KeychainStorageP3.swift

typealias Value = T

    let key: String

    @State private var value: Value?

    init(wrappedValue: Value? = nil, _ key: String) {

        self.key = key

        var initialValue = wrappedValue

        do {

            try Keychain().get(key) { attributes in

                if let attributes = attributes,
                    let data = attributes.data {

                    do {

                        let decoded = try JSONDecoder().decode(Value.self, from: data)
                        initialValue = decoded

                    } catch let error {

                        print("[KeychainStorage] Keychain().get(\(key)) - \(error.localizedDescription)")
                    }
                }
            }
        } catch let error {

            fatalError("\(error)")
        }

        self._value = State<Value?>(initialValue: initialValue)
    }