Saving a list using Codable or userDefaults - swift

Question

Can someone help me to save the list in this code using Codable or another methods. I am not able to use the UserDefaults in the code. Can anyone help me how to use save the lists so that when ever, I re-open my app, the list is still there. Thanks.
import SwiftUI
struct MainView: View {
#State var br = Double()
#State var loadpay = Double()
#State var gp : Double = 0
#State var count: Int = 1
#State var listcheck = Bool()
#StateObject var taskStore = TaskStore()
#State var name = String()
var userCasual = UserDefaults.standard.value(forKey: "userCasual") as? String ?? ""
func addNewToDo() {
taskStore.tasks.append(Task(id: String(taskStore.tasks.count + 1), toDoItem: "load \(count)", amount: Double(gp)))
}
func stepcount() {
count += 1
}
var body: some View {
VStack {
TextField("Name", text: $name)
HStack {
Button(action: { gp += loadpay }) {
Text("Add Load")
}
Button(action: {
addNewToDo()
}) {
Text("Check")
}
}
Form {
ForEach(self.taskStore.tasks) {
task in
Text(task.toDoItem)
}
}
}
Button(action: {
UserDefaults.standard.set(name, forKey: "userCasual")})
{Text("Save")}
}
}
struct Task : Identifiable {
var id = String()
var toDoItem = String()
var amount : Double = 0
}
class TaskStore : ObservableObject {
#Published var tasks = [Task]()
}

Answer 1

In Task adopt Codable
struct Task : Codable, Identifiable {
var id = ""
var toDoItem = ""
var amount = 0.0
}
In TaskStore add two methods to load and save the tasks and an init method
class TaskStore : ObservableObject {
#Published var tasks = [Task]()
init() {
load()
}
func load() {
guard let data = UserDefaults.standard.data(forKey: "tasks"),
let savedTasks = try? JSONDecoder().decode([Task].self, from: data) else { tasks = []; return }
tasks = savedTasks
}
func save() {
do {
let data = try JSONEncoder().encode(tasks)
UserDefaults.standard.set(data, forKey: "tasks")
} catch {
print(error)
}
}
}
In the view call taskStore.save() to save the data.
However: For large data sets UserDefaults is the wrong place. Save the data in the Documents folder or use Core Data.
Side note: Never use value(forKey:) in UserDefaults, in your example there is string(forKey:)

Answer 2

You should take a look at the #AppStorage property wrapper. Here is a great article written by Paul Hudson who is a great resource when you're learning iOS.
UserDefaults isn't the best way to store persistent information though. Once you get a bit more comfortable with Swift and SwiftUI, you should look into CoreData for storing your data across sessions.