I have tried more than a few ways to convert a view to an image in swift. The one that seems the simplest is Hacking With Swift's implementation. The problem is, it returns a blank image and a not in the console saying "[Snapshotting] View (view) drawing with afterScreenUpdates:YES inside CoreAnimation commit is not supported.
I have also tried getting an image from the current graphics context to no avail. I have put things in DispatchQueue.main.async, no matter what I do, I still don't get an image of the view.
Here is my code:
The View
struct ShareView: View {
#Binding var weightEntries: [WeightEntry]
#ObservedObject var goal: Goal
var settings: Settings
#State var showingShareSheet = false
#Environment(\.dismiss) var dismiss
var body: some View {
...
.sheet(isPresented: $showingShareSheet) {
ShareSheetView(activityItems: [ShareProgressView(weightEntries: weightEntries, goal: goal, settings: settings).snapshot()])
}
}
}
The View Extension
extension View {
func snapshot() -> UIImage {
let controller = UIHostingController(rootView: self)
let view = controller.view
let targetSize = controller.view.intrinsicContentSize
view?.bounds = CGRect(origin: .zero, size: targetSize)
view?.backgroundColor = .clear
let renderer = UIGraphicsImageRenderer(size: targetSize)
return renderer.image { _ in
view?.drawHierarchy(in: controller.view.bounds, afterScreenUpdates: true)
}
}
}
The Share Sheet View
struct ShareSheetView: UIViewControllerRepresentable {
typealias Callback = (_ activityType: UIActivity.ActivityType?, _ completed: Bool, _ returnedItems: [Any]?, _ error: Error?) -> Void
let activityItems: [Any]
let applicationActivities: [UIActivity]? = nil
let excludedActivityTypes: [UIActivity.ActivityType]? = nil
let callback: Callback? = nil
func makeUIViewController(context: Context) -> UIActivityViewController {
let controller = UIActivityViewController(
activityItems: activityItems,
applicationActivities: applicationActivities)
controller.excludedActivityTypes = excludedActivityTypes
controller.completionWithItemsHandler = callback
return controller
}
func updateUIViewController(_ uiViewController: UIActivityViewController, context: Context) {
// nothing to do here
}
}
Thank you so much for your help, I really appreciate this especially since I have been stuck on this for a long time now. Have a nice day :)
Related
I have a SwiftUI based app with a simple button that when pressed is supposed to open a Camera Class from AVFoundation that utilizes UIKit as well. Under the sheet I am not sure what exactly to place there. I tried CameraSession() and a few other ideas but I am sort of lost on bridging this SwiftUI button to open camera app. Thank you!
//Content View
import SwiftUI
struct ContentView: View {
//#State private var image: Image?
#State private var showingCameraSession = false
//#Binding var isShown: Bool
var body: some View {
VStack{
ControlButton(systemIconName: "slider.horizontal.3"){
//Button("Seelect Image") {
showingCameraSession = true
} .sheet(isPresented: $showingCameraSession){
//What to place here?
}
}
}
}
//CameraSession
import AVFoundation
//import RealityKit
import UIKit
import SwiftUI
struct CameraSession : UIViewControllerRepresentable {
//#Binding var isShown: Bool
typealias UIViewControllerType = CaptureSession
func makeUIViewController(context: Context) -> CaptureSession{
return CaptureSession()
}
func updateUIViewController(_ uiViewController: CaptureSession, context: Context) {
// if(self.isShown){
//CameraSession.didTapTakePhoto()
// shutterButton.addTarget(self, action: #selector(didTapTakePhoto), for: .touchUpInside) //tie button to actual function
}
}
class CaptureSession: UIViewController {
//#Binding var isShown: Bool
//Reference: https://www.youtube.com/watch?v=ZYPNXLABf3c
//CaptureSession
var session: AVCaptureSession?
//PhotoOutput --> to the Cloud
let output = AVCapturePhotoOutput()
// Video Preview
let previewLayer = AVCaptureVideoPreviewLayer()
//Shutter Button
private let shutterButton: UIButton = {
let button = UIButton(frame: CGRect(x:0, y:0, width: 100, height: 100))
button.layer.cornerRadius = 50
button.layer.borderWidth = 10
button.layer.borderColor = UIColor.white.cgColor
return button
}()
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .black
//previewLayer.backgroundColor = UIColor.systemRed.cgColor
view.layer.addSublayer(previewLayer)
view.addSubview(shutterButton)
checkCameraPermissions()
shutterButton.addTarget(self, action: #selector(didTapTakePhoto), for: .touchUpInside) //tie button to actual function
}
override func viewDidLayoutSubviews(){
super.viewDidLayoutSubviews()
previewLayer.frame = view.bounds
shutterButton.center = CGPoint(x: view.frame.size.width/2, y: view.frame.size.height - 100)
}
private func checkCameraPermissions() {
switch AVCaptureDevice.authorizationStatus(for: .video){
case .notDetermined:
//Request Permission
AVCaptureDevice.requestAccess(for: .video) { [weak self] granted in
guard granted else {
return
}
DispatchQueue.main.async{
self?.setUpCamera()
}
}
case .restricted:
break
case .denied:
break
case .authorized:
setUpCamera()
#unknown default:
break
}
}
//with Photogrammetry, you also have to create a session similar https://developer.apple.com/documentation/realitykit/creating_3d_objects_from_photographs/
// example app: https://developer.apple.com/documentation/realitykit/taking_pictures_for_3d_object_capture
private func setUpCamera(){
let session = AVCaptureSession()
if let device = AVCaptureDevice.default(for: .video){
do{
let input = try AVCaptureDeviceInput(device: device)
if session.canAddInput(input){
session.addInput(input) //some Devices contract each other.
}
if session.canAddOutput(output) {
session.addOutput(output)
}
previewLayer.videoGravity = .resizeAspectFill //content does not get distored or filled
previewLayer.session = session
session.startRunning()
self.session = session
}
catch{
print(error)
}
}
}
//originally private
#objc private func didTapTakePhoto() {
output.capturePhoto(with: AVCapturePhotoSettings(),
delegate: self)
// let vc = UIHostingController(rootView: ContentView())
// present(vc, animated: true)
}
}
//AVCaptureOutput is AVFoundations version of photo output
extension CaptureSession: AVCapturePhotoCaptureDelegate {
func photoOutput( output: AVCaptureOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error:
Error?){
guard let data = photo.fileDataRepresentation() else { //where to store file information
return
}
let image = UIImage(data: data)
session?.stopRunning()
let imageView = UIImageView(image: image)
imageView.contentMode = .scaleAspectFill
imageView.frame = view.bounds
view.addSubview(imageView)
}
}
So to get around this first make your app has permission to access the users camera(go to Info.plist or info tab beside the build settings at the top and add Privacy camera usage and add "We need your camera to perform this action")
After that a simple call in the sheet's modifier should do the trick
struct ContentView: View {
//#State private var image: Image?
#State private var showingCameraSession = false
//#Binding var isShown: Bool
var body: some View {
VStack{
// ControlButton(systemIconName: "slider.horizontal.3"){
Button("Seelect Image") {
showingCameraSession = true
} .sheet(isPresented: $showingCameraSession){
//What to place here?
CameraSession()
}
}
}
}
I've added a UIViewControllerRepresentable for UIKit's QLPreviewController which I've found in a related question:
struct QuickLookView: UIViewControllerRepresentable {
var url: URL
var onDismiss: (() -> Void) = { }
func makeCoordinator() -> Coordinator {
Coordinator(self)
}
func updateUIViewController(_ viewController: UINavigationController, context: UIViewControllerRepresentableContext<Self>) {
(viewController.topViewController as? QLPreviewController)?.reloadData()
}
func makeUIViewController(context: Context) -> UINavigationController {
let controller = QLPreviewController()
controller.dataSource = context.coordinator
controller.reloadData()
return UINavigationController(rootViewController: controller)
}
class Coordinator: NSObject, QLPreviewControllerDataSource {
var parent: QuickLookView
init(_ qlPreviewController: QuickLookView) {
self.parent = qlPreviewController
super.init()
}
func numberOfPreviewItems(in controller: QLPreviewController) -> Int {
1
}
func previewController(_ controller: QLPreviewController, previewItemAt index: Int) -> QLPreviewItem {
self.parent.url as QLPreviewItem
}
}
}
In my app, I download a file (jpg/png/pdf) via Alamofire:
let destination: DownloadRequest.Destination = { _, _ in
let documentsURL = FileManager.default.documentsDirectory
.appendingPathComponent(document.id.string)
.appendingPathComponent(document.name ?? "file.jpg")
return (documentsURL, [.removePreviousFile, .createIntermediateDirectories])
}
AF
.download(url, to: destination)
.responseURL { (response) in
guard let url = response.fileURL else { return }
self.fileURL = url
self.isShowingDoc = true
}
...and pass its local url to the QuickLookView to present it:
#State private var isShowingDoc = false
#State private var fileURL: URL?
var body: some View {
// ...
