SOLVED: Unable to Decode From UserDefaults

@SheppyBu

Jul '21

Hi there,

Does anyone know why I am unable to decode an array of 'Habit' in the 'HabitArray' class initialiser?

struct Habit: Identifiable, Codable {
    var id = UUID()
    var name: String
    var timesCompleted: Int
    var description: String
}

class HabitArray: ObservableObject {
    @Published var habitArray = [Habit]() {
        didSet {
            let encoder = JSONEncoder()

            if let encoded = try? encoder.encode(habitArray) {
                UserDefaults.standard.set(encoded, forKey: "HabitArray")
            }
        }
    }

    init() {
        if let items = UserDefaults.standard.data(forKey: "HabitArray") {
            let decoder = JSONDecoder()

            if let decoded = try? decoder.decode([Habit].self, from: habitArray) {
                self.habitArray = decoded
                return
            }
        }

        self.habitArray = []
    }
}

The below code gives me the error message "Cannot convert value of type 'Habit' to expected argument type 'Data'" on the following line:

if let decoded = try? decoder.decode([Habit].self, from: habitArray) {
                self.habitArray = decoded
                return
            }

Thanks

@eoinnorris HWS+

Jul '21

the from: is expecting a data and you are passing it a habitArray. Try items which is the data you got back from the userDefaults.

(although you should rename that to habitArrayData or similar I think)

@SheppyBu

Jul '21

That worked, thank you!

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