How to use if/ForEach in a SwiftUI View to show IAP modal?-CodePudding

I'm trying to display a Subscribe Now modal view instantly after the app starts to encourage users to subscribe to the Pro In-App Purchase, so I used the .onAppear modifier, and it works fine only if I want to show the modal every time the app starts.

struct ContentView: View {
    @State private var selection: String? = nil
    @State private var showModal = false
    @ObservedObject var storeManager: StoreManager
        
    var body: some View {
        NavigationView {
            VStack {
                // Contents Here
            }
        }
        .onAppear {
            self.selection = "Pro"
            self.showModal.toggle()
        }
        .sheet(isPresented: $showModal) {
            if self.selection == "Pro" {
                Pro(showModal: self.$showModal, storeManager: self.storeManager)
                    .onAppear(perform: {
                        SKPaymentQueue.default().add(storeManager)
                    })
            }
        }
    }
}

Now, the problem begins when I want to display the modal only to those who have not subscribed yet to the Pro IAP, so I modified .onAppear to:

        .onAppear {
            ForEach(storeManager.myProducts, id: \.self) { product in
                VStack {
                    if !UserDefaults.standard.bool(forKey: product.productIdentifier) {
                        self.selection = "Pro"
                        self.showModal.toggle()
                    }
                }
            }
        }

But, the if and ForEach seems not to work smoothly with structs and views. How should I use them in my case?

CodePudding user response：

You're trying to use View code in onAppear, which doesn't accept a View -- it should just be regular imperative Swift code. So, you likely want something like this:

.onAppear {
  storeManager.myProducts.forEach { product in 
    if !UserDefaults.standard.bool(forKey: product.productIdentifier) {
      self.selection = "Pro"
      self.showModal.toggle() //maybe change this to = true -- toggle could *close* it again if there were multiple items that qualified
    }
  } 
}

CodePudding user response：

be careful, on your .onAppear{}, it should be Swift code instead SwiftUI (ForEach, VStack are view structs)