.sheet(isPresented: $isShowingDoc, onDismiss: { isShowingDoc = false }) {
QuickLookView(url: fileURL!) {
isShowingDoc = false
}
}
}
What happens is that the QuickLookView opens as sheet, the file flashes (is displayed for like 0.1 seconds) and then the view goes blank:
I checked the Documents folder of the app in Finder and the file is there and matches the url passed to the QuickLookView. I've noticed that when the view is open, and I then delete the file from the folder via Finder, then the view will throw an error saying there's no such file – that means it did read it properly before it was deleted.
Note: I read somewhere that the QL controller has had issues when placed inside a navigation controller. In my view hierarchy, my views are embedded inside a NavigationView – might that cause issues?
How do I solve this?
You just need to update the view before presenting the sheet otherwise it wont work. It can be the button title, opacity or anything. Although it looks like a hack it works fine. I will be very glad if someone explains why it happens and if there is a proper way to make it work without updating the view.
import SwiftUI
struct ContentView: View {
#State private var fileURL: URL!
#State private var isDisabled = false
#State private var isDownloadFinished = false
#State private var buttonTitle: String = "Download PDF"
private let url = URL(string: "https://www.dropbox.com/s/bxrhk6194lf0n73/macpro_mid2010-macpro_mid2012.pdf?dl=1")!
var body: some View {
Button(buttonTitle) {
isDisabled = true
buttonTitle = "Downloading..."
URLSession.shared.downloadTask(with: url) { location, response, error in
guard
let location = location, error == nil,
let suggestedFilename = (response as? HTTPURLResponse)?.suggestedFilename,
let documentDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first
else { return }
fileURL = documentDirectory.appendingPathComponent(suggestedFilename)
if !FileManager.default.fileExists(atPath: fileURL.path) {
do {
try FileManager.default.moveItem(at: location, to: fileURL)
} catch {
print(error)
}
}
DispatchQueue.main.async {
isDownloadFinished = true
buttonTitle = "" // you need to change the view prefore presenting the sheet otherwise it wont work
}
}.resume()
}
.disabled(isDisabled == true)
.sheet(isPresented: $isDownloadFinished) {
isDisabled = false
isDownloadFinished = false
fileURL = nil
buttonTitle = "Download PDF"
} content: {
if isDownloadFinished {
PreviewController(previewItems: [PreviewItem(url: fileURL, title: fileURL?.lastPathComponent)], index: 0)
}
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
import SwiftUI
import QuickLook
struct PreviewController: UIViewControllerRepresentable {
var previewItems: [PreviewItem] = []
var index: Int
func makeCoordinator() -> Coordinator { .init(self) }
func updateUIViewController(_ viewController: UINavigationController, context: UIViewControllerRepresentableContext<Self>) {
(viewController.topViewController as? QLPreviewController)?.reloadData()
}
func makeUIViewController(context: Context) -> UINavigationController {
let controller = QLPreviewController()
controller.dataSource = context.coordinator
controller.delegate = context.coordinator
controller.reloadData()
return .init(rootViewController: controller)
}
class Coordinator: NSObject, QLPreviewControllerDataSource, QLPreviewControllerDelegate {
let previewController: PreviewController
init(_ previewController: PreviewController) {
self.previewController = previewController
}
func numberOfPreviewItems(in controller: QLPreviewController) -> Int {
previewController.previewItems.count
}
func previewController(_ controller: QLPreviewController, previewItemAt index: Int) -> QLPreviewItem {
previewController.previewItems[index]
}
}
}
class PreviewItem: NSObject, QLPreviewItem {
var previewItemURL: URL?
var previewItemTitle: String?
init(url: URL? = nil, title: String? = nil) {
previewItemURL = url
previewItemTitle = title
}
}
I finally got it to work – big thanks to Leo Dabus for his help in the comments.
