问在UserDefaults中保存CNContact

EN

struct User {
    var firstName: String = ""
    var lastName: String = ""
    var email: String = ""
    var phoneNumber: String = ""
    var company: String = ""
    var assistantContact: CNContact?

    init(firstName: String, lastName: String, email: String, phoneNumber: String, company: String, assistantContact: CNContact? = nil) {
        self.firstName = firstName
        self.lastName = lastName
        self.email = email
        self.phoneNumber = phoneNumber
        self.company = company
        self.assistantContact = assistantContact
    }

    func encode() -> Dictionary<String, AnyObject> {

        var dictionary : Dictionary = Dictionary<String, AnyObject>()
        dictionary["firstName"] = firstName as AnyObject?
        dictionary["lastName"] = lastName as AnyObject?
        dictionary["email"] = email as AnyObject?
        dictionary["phoneNumber"] = phoneNumber as AnyObject?
        dictionary["company"] = company as AnyObject?
        dictionary["assistantContact"] = assistantContact as AnyObject?
        return dictionary

    }

    init(dictionary: Dictionary<String, AnyObject>) {
        if let firstName = dictionary["firstName"] as? String {
            self.firstName = firstName
        }
        if let lastName = dictionary["lastName"] as? String {
            self.lastName = lastName
        }
        if let email = dictionary["email"] as? String {
            self.email = email
        }
        if let phoneNumber = dictionary["phoneNumber"] as? String {
            self.phoneNumber = phoneNumber
        }
        if let company = dictionary["company"] as? String {
            self.company = company
        }
        if let assistantContact = dictionary["assistantContact"] as? CNContact {
            self.assistantContact = assistantContact
        }
    }

}