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SOLVED: Day 77: Challenge -> Unable to save the array of users.

Forums > 100 Days of SwiftUI

Could someone help me understand why my "users" array is coming back empty after I add a "User" to it? Through various print statements, I have come to the conclusion that when I press "save", an instance of "User" is created and appended to the array of Users, however once the sheet is closed, nothing appears in my list and I am back to having an empty array. Also, I know that I say to send back an empty array in my Content View initializer catch statement, however I have tested this, and the catch statement is actually not the reason the array is empty (the do block is not causing any errors).

Also, I know I need to put much of this into separate ViewModels, however I was just planning on moving everything over once I got it working. I also know that there are one or two unrelated mistakes in the code; I was just going to fix those once I figured this out.

Thanks!

Content View:

struct ContentView: View {
    @State private var pic: Image?
    @State private var users = [User]()

    let savePath = FileManager.documentsDirectory.appendingPathComponent("SavedUsers")

    @State private var showingAddNewUser = false

    var body: some View {
        NavigationView {
            List {
                Section("Users") {
                    ForEach(users, id:\.name) { user in
                        HStack {
                            pic?
                                .resizable()
                                .scaledToFit()
                                .frame(width: 100, height: 100)

                            Text(user.name)
                                .font(.headline).fontWeight(.semibold)
                        }
                    }
                }
            }
            .navigationTitle("iFace")
            .toolbar {
                Button {
                    showingAddNewUser = true
                } label: {
                    Image(systemName: "plus")
                }
            }
            .sheet(isPresented: $showingAddNewUser) {
                AddUserView(users: users)
            }

        }
    }

    init() {
            do {
                let userData = try Data(contentsOf: savePath)
                users = try JSONDecoder().decode([User].self, from: userData)

                for user in users {
                    let dataPic = user.pic
                    let uiPic = UIImage(data: dataPic)
                    self.pic = Image(uiImage: uiPic!)
                }
                print(users)
            } catch {
                print(error)
                users = []
            }
        }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

AddUser:

struct AddUserView: View {
    @State private var pic: Image?
    @State private var name = ""
    @State private var showingImagePicker = false
    @State private var inputImage: UIImage?

    @State var users: [User]

    @Environment(\.dismiss) var dismiss

    let savePath = FileManager.documentsDirectory.appendingPathComponent("SavedUsers")

    var body: some View {
        NavigationView {
            Form {
                Section {
                    TextField("Name", text: $name)
                }

                Section {
                    ZStack {
                        Rectangle()
                            .fill(.white)
                            .frame(width: 350, height: 350)

                        Text("Please Select an Image")
                            .fontWeight(.semibold)

                        pic?
                            .resizable()
                            .scaledToFit()
                            .frame(maxWidth: 350, maxHeight: 350)
                    }
                    .onTapGesture {
                        showingImagePicker = true
                    }
                }
            }
            .navigationBarTitle("Add")
            .toolbar {
                Button("Save") {
                    save()
                    dismiss()
                }
            }

        }
        .sheet(isPresented: $showingImagePicker) {
            ImagePicker(image: $inputImage)
        }
        .onChange(of: inputImage) { _ in loadImage() }

    }

    func loadImage() {
        guard let inputImage = inputImage else { return }

        let img = Image(uiImage: inputImage)
        pic = img
    }

    func save() {
        do {
            if let jpegData = inputImage?.jpegData(compressionQuality: 0.8) {
                let newUser = User(id: UUID(), name: name, pic: jpegData)
                users.append(newUser)
                print(newUser)

                let userData = try JSONEncoder().encode(users)
                try userData.write(to: savePath, options: [.atomicWrite, .completeFileProtection])
            }
            print("encoding successful")
            print(users)

        } catch {
            print("encoding error")
        }
        print(users.count)
    }

}

ImagePicker:

struct ImagePicker: UIViewControllerRepresentable {
    @Binding var image: UIImage?

    class Coordinator: NSObject, PHPickerViewControllerDelegate {
        var parent: ImagePicker

        init(parent: ImagePicker) {
            self.parent = parent
        }

        func picker(_ picker: PHPickerViewController, didFinishPicking results: [PHPickerResult]) {
            picker.dismiss(animated: true)

            guard let provider = results.first?.itemProvider else { return }
            if provider.canLoadObject(ofClass: UIImage.self) {
                provider.loadObject(ofClass: UIImage.self) { image, _ in
                    self.parent.image = image as? UIImage
                }
            }
        }
    }

    func makeUIViewController(context: Context) -> PHPickerViewController {
        var config = PHPickerConfiguration()
        config.filter = .images

        let picker = PHPickerViewController(configuration: config)
        picker.delegate = context.coordinator
        return picker
    }

    func updateUIViewController(_ uiViewController: PHPickerViewController, context: Context) { }

    func makeCoordinator() -> Coordinator {
        Coordinator(parent: self)
    }
}

AddUser:

struct User: Identifiable, Codable {
    let id: UUID
    let name: String
    let pic: Data
}

extension User: Comparable {
    static func <(lhs: User, rhs: User) -> Bool {
        lhs.name < rhs.name
    }
}

FileManager Ext:

extension FileManager {
    static var documentsDirectory: URL {
        let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
        return paths[0]
    }
}

2      

Nevermind, I realized I should have been using @Binding instead of @State in the AddUserView.

2      

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