Nima uchun arxitektura muhim

struct VazifalarKorinishi: View {
    @State private var vazifalar: [String] = []
    @State private var yangiVazifaMatni = ""
    @State private var xatoXabar: String? = nil
    @State private var yuklanmoqda = false

    var body: some View {
        NavigationStack {
            VStack {
                TextField("Yangi vazifa", text: $yangiVazifaMatni)

                Button("Qo'shish") {
                    // Validatsiya logikasi tugma ichida
                    let tozalangan = yangiVazifaMatni.trimmingCharacters(in: .whitespaces)
                    guard !tozalangan.isEmpty else {
                        xatoXabar = "Vazifa bo'sh bo'lishi mumkin emas."
                        return
                    }
                    guard tozalangan.count <= 100 else {
                        xatoXabar = "Vazifa juda uzun."
                        return
                    }
                    // Ma'lumot o'zgarishi ham tugma ichida
                    vazifalar.append(tozalangan)
                    yangiVazifaMatni = ""
                    xatoXabar = nil
                }

                // Filtrlash — ko'rinish ichida ma'lumot almashtirish
                List(vazifalar.filter { filterMatni.isEmpty || $0.localizedCaseInsensitiveContains(filterMatni) }, id: \.self) {
                    Text($0)
                }

                // Tarmoq so'rovi — butunlay boshqa ish, hali viewda
                Button("Serverdan yuklash") {
                    yuklanmoqda = true
                    Task {
                        let url = URL(string: "https://api.example.com/tasks")!
                        let (data, _) = try await URLSession.shared.data(from: url)
                        let decoded = try JSONDecoder().decode([String].self, from: data)
                        vazifalar = decoded
                        yuklanmoqda = false
                    }
                }
            }
        }
    }
}