When I try to run my code I had an error in my app file for missing arguments for parameters in ContentView. Therefore I fixed this issue by entering arguments for the parameters.

Here is what I did (which resolved my previous error):

@main
struct Market_ExampleApp: App {

    @StateObject var appModel: AppViewModel = .init()
    @StateObject var sharedData: SharedDataModel = SharedDataModel()
    @Binding var shirtData : Shirt
    @Binding var showDetailShirt: Bool
    @Binding var trouserData : Trouser
    @Binding var showDetailTrouser: Bool

    init(shirtData: Binding<Shirt>, showDetailShirt: Binding<Bool>, trouserData: Binding<Trouser>, showDetailTrouser: Binding<Bool>){
        self._shirtData = shirtData
        self._showDetailShirt = showDetailShirt
        self._trouserData = trouserData
        self._showDetailTrouser = showDetailTrouser

        UITabBar.appearance().isHidden = true
    }
    
    // Calling Delegate...
    @UIApplicationDelegateAdaptor(Appdelegate.self) var delegate
    var body: some Scene {
        WindowGroup {
            ContentView(shirtData: $shirtData, showDetailShirt: $showDetailShirt, trouserData: $trouserData, showDetailTrouser: $showDetailTrouser)
                .onOpenURL(perform: { url in
                    
                    Auth.auth().canHandle(url)
                })
        }
    }
}

When I made these changes, it resolved the previous error. However now I get the error:

Type 'Market_ExampleApp' does not conform to protocol 'App'

Originally I thought an init was required for the app protocol and tried this method but it didn't work.

ContentView:

import SwiftUI

struct ContentView: View {
  
    @AppStorage("log_status") var log_Status: Bool = false
    @StateObject var appModel: AppViewModel = .init()
    
    @StateObject var sharedData: SharedDataModel = SharedDataModel()
    
    @Binding var shirtData : Shirt
    @Binding var showDetailShirt: Bool

    @Binding var trouserData : Trouser
    @Binding var showDetailTrouser: Bool
    
    init(shirtData: Binding<Shirt>, showDetailShirt: Binding<Bool>, trouserData: Binding<Trouser>, showDetailTrouser: Binding<Bool>){
        self._shirtData = shirtData
        self._showDetailShirt = showDetailShirt
        self._trouserData = trouserData
        self._showDetailTrouser = showDetailTrouser
        
        UITabBar.appearance().isHidden = true
    }
    
    var body: some View {
        Group{
            if log_Status{
                MainPage(shirtData: $shirtData, showDetailShirt: $showDetailShirt, trouserData: $trouserData, showDetailTrouser: $showDetailTrouser)
            }
            else{
                OnBoardingPage()
            }
        }
    }
}

MainPage code:

    @Binding var shirtData : Shirt
    @Binding var showDetailShirt: Bool

    @Binding var trouserData : Trouser
    @Binding var showDetailTrouser: Bool

    @Namespace var animation
    
    // Hiding Tab Bar...
    init(shirtData: Binding<Shirt>, showDetailShirt: Binding<Bool>, trouserData: Binding<Trouser>, showDetailTrouser: Binding<Bool>){
        self._shirtData = shirtData
        self._showDetailShirt = showDetailShirt
        self._trouserData = trouserData
        self._showDetailTrouser = showDetailTrouser
        
        UITabBar.appearance().isHidden = true
    }

Struct for Shirt:

import SwiftUI
import FirebaseFirestoreSwift
import Firebase

struct Shirt: Identifiable, Codable {
    
    @DocumentID var id: String?
    var shirt_name: String = ""
    var shirt_type: String = ""
    var shirt_image: String = ""
    var shirt_uid : String = ""
    var shirt_stock: Int = 0
}

Struct for Trouser:

import SwiftUI
import FirebaseFirestoreSwift
import Firebase

struct Trouser: Identifiable, Codable {
    
    @DocumentID var id: String?
    var trouser_name: String = ""
    var trouser_type: String = ""
    var trouser_image: String = ""
    var trouser_uid : String = ""
}

MarketplaceShirtView (when a shirt is tapped it should take user to a detailed view). The code for MarketplaceTrouserView is identical

import SwiftUI

struct MarketplaceShirtView: View {
    
    @EnvironmentObject var appModel: AppViewModel
    @StateObject var MarketplaceModel = MarketplaceViewModel()
    @State private var selectedMarketplaceFilter: MarketplaceFilterViewModel = .shirt
    @Namespace var animation : Namespace.ID 
    @State var showDetailShirt = false
    @State var selectedShirt : Shirt!
    
    @EnvironmentObject var sharedData: SharedDataModel
    
    var body: some View {
        
        var columns = Array(repeating: GridItem(.flexible()), count: 2)
        
        ZStack{
            
            VStack(spacing: 10){
                                
                
                HStack {
                    
                    Text("Find Shirts To Buy")
                        
                    }
                
                 }
            }
                
                if MarketplaceModel.shirts.isEmpty{
                    
                    ProgressView()
                   
                }
                else{
                    
                    ScrollView {
                        

                        LazyVGrid(columns: Array(repeating: GridItem(){
                            
                            ForEach(MarketplaceModel.filteredShirt){shirt in
                                                                
                                    ShirtView(shirtData: shirt)

                                        .onTapGesture {
                                            
                                                selectedShirt = shirt
                                                showDetailShirt.toggle()
     
                                        }
                            }
                        }
                    })
                }
            }
            
            if selectedShirt != nil && showDetailShirt{
                
                ShirtDetailView(shirtData: Binding($selectedShirt)!, showDetailShirt: $showDetailShirt,animation: _animation)
            }
}
}

Errors occur when ShirtDetailView is called. The errors are :

Cannot convert value '$showDetailShirt' of type 'Binding' to expected type 'Bool', use wrapped value instead

Cannot convert value of type 'Binding' to expected argument type 'Shirt'

CodePudding user response：

App() is the main component which starts running everything.

You can't have @Binding Variable in App, it will cause an error

App does not conform to protocol App