... How to get it back?
BR
Steffen
Nothing I found about creating a custom NavigationView worked but I found that by extending UINavigationController I was able to have a custom back button and the swipe back gesture.
extension UINavigationController: UIGestureRecognizerDelegate {
override open func viewDidLoad() {
super.viewDidLoad()
interactivePopGestureRecognizer?.delegate = self
}
public func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
return viewControllers.count > 1
}
}
I would like to integrate the answer given by Nick Bellucci to make the code also works in other circumstances, e.g. when the child view of the NavigationView is a ScrollView, or a View that is listening for Drag gestures.
extension UINavigationController: UIGestureRecognizerDelegate {
override open func viewDidLoad() {
super.viewDidLoad()
interactivePopGestureRecognizer?.delegate = self
}
public func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
return viewControllers.count > 1
}
// To make it works also with ScrollView
public func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
true
}
}
I've just created a hack which will not animate view but it works
extension View {
func onBackSwipe(perform action: #escaping () -> Void) -> some View {
gesture(
DragGesture()
.onEnded({ value in
if value.startLocation.x < 50 && value.translation.width > 80 {
action()
}
})
)
}
}
Usage
struct TestView: View {
#Environment (\.presentationMode) var mode
var body: some View {
VStack {
Color.red
}
.onBackSwipe {
mode.wrappedValue.dismiss()
}
}
}
You can set the title to an empty string. So back bar button title will be empty:
struct ContentView: View {
var body: some View {
NavigationView {
NavigationLink(destination: Text("Here you are")) {
Text("Next").navigationBarTitle("")
}
}
}
}
You can set the title onAppear or onDisappear if you need to.
If it's still actual, here I answered, how to set custom back button and save swipe back gesture.
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