UICloudSharingController Does not Display/Work with CloudKit App - ios

Question

I have been struggling to get an app to work with CloudKit and record sharing. I have
created several apps that sync Core Data records among devices for one user. I have not
been able to get the UICloudSharingController to work for sharing records. I can display
the Sharing View Controller, but tapping on Mail or Message displays a keyboard but no
address field and no way to dismiss the view. I have been so frustrated by it that I
decided to try the Apple "Sharing" sample app to start from the basics. However, the
sample app does not work for me either.
Here's the link to the sample app:
https://github.com/apple/cloudkit-sample-sharing/tree/swift-concurrency
The code below is pretty much straight from the sample app.
This is the ContentView file:
import SwiftUI
import CloudKit
struct ContentView: View {
#EnvironmentObject private var vm: ViewModel
#State private var isAddingContact = false
#State private var isSharing = false
#State private var isProcessingShare = false
#State private var showShareView = false
#State private var showIntermediateView = false
#State private var activeShare: CKShare?
#State private var activeContainer: CKContainer?
var body: some View {
NavigationView {
contentView
.navigationTitle("Contacts")
.toolbar {
ToolbarItem(placement: .navigationBarLeading) {
Button { Task.init { try await vm.refresh() } } label: { Image(systemName: "arrow.clockwise") }
}
ToolbarItem(placement: .navigationBarLeading) {
progressView
}
ToolbarItem(placement: .navigationBarTrailing) {
Button(action: { isAddingContact = true }) { Image(systemName: "plus") }
}
}
}
.onAppear {
Task.init {
try await vm.initialize()
try await vm.refresh()
}
}
.sheet(isPresented: $isAddingContact, content: {
AddContactView(onAdd: addContact, onCancel: { isAddingContact = false })
})
}
/// This progress view will display when either the ViewModel is loading, or a share is processing.
var progressView: some View {
let showProgress: Bool = {
if case .loading = vm.state {
return true
} else if isProcessingShare {
return true
}
return false
}()
return Group {
if showProgress {
ProgressView()
}
}
}
/// Dynamic view built from ViewModel state.
private var contentView: some View {
Group {
switch vm.state {
case let .loaded(privateContacts, sharedContacts):
List {
Section(header: Text("Private")) {
ForEach(privateContacts) { contactRowView(for: $0) }
}
Section(header: Text("Shared")) {
ForEach(sharedContacts) { contactRowView(for: $0, shareable: false) }
}
}.listStyle(GroupedListStyle())
case .error(let error):
VStack {
Text("An error occurred: \(error.localizedDescription)").padding()
Spacer()
}
case .loading:
VStack { EmptyView() }
}
}
}
/// Builds a `CloudSharingView` with state after processing a share.
private func shareView() -> CloudSharingView? {
guard let share = activeShare, let container = activeContainer else {
return nil
}
return CloudSharingView(container: container, share: share)
}
/// Builds a Contact row view for display contact information in a List.
private func contactRowView(for contact: Contact, shareable: Bool = true) -> some View {
HStack {
VStack(alignment: .leading) {
Text(contact.name)
Text(contact.phoneNumber)
.textContentType(.telephoneNumber)
.font(.footnote)
}
if shareable {
Spacer()
Button(action: { Task.init { try? await shareContact(contact) }
}, label: { Image(systemName: "square.and.arrow.up") }).buttonStyle(BorderlessButtonStyle())
.sheet(isPresented: $isSharing, content: { shareView() })
}//if sharable
}//h
}//contact row view
// MARK: - Actions
private func addContact(name: String, phoneNumber: String) async throws {
try await vm.addContact(name: name, phoneNumber: phoneNumber)
try await vm.refresh()
isAddingContact = false
}
private func shareContact(_ contact: Contact) async throws {
isProcessingShare = true
do {
let (share, container) = try await vm.createShare(contact: contact)
isProcessingShare = false
activeShare = share
activeContainer = container
isSharing = true
} catch {
debugPrint("Error sharing contact record: \(error)")
}
}
}
And the UIViewControllerRepresentable file for the sharing view:
import Foundation
import SwiftUI
import UIKit
import CloudKit
/// This struct wraps a `UIImagePickerController` for use in SwiftUI.
struct CloudSharingView: UIViewControllerRepresentable {
#Environment(\.presentationMode) var presentationMode
let container: CKContainer
let share: CKShare
func updateUIViewController(_ uiViewController: UIViewControllerType, context: Context) {}
func makeUIViewController(context: Context) -> some UIViewController {
let sharingController = UICloudSharingController(share: share, container: container)
sharingController.availablePermissions = [.allowReadWrite, .allowPrivate]
sharingController.delegate = context.coordinator
return sharingController
}
func makeCoordinator() -> CloudSharingView.Coordinator {
Coordinator()
}
final class Coordinator: NSObject, UICloudSharingControllerDelegate {
func cloudSharingController(_ csc: UICloudSharingController, failedToSaveShareWithError error: Error) {
debugPrint("Error saving share: \(error)")
}
func itemTitle(for csc: UICloudSharingController) -> String? {
"Sharing Example"
}
}
}
This is the presented screen when tapping to share a record. This all looks as expected:
This is the screen after tapping Messages (same result for Mail). I don't see any way to influence the second screen presentation - it seems that the view controller representable is not working with this version of Xcode:
Any guidance would be appreciated. Xcode 13.1, iOS 15 and I am on macOS Monterrey.

Answer 1

I had the same issue and fixed it by changing makeUIViewController() in CloudSharingView.swift:
func makeUIViewController(context: Context) -> some UIViewController {
share[CKShare.SystemFieldKey.title] = "Boom"
let sharingController = UICloudSharingController(share: share, container: container)
sharingController.availablePermissions = [.allowReadWrite, .allowPrivate]
sharingController.delegate = context.coordinator
-->>> sharingController.modalPresentationStyle = .none
return sharingController
}
It seems like some value work, some don't. Not sure why.