Question

我正在为我的SwiftUI应用构建信息页面。一个项目应打开App Store，另一邮件。我已经为每个对象编写了UIViewControllerRepresentable。

MailView完全可以正常工作。 StoreView可以正常显示，但是在按“取消”按钮时，会引发异常

“ ***由于未捕获的异常'SKUnsupportedPresentationException'而终止应用程序，原因：'必须在模式视图控制器中使用'SKStoreProductViewController'。

MailView可以很好地使用didFinish委托方法，但StoreView不能使用didFinish委托方法，它在进入didFinish方法之前会崩溃。我在做什么错了？


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

这不是很“Swifty”或漂亮，但我通过不将 SKStoreProductViewController 包装在可表示中来使其正常工作而不会崩溃。

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()
                            }}

SKStoreProductViewController必须在模式视图控制器SWIFTUI中使用

1 个答案: