swift – Syncing Subject Between iOS and WatchOS: SwiftData Not Updating on Watch

I made a decision to start out practising how one can talk knowledge between iOS/iPad and WatchOS. It looks like it’s not syncing accurately as a result of once I add or take away an individual, my watch doesn’t replace. I’ve two watches: one related through Bluetooth and the opposite related through mobile or Wi-Fi. After I create a brand new individual on my iOS app, my WatchOS app doesn’t mirror any adjustments. I’ve 4 individuals in my iOS app, however the WatchOS app reveals an empty database. I’ve tried researching in all places on-line and even consulted AI, however I haven’t been in a position to clear up the difficulty. What might I be doing mistaken, or am I lacking one thing?

iOS App – ContentView.swift

struct ContentView: View {
    @Setting(.modelContext) non-public var modelContext
    
    // Array to carry the individuals for show
    @Question(kind: Individual.title, order: .ahead) non-public var individuals: [Person]
    
    // Add a single random individual
    func addRandomPerson() {
        let names = ["John", "Alice", "Bob", "Charlie", "David", "Emma", "Frank", "Grace", "Hannah", "Isaac"]
        
        // Choose a random title
        let title = names.randomElement()!
        
        // Generate random knowledge for birthday, top, and weight
        let randomBirthday = Date(timeIntervalSince1970: TimeInterval.random(in: 315532800..<(315532800 + (10 * 365 * 24 * 60 * 60)))) // Random yr between 1980 and 1990
        let randomHeight = Double.random(in: 5.5...6.5) // Random top between 5.5 and 6.5 toes
        let randomWeight = Int.random(in: 170...210) // Random weight between 170 and 210 lbs
        
        // Create the brand new individual
        let individual = Individual(title: title,
                            birthday: randomBirthday,
                            top: randomHeight,
                            weight: randomWeight)
        
        // Insert the individual into the mannequin context
        modelContext.insert(individual)
    }
    
    // Delete an individual from the record
    func deletePerson(at offsets: IndexSet) {
        for index in offsets {
            let individual = individuals[index]
            modelContext.delete(individual)
        }
    }
    
    var physique: some View {
        VStack {
            Button("Add Random Individual") {
                addRandomPerson() // Add a single random individual
            }
            .padding()

            Checklist {
                ForEach(individuals) { individual in
                    VStack(alignment: .main) {
                        Textual content(individual.title)
                            .font(.headline)
                        Textual content("Birthday: (individual.birthday.formatted(.dateTime.month().day().yr()))")
                            .font(.subheadline)
                        Textual content("Peak: (individual.top, specifier: "%.1f")")
                        Textual content("Weight: (individual.weight)")
                    }
                    .onTapGesture {
                        // Deal with edit performance if wanted
                    }
                }
                .onDelete(carry out: deletePerson)
            }
        }
        .padding()
    }
}

iOS App – SwiftData.swift

@Mannequin
class Individual {
    var title: String
    var birthday: Date
    var top: Double
    var weight: Int

    init(title: String, birthday: Date, top: Double, weight: Int) {
        self.title = title
        self.birthday = birthday
        self.top = top
        self.weight = weight
    }
}

iOS App – Startup App

@predominant
struct Watch_ConnectionApp: App {
    var physique: some Scene {
        WindowGroup {
            ContentView()
        }
        .modelContainer(for: Individual.self)
    }
}

Watch App – ContentView.swift

struct PersonListView: View {
    @Question(kind: Individual.title, order: .ahead) non-public var individuals: [Person]
    
    public init() { }

    var physique: some View {
        Checklist(individuals) { individual in
            VStack(alignment: .main) {
                Textual content(individual.title)
                    .font(.headline)
                Textual content("Birthday: (individual.birthday.formatted(.dateTime.month().day().yr()))")
                    .font(.subheadline)
                Textual content("Peak: (individual.top, specifier: "%.1f")")
                Textual content("Weight: (individual.weight)")
            }
        }
        .navigationTitle("Folks")
    }
}

Watch App – Startup App

@Mannequin
class Individual {
    var title: String
    var birthday: Date
    var top: Double
    var weight: Int

    init(title: String, birthday: Date, top: Double, weight: Int) {
        self.title = title
        self.birthday = birthday
        self.top = top
        self.weight = weight
    }
}

@predominant
struct Watch_Connection_App_Watch_AppApp: App {
    var physique: some Scene {
        WindowGroup {
            NavigationView {
                PersonListView()
            }
        }
        .modelContainer(for: Individual.self) // Add SwiftData stack
    }
}