Here's my currently working code:
#State private var isShowingDoc = false
#State private var isLoadingFile = false
#State private var fileURL: URL?
var body: some View {
Button {
let destination: DownloadRequest.Destination = { _, _ in
let documentsURL = FileManager.default.documentsDirectory
.appendingPathComponent(document.id.string)
.appendingPathComponent(document.name ?? "file.jpg")
return (documentsURL, [.removePreviousFile, .createIntermediateDirectories])
}
isLoadingFile = true
AF
.download(url, to: destination)
.responseURL { (response) in
self.isLoadingFile = false
guard let url = response.fileURL else { return }
isShowingDoc = true
self.fileURL = url
}
} label: {
VStack {
Text("download")
if isLoadingFile {
ActivityIndicator(style: .medium)
}
}
}
.sheet(isPresented: $isShowingDoc, onDismiss: { isShowingDoc = false }) {
QuickLookView(url: fileURL!)
}
}
with this QuickLookView: (mostly unchanged)
struct QuickLookView: UIViewControllerRepresentable {
var url: URL
func makeCoordinator() -> Coordinator {
Coordinator(self)
}
func updateUIViewController(_ viewController: UINavigationController, context: UIViewControllerRepresentableContext<Self>) {
(viewController.topViewController as? QLPreviewController)?.reloadData()
}
func makeUIViewController(context: Context) -> UINavigationController {
let controller = QLPreviewController()
controller.dataSource = context.coordinator
controller.reloadData()
return UINavigationController(rootViewController: controller)
}
class Coordinator: NSObject, QLPreviewControllerDataSource {
var parent: QuickLookView
init(_ qlPreviewController: QuickLookView) {
self.parent = qlPreviewController
super.init()
}
func numberOfPreviewItems(in controller: QLPreviewController) -> Int {
1
}
func previewController(_ controller: QLPreviewController, previewItemAt index: Int) -> QLPreviewItem {
self.parent.url as QLPreviewItem
}
}
}
As you can see, there's hardly any difference to my code from when I asked the question. Yesterday night, the fileURL was always nil for an unclear reason; yet, now it started working just fine. In exchange, the remote images in my list (not shown here) stopped working even though I haven't touched them, haha.
I don't know what's going on and what I even changed to make it work, but it works and I won't complain!
I'm having great difficulty working out how to implement a PDFView using UIViewRepresentable.
I understand that I can get variables from SwiftUI -> UIKit via a simple Binding.
I understand that I need to use a Coordinator to detect PDFView Notifications such as PDFViewPageChanged etc and then pass data back with the Binding.
I cant find an example of how you can use Coordinator to pick up notifications. Any help would be greatly appretiated.
Thanks
EDIT
What I've tried - unfortuantly I never recieve a notification
func makeUIView(context: Context) -> PDFView {
let pdfView = PDFView()
pdfView.document = pdfDocument
pdfView.autoScales = true
NotificationCenter.default.publisher(for: .PDFViewPageChanged)
.map {$0.object as? PDFView}
.sink { (view) in
print("notification received")
}
return pdfView
}
Something like this:
struct SPDFView: UIViewRepresentable {
let document: PDFDocument
#Binding var selection: String?
func makeUIView(context: Context) -> PDFView {
let view = PDFView()
view.document = document
NotificationCenter.default.publisher(for: .PDFViewSelectionChanged)
.map { $0.object as? PDFView }
.sink { (view) in
// or do something else
self.selection = view?.currentSelection?.string
}
.store(in: &cancellables)
// or, if you don't want to use Combine:
// NotificationCenter.default.addObserver(forName: .PDFViewSelectionChanged, object: nil, queue: nil) { (notification) in
// guard let pdfView = notification.object as? PDFView else { return }
// self.selection = pdfView.currentSelection?.string
// }
return view
}
func updateUIView(_ uiView: PDFView, context: Context) {}
}
How can I control the preferred presentation size of a modal sheet on iPad with SwiftUI? I'm surprised how hard it is to find an answer on Google for this.
Also, what is the best way to know if the modal is dismissed by dragging it down (cancelled) or actually performing a custom positive action?
