SKStoreProductViewController must be used in a modal view controller SWIFTUI - swiftui

Question

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>) {
}
}

Answer 1

This isn't very "Swifty" or pretty but I got this to work without crashing by not wrapping the SKStoreProductViewController in a representable.
struct MovieView: View {
var vc:SKStoreProductViewController = SKStoreProductViewController()
var body: some View {
HStack(){
Button(action: {
let params = [
SKStoreProductParameterITunesItemIdentifier:"1179624268",
SKStoreProductParameterAffiliateToken:"11l4Cu",
SKStoreProductParameterCampaignToken:"hype_movie"
] as [String : Any]
// vc!.delegate = self
vc.loadProduct(withParameters: params, completionBlock: { (success,error) -> Void in
UIApplication.shared.windows.first?.rootViewController?.present(vc, animated: true, completion: nil)
})
}) {
HStack {
Image(systemName: "play.fill")
.font(.headline)
}
.padding(EdgeInsets(top: 6, leading:36, bottom: 6, trailing: 36))
.foregroundColor(.white)
.background(Color(red: 29/255, green: 231/255, blue: 130/255))
.cornerRadius(10)
}
Spacer()
}}

Answer 2

Since I was stuck on the same thing. Here is a quick solution I found working.
import StoreKit
import SwiftUI
import UIKit
struct StoreView: UIViewControllerRepresentable {
var dismissHandler: () -> Void
func makeUIViewController(context: UIViewControllerRepresentableContext<StoreView>) -> StoreViewController {
return StoreViewController(coordinator: context.coordinator)
}
func updateUIViewController(_ uiViewController: StoreViewController, context: UIViewControllerRepresentableContext<StoreView>) {
}
public func makeCoordinator() -> StoreViewCoordinator {
.init(dismissHandler: dismissHandler)
}
}
class StoreViewController: UIViewController {
let coordinator: StoreViewCoordinator
var storeController: SKStoreProductViewController?
init(coordinator: StoreViewCoordinator) {
self.coordinator = coordinator
super.init(nibName: nil, bundle: nil)
}
#available(*, unavailable)
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
storeController = SKStoreProductViewController()
storeController?.delegate = coordinator
storeController?.loadProduct(
withParameters: [SKStoreProductParameterITunesItemIdentifier: ******]
)
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
guard let storeController = storeController else {
return
}
present(storeController, animated: true)
}
}
class StoreViewCoordinator: NSObject, SKStoreProductViewControllerDelegate {
private let dismissHandler: () -> Void
init(dismissHandler: #escaping () -> Void) {
self.dismissHandler = dismissHandler
}
func productViewControllerDidFinish(_ viewController: SKStoreProductViewController) {
dismissHandler()
}
}
and then I am using it inside ZStack like:
StoreView(
dismissHandler: { viewStore.send(.setShowingStore(false)) }
)
.isHidden(!viewStore.isShowingStore, remove: true)
I am using TCA, so setting a property will be different in your case