@propertyWrapper
struct Setting<Value> {
    let key: String
    let defaultValue: Value

    init(withKey key: String, defaultValue: Value) {
        self.key = key
        self.defaultValue = defaultValue
    }

    var wrappedValue: Value {
        set {
            UserDefaults.standard.set(newValue, forKey: key)
        }
        get {
            return UserDefaults.standard.object(forKey: key) as? Value ?? defaultValue
        }
    }
}