Here is my solution for showing a form sheet on an iPad in SwiftUI:
struct MyView: View {
#State var show = false
var body: some View {
Button("Open Sheet") { self.show = true }
.formSheet(isPresented: $show) {
Text("Form Sheet Content")
}
}
}
Enabled by this UIViewControllerRepresentable
class FormSheetWrapper<Content: View>: UIViewController, UIPopoverPresentationControllerDelegate {
var content: () -> Content
var onDismiss: (() -> Void)?
private var hostVC: UIHostingController<Content>?
required init?(coder: NSCoder) { fatalError("") }
init(content: #escaping () -> Content) {
self.content = content
super.init(nibName: nil, bundle: nil)
}
func show() {
guard hostVC == nil else { return }
let vc = UIHostingController(rootView: content())
vc.view.sizeToFit()
vc.preferredContentSize = vc.view.bounds.size
vc.modalPresentationStyle = .formSheet
vc.presentationController?.delegate = self
hostVC = vc
self.present(vc, animated: true, completion: nil)
}
func hide() {
guard let vc = self.hostVC, !vc.isBeingDismissed else { return }
dismiss(animated: true, completion: nil)
hostVC = nil
}
func presentationControllerWillDismiss(_ presentationController: UIPresentationController) {
hostVC = nil
self.onDismiss?()
}
}
struct FormSheet<Content: View> : UIViewControllerRepresentable {
#Binding var show: Bool
let content: () -> Content
func makeUIViewController(context: UIViewControllerRepresentableContext<FormSheet<Content>>) -> FormSheetWrapper<Content> {
let vc = FormSheetWrapper(content: content)
vc.onDismiss = { self.show = false }
return vc
}
func updateUIViewController(_ uiViewController: FormSheetWrapper<Content>,
context: UIViewControllerRepresentableContext<FormSheet<Content>>) {
if show {
uiViewController.show()
}
else {
uiViewController.hide()
}
}
}
extension View {
public func formSheet<Content: View>(isPresented: Binding<Bool>,
#ViewBuilder content: #escaping () -> Content) -> some View {
self.background(FormSheet(show: isPresented,
content: content))
}
}
You should be able to modify the code in func show() according to UIKit specs in order to get the sizing the way you like (and you can even go so far as to inject parameters from the SwiftUI side if needed). This is just how I get a form sheet to work on iPad as .sheet was just too big for my use case
I just posted the same in this SO How can I make a background color with opacity on a Sheet view?
but it seems to do exactly what I need it to do. It makes the background of the sheet transparent while allowing the content to be sized as needed to appear as if it's the only part of the sheet. Works great on the iPad.
Using the AWESOME answer from #Asperi that I have been trying to find all day, I have built a simple view modifier that can now be applied inside a .sheet or .fullScreenCover modal view and provides a transparent background. You can then set the frame modifier for the content as needed to fit the screen without the user having to know the modal is not custom sized.
import SwiftUI
struct ClearBackgroundView: UIViewRepresentable {
func makeUIView(context: Context) -> some UIView {
let view = UIView()
DispatchQueue.main.async {
view.superview?.superview?.backgroundColor = .clear
}
return view
}
func updateUIView(_ uiView: UIViewType, context: Context) {
}
}
struct ClearBackgroundViewModifier: ViewModifier {
func body(content: Content) -> some View {
content
.background(ClearBackgroundView())
}
}
extension View {
func clearModalBackground()->some View {
self.modifier(ClearBackgroundViewModifier())
}
}
Usage:
.sheet(isPresented: $isPresented) {
ContentToDisplay()
.frame(width: 300, height: 400)
.clearModalBackground()
}
In case it helps anyone else, I was able to get this working by leaning on this code to hold the view controller:
https://gist.github.com/timothycosta/a43dfe25f1d8a37c71341a1ebaf82213
struct ViewControllerHolder {
weak var value: UIViewController?
init(_ value: UIViewController?) {
self.value = value
}
}
struct ViewControllerKey: EnvironmentKey {
static var defaultValue: ViewControllerHolder? { ViewControllerHolder(UIApplication.shared.windows.first?.rootViewController) }
}
extension EnvironmentValues {
var viewController: ViewControllerHolder? {
get { self[ViewControllerKey.self] }
set { self[ViewControllerKey.self] = newValue }
}
}
extension UIViewController {
func present<Content: View>(
presentationStyle: UIModalPresentationStyle = .automatic,
transitionStyle _: UIModalTransitionStyle = .coverVertical,
animated: Bool = true,
completion: #escaping () -> Void = { /* nothing by default*/ },
#ViewBuilder builder: () -> Content
) {
let toPresent = UIHostingController(rootView: AnyView(EmptyView()))
toPresent.modalPresentationStyle = presentationStyle
toPresent.rootView = AnyView(
builder()
.environment(\.viewController, ViewControllerHolder(toPresent))
)
if presentationStyle == .overCurrentContext {
toPresent.view.backgroundColor = .clear
}
present(toPresent, animated: animated, completion: completion)
}
}
Coupled with a specialized view to handle common elements in the modal:
struct ModalContentView<Content>: View where Content: View {
// Use this function to provide the content to display and to bring up the modal.
