I am building a info page for my SwiftUI app. One item should open App Store, another mail. I have written UIViewControllerRepresentable for each.
MailView works fine totally. StoreView displays fine, but when pressed on Cancel button, throws exception
"*** Terminating app due to uncaught exception 'SKUnsupportedPresentationException', reason: 'SKStoreProductViewController must be used in a modal view controller'".
MailView goes fine into didFinish delegate method but StoreView does not go into didFinish delegate method, it crashes before going into this didFinish method. What am I doing wrong please?
import SwiftUI
import StoreKit
import MessageUI
struct InfoMoreAppsView: View {
@State var showAppAtStore = false
@State var reportBug = false
@State var result: Result<MFMailComposeResult, Error>? = nil
let otherAppName = "TheoryTest"
var body: some View {
VStack(alignment: .leading){
HStack{
Image(Helper.getOtherAppImageName(otherAppName: otherAppName))
Button(action: { self.showAppAtStore = true }) {
Text(otherAppName)
}
.sheet(isPresented: $showAppAtStore){
StoreView(appID: Helper.getOtherAppID(otherAppName: otherAppName))
}
}
Button(action: { self.reportBug = true }) {
Text("Report a bug")
}
.sheet(isPresented: $reportBug){
MailView(result: self.$result)
}
}
.padding()
.font(.title2)
}
}
struct StoreView: UIViewControllerRepresentable {
let appID: String
@Environment(\.presentationMode) var presentation
class Coordinator: NSObject, SKStoreProductViewControllerDelegate {
@Binding var presentation: PresentationMode
init(presentation: Binding<PresentationMode> ) {
_presentation = presentation
}
private func productViewControllerDidFinish(viewController: SKStoreProductViewController) {
$presentation.wrappedValue.dismiss()
viewController.dismiss(animated: true, completion: nil)
}
}
func makeCoordinator() -> Coordinator {
return Coordinator(presentation: presentation)
}
func makeUIViewController(context: UIViewControllerRepresentableContext<StoreView>) -> SKStoreProductViewController {
let skStoreProductViewController = SKStoreProductViewController()
skStoreProductViewController.delegate = context.coordinator
let parameters = [ SKStoreProductParameterITunesItemIdentifier : appID]
skStoreProductViewController.loadProduct(withParameters: parameters)
return skStoreProductViewController
}
func updateUIViewController(_ uiViewController: SKStoreProductViewController, context: UIViewControllerRepresentableContext<StoreView>) {
}
}
struct MailView: UIViewControllerRepresentable {
@Environment(\.presentationMode) var presentation
@Binding var result: Result<MFMailComposeResult, Error>?
class Coordinator: NSObject, MFMailComposeViewControllerDelegate {
@Binding var presentation: PresentationMode
@Binding var result: Result<MFMailComposeResult, Error>?
init(presentation: Binding<PresentationMode>,
result: Binding<Result<MFMailComposeResult, Error>?>) {
_presentation = presentation
_result = result
}
func mailComposeController(_ controller: MFMailComposeViewController,
didFinishWith result: MFMailComposeResult,
error: Error?) {
defer {
$presentation.wrappedValue.dismiss()
}
guard error == nil else {
self.result = .failure(error!)
return
}
self.result = .success(result)
}
}
func makeCoordinator() -> Coordinator {
return Coordinator(presentation: presentation,
result: $result)
}
func makeUIViewController(context: UIViewControllerRepresentableContext<MailView>) -> MFMailComposeViewController {
let mailComposeViewController = MFMailComposeViewController()
mailComposeViewController.mailComposeDelegate = context.coordinator
mailComposeViewController.setToRecipients([Constants.SUPPORT_EMAIL])
mailComposeViewController.setMessageBody(systemInfo(), isHTML: true)
return mailComposeViewController
}
func systemInfo() -> String {
let device = UIDevice.current
let systemVersion = device.systemVersion
let model = UIDevice.hardwareModel
let mailBody = "Model: " + model + ". OS: " + systemVersion
return mailBody
}
func updateUIViewController(_ uiViewController: MFMailComposeViewController,
context: UIViewControllerRepresentableContext<MailView>) {
}
}