// Currently only the 'formSheet' style has been tested but it should work with any
// modal presentation style from UIKit.
public static func present(_ content: Content, style: UIModalPresentationStyle = .formSheet) {
let modal = ModalContentView(content: content)
// Present ourselves
modal.viewController?.present(presentationStyle: style) {
modal.body
}
}
// Grab the view controller out of the environment.
#Environment(\.viewController) private var viewControllerHolder: ViewControllerHolder?
private var viewController: UIViewController? {
viewControllerHolder?.value
}
// The content to be displayed in the view.
private var content: Content
public var body: some View {
VStack {
/// Some specialized controls, like X button to close omitted...
self.content
}
}
Finally, simply call:
ModalContentView.present( MyAwesomeView() )
to display MyAwesomeView inside of a .formSheet modal.
There are some issues in #ccwasden's answer. Dismissing popover won't change $isPresented all the time, as delegate is not set and hostVC is never assigned.
Here are some modifications required.
In FlexSheetWrapper:
func show() {
guard hostVC == nil else { return }
let vc = UIHostingController(rootView: content())
vc.view.sizeToFit()
vc.preferredContentSize = vc.view.bounds.size
vc.modalPresentationStyle = .formSheet
vc.presentationController?.delegate = self
hostVC = vc
self.present(vc, animated: true, completion: nil)
}
And in FormSheet:
func updateUIViewController(_ uiViewController: FlexSheetWrapper<Content>,
context: UIViewControllerRepresentableContext<FlexSheet<Content>>) {
if show {
uiViewController.show()
}
else {
uiViewController.hide()
}
}
From #ccwasden answer, I fixed the problem when you $isPresented = true at the beginning of code, the modal will not present when the view is loaded, To do so here is code View+FormSheet.swift
Result
// You can now set `test = true` at first
.formSheet(isPresented: $test) {
Text("Hi")
}
View+FormSheet.swift
import SwiftUI
class ModalUIHostingController<Content>: UIHostingController<Content>, UIPopoverPresentationControllerDelegate where Content : View {
var onDismiss: (() -> Void)
required init?(coder: NSCoder) { fatalError("") }
init(onDismiss: #escaping () -> Void, rootView: Content) {
self.onDismiss = onDismiss
super.init(rootView: rootView)
view.sizeToFit()
preferredContentSize = view.bounds.size
modalPresentationStyle = .formSheet
presentationController?.delegate = self
}
func presentationControllerWillDismiss(_ presentationController: UIPresentationController) {
print("modal dismiss")
onDismiss()
}
}
class ModalUIViewController<Content: View>: UIViewController {
var isPresented: Bool
var content: () -> Content
var onDismiss: (() -> Void)
private var hostVC: ModalUIHostingController<Content>
private var isViewDidAppear = false
required init?(coder: NSCoder) { fatalError("") }
init(isPresented: Bool = false, onDismiss: #escaping () -> Void, content: #escaping () -> Content) {
self.isPresented = isPresented
self.onDismiss = onDismiss
self.content = content
self.hostVC = ModalUIHostingController(onDismiss: onDismiss, rootView: content())
super.init(nibName: nil, bundle: nil)
}
func show() {
guard isViewDidAppear else { return }
self.hostVC = ModalUIHostingController(onDismiss: onDismiss, rootView: content())
present(hostVC, animated: true)
}
func hide() {
guard !hostVC.isBeingDismissed else { return }
dismiss(animated: true)
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(true)
isViewDidAppear = true
if isPresented {
show()
}
}
override func viewDidDisappear(_ animated: Bool) {
super.viewDidDisappear(animated)
isViewDidAppear = false
}
override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
super.viewWillTransition(to: size, with: coordinator)
show()
}
}
struct FormSheet<Content: View> : UIViewControllerRepresentable {
#Binding var show: Bool
let content: () -> Content
func makeUIViewController(context: UIViewControllerRepresentableContext<FormSheet<Content>>) -> ModalUIViewController<Content> {
let onDismiss = {
self.show = false
}
let vc = ModalUIViewController(isPresented: show, onDismiss: onDismiss, content: content)
return vc
}
func updateUIViewController(_ uiViewController: ModalUIViewController<Content>,
context: UIViewControllerRepresentableContext<FormSheet<Content>>) {
if show {
uiViewController.show()
}
else {
uiViewController.hide()
}
}
}
extension View {
public func formSheet<Content: View>(isPresented: Binding<Bool>,
#ViewBuilder content: #escaping () -> Content) -> some View {
self.background(FormSheet(show: isPresented,
content: content))
}
}
I'm wondering if there is a good way export or share a file through SwiftUI. There doesn't seem to be a way to wrap a UIActivityViewController and present it directly. I've used the UIViewControllerRepresentable to wrap a UIActivityViewController, and it crashes if I, say, present it in a SwiftUI Modal.
I was able to create a generic UIViewController and then from there call a method that presents the UIActivityViewController, but that's a lot of wrapping.
And if we want to share from the Mac using SwiftUI, is there a way to wrap NSSharingServicePicker?
Anyway, if anyone has an example of how they're doing this, it would be much appreciated.
You can define this function anywhere (preferably in the global scope):
#discardableResult
func share(
items: [Any],
excludedActivityTypes: [UIActivity.ActivityType]? = nil
) -> Bool {
guard let source = UIApplication.shared.windows.last?.rootViewController else {
return false
}
let vc = UIActivityViewController(
activityItems: items,
applicationActivities: nil
)
vc.excludedActivityTypes = excludedActivityTypes
vc.popoverPresentationController?.sourceView = source.view
source.present(vc, animated: true)
return true
}
You can use this function in a button action, or anywhere else needed:
Button(action: {
share(items: ["This is some text"])
}) {
Text("Share")
}
We can call the UIActivityViewController directly from the View (SwiftUI) without using UIViewControllerRepresentable.
import SwiftUI
enum Coordinator {
static func topViewController(_ viewController: UIViewController? = nil) -> UIViewController? {
let vc = viewController ?? UIApplication.shared.windows.first(where: { $0.isKeyWindow })?.rootViewController
if let navigationController = vc as? UINavigationController {
return topViewController(navigationController.topViewController)
} else if let tabBarController = vc as? UITabBarController {
return tabBarController.presentedViewController != nil ? topViewController(tabBarController.presentedViewController) : topViewController(tabBarController.selectedViewController)
} else if let presentedViewController = vc?.presentedViewController {
return topViewController(presentedViewController)
}
return vc
}
}
struct ActivityView: View {
var body: some View {
Button(action: {
self.shareApp()
}) {
Text("Share")
}
}
}
extension ActivityView {
func shareApp() {
let textToShare = "something..."
let activityViewController = UIActivityViewController(activityItems: [textToShare], applicationActivities: nil)
let viewController = Coordinator.topViewController()
activityViewController.popoverPresentationController?.sourceView = viewController?.view
viewController?.present(activityViewController, animated: true, completion: nil)
}
}
struct ActivityView_Previews: PreviewProvider {
static var previews: some View {
ActivityView()
}
}
And this is a preview:
Hoping to help someone!
EDIT: Removed all code and references to UIButton.
Thanks to #Matteo_Pacini for his answer to this question for showing us this technique. As with his answer (and comment), (1) this is rough around the edges and (2) I'm not sure this is how Apple wants us to use UIViewControllerRepresentable and I really hope they provide a better SwiftUI ("SwiftierUI"?) replacement in a future beta.
I put in a lot of work in UIKit because I want this to look good on an iPad, where a sourceView is needed for the popover. The real trick is to display a (SwiftUI) View that gets the UIActivityViewController in the view hierarchy and trigger present from UIKit.
My needs were to present a single image to share, so things are targeted in that direction. Let's say you have an image, stored as a #State variable - in my example the image is called vermont.jpg and yes, things are hard-coded for that.
First, create a UIKit class of type `UIViewController to present the share popover:
class ActivityViewController : UIViewController {
var uiImage:UIImage!
#objc func shareImage() {
let vc = UIActivityViewController(activityItems: [uiImage!], applicationActivities: [])
vc.excludedActivityTypes = [
UIActivity.ActivityType.postToWeibo,
UIActivity.ActivityType.assignToContact,
UIActivity.ActivityType.addToReadingList,
UIActivity.ActivityType.postToVimeo,
UIActivity.ActivityType.postToTencentWeibo
]
present(vc,
animated: true,
completion: nil)
vc.popoverPresentationController?.sourceView = self.view
}
}
The main things are;
You need a "wrapper" UIViewController to be able to present things.
You need var uiImage:UIImage! to set the activityItems.
Next up, wrap this into a UIViewControllerRepresentable:
struct SwiftUIActivityViewController : UIViewControllerRepresentable {
let activityViewController = ActivityViewController()
func makeUIViewController(context: Context) -> ActivityViewController {
activityViewController
}
func updateUIViewController(_ uiViewController: ActivityViewController, context: Context) {
//
}
func shareImage(uiImage: UIImage) {
activityViewController.uiImage = uiImage
activityViewController.shareImage()
}
}
The only two things of note are:
Instantiating ActivityViewController to return it up to ContentView
Creating shareImage(uiImage:UIImage) to call it.
Finally, you have ContentView:
struct ContentView : View {
let activityViewController = SwiftUIActivityViewController()
#State var uiImage = UIImage(named: "vermont.jpg")
var body: some View {
VStack {
Button(action: {
self.activityViewController.shareImage(uiImage: self.uiImage!)
}) {
ZStack {
Image(systemName:"square.and.arrow.up").renderingMode(.original).font(Font.title.weight(.regular))
activityViewController
}
}.frame(width: 60, height: 60).border(Color.black, width: 2, cornerRadius: 2)
Divider()
Image(uiImage: uiImage!)
}
}
}
Note that there's some hard-coding and (ugh) force-unwrapping of uiImage, along with an unnecessary use of #State. These are there because I plan to use `UIImagePickerController next to tie this all together.
The things of note here:
Instantiating SwiftUIActivityViewController, and using shareImage as the Button action.
Using it to also be button display. Don't forget, even a UIViewControllerRepresentable is really just considered a SwiftUI View!
Change the name of the image to one you have in your project, and this should work. You'll get a centered 60x60 button with the image below it.
Most of the solutions here forget to populate the share sheet on the iPad.
So, if you intend to have an application not crashing on this device, you can use
this method where popoverController is used and add your desired activityItems as a parameter.
import SwiftUI
/// Share button to populate on any SwiftUI view.
///
struct ShareButton: View {
/// Your items you want to share to the world.
///
let itemsToShare = ["https://itunes.apple.com/app/id1234"]
var body: some View {
Button(action: { showShareSheet(with: itemsToShare) }) {
Image(systemName: "square.and.arrow.up")
.font(.title2)
.foregroundColor(.blue)
}
}
}
extension View {
/// Show the classic Apple share sheet on iPhone and iPad.
///
func showShareSheet(with activityItems: [Any]) {
guard let source = UIApplication.shared.windows.last?.rootViewController else {
return
}
let activityVC = UIActivityViewController(
activityItems: activityItems,
applicationActivities: nil)
if let popoverController = activityVC.popoverPresentationController {
popoverController.sourceView = source.view
popoverController.sourceRect = CGRect(x: source.view.bounds.midX,
y: source.view.bounds.midY,
width: .zero, height: .zero)
popoverController.permittedArrowDirections = []
}
source.present(activityVC, animated: true)
}
}
Take a look at AlanQuatermain -s SwiftUIShareSheetDemo
In a nutshell it looks like this:
#State private var showShareSheet = false
#State public var sharedItems : [Any] = []
Button(action: {
self.sharedItems = [UIImage(systemName: "house")!]
self.showShareSheet = true
}) {
Text("Share")
}.sheet(isPresented: $showShareSheet) {
ShareSheet(activityItems: self.sharedItems)
}
struct ShareSheet: UIViewControllerRepresentable {
typealias Callback = (_ activityType: UIActivity.ActivityType?, _ completed: Bool, _ returnedItems: [Any]?, _ error: Error?) -> Void
let activityItems: [Any]
let applicationActivities: [UIActivity]? = nil
let excludedActivityTypes: [UIActivity.ActivityType]? = nil
let callback: Callback? = nil
func makeUIViewController(context: Context) -> UIActivityViewController {
let controller = UIActivityViewController(
activityItems: activityItems,
applicationActivities: applicationActivities)
controller.excludedActivityTypes = excludedActivityTypes
controller.completionWithItemsHandler = callback
return controller
}
func updateUIViewController(_ uiViewController: UIActivityViewController, context: Context) {
// nothing to do here
}
}