Swoft 3 initメソッド。

Question

、Leo Dabusの優れたアドバイスはこちらHow to insert into Sqlite with optional parameters using Swift 3で、オプションのパラメータを許可するようにクラスを変更しました。しかし、私はオブジェクトを初期化するためのJSON文字列を受け入れる便利なメソッド（以下に示す）を持っています。しかし、一番下にあるself.initを見ると、 "！"を追加する必要があります。オプションのパラメータに置き換えます。私が理解するように、これらのパラメータはゼロになる可能性があるため、これは正しくありません。これを処理する良い方法はありますか？ ありがとうございます！

class Address : BaseEntity { 

    var Id: Int 
    var AddressType: Int 
    var AddressStatus: Int 
    var Address1: String 
    var Address2: String 
    var City: String 
    var State: String 
    var Zip: String 
    var Country: String 
    var Latitude: Double 
    var Longitude: Double 

    init(id: Int, addressType: Int, addressStatus: Int, address1: String = "", address2: String = "", city: String = "", state: String = "", zip: String = "", country: String = "", latitude: Double = 0, longitude: Double = 0, isDeleted: Bool, created: Date? = nil, createdBy: Int = 0, modified: Date? = nil, modifiedBy: Int = 0) { 
     self.Id = id 
     self.AddressType = addressType 
     self.AddressStatus = addressStatus 
     self.Address1 = address1 
     self.Address2 = address2 
     self.City = city 
     self.State = state 
     self.Zip = zip 
     self.Country = country 
     self.Latitude = latitude 
     self.Longitude = longitude 
     super.init(isDeleted: isDeleted, created: created, createdBy: createdBy, modified: modified, modifiedBy: modifiedBy) 
    } 

    convenience init?(json: [String: Any]) { 

     guard let id = json["Id"] as? Int, 
      let addressType = json["AddressType"] as? Int, 
      let addressStatus = json["AddressStatus"] as? Int, 
      let isDeleted = json["IsDeleted"] as? Bool 
      else { 
       return nil 
     } 

     let address1 = json["Address1"] as? String 
     let address2 = json["Address2"] as? String 
     let city = json["City"] as? String 
     let state = json["State"] as? String 
     let zip = json["Zip"] as? String 
     let country = json["Country"] as? String 
     let latitude = json["Latitude"] as? Double 
     let longitude = json["Longitude"] as? Double 

     let date = Foundation.Date() 
     let created = date.dateFromJson(json: json["Created"] as? String) 
     let createdBy = json["CreatedBy"] as? Int 
     let modified = date.dateFromJson(json: json["Modified"] as? String) 
     let modifiedBy = json["ModifiedBy"] as? Int 

     self.init(id: id, addressType: addressType, addressStatus: addressStatus, address1: address1!, address2: address2!, city: city!, state: state!, zip: zip!, country: country!, latitude: latitude!, longitude: longitude!, isDeleted: isDeleted, created: created, createdBy: createdBy!, modified: modified, modifiedBy: modifiedBy!) 
    } 
} 

Answer 1

名前付け規則に関する私のコメント以外に、プロパティを変数にする必要はありません。あなたは "??"を見てください。 nil合体オペレータ：

class Address { 
    let id: Int 
    let addressType: Int 
    let addressStatus: Int 
    let address1: String 
    let address2: String 
    let city: String 
    let state: String 
    let zip: String 
    let country: String 
    let latitude: Double? 
    let longitude: Double? 

    init(id: Int, addressType: Int, addressStatus: Int, address1: String = "", address2: String = "", city: String = "", state: String = "", zip: String = "", country: String = "", latitude: Double? = nil, longitude: Double? = nil) { 
     self.id = id 
     self.addressType = addressStatus 
     self.addressStatus = addressStatus 
     self.address1 = address1 
     self.address2 = address2 
     self.city = city 
     self.state = state 
     self.zip = zip 
     self.country = country 
     self.latitude = latitude 
     self.longitude = longitude 
    } 
    init?(json: [String: Any]) { 
     guard 
      let id = json["Id"] as? Int, 
      let addressType = json["AddressType"] as? Int, 
      let addressStatus = json["AddressStatus"] as? Int, 
      let isDeleted = json["IsDeleted"] as? Bool 
      else { 
       return nil 
     } 
     self.id = id 
     self.addressType = addressType 
     self.addressStatus = addressStatus 
     self.address1 = json["Address1"] as? String ?? "" 
     self.address2 = json["Address2"] as? String ?? "" 
     self.city = json["City"] as? String ?? "" 
     self.state = json["State"] as? String ?? "" 
     self.zip = json["Zip"] as? String ?? "" 
     self.country = json["Country"] as? String ?? "" 
     self.latitude = json["Latitude"] as? Double 
     self.longitude = json["Longitude"] as? Double 

     print(isDeleted) 
     // call super.init here 
    } 
} 

let address1 = Address(id: 1, addressType: 2, addressStatus: 3) 
let address2 = Address(id: 2, addressType: 3, addressStatus: 4, address1: "Any Address", latitude: 22.0, longitude: 43.0) // You don't need to add all parameters as long as you keep them in the same order as your initializer 
print(address1.id)   // 1 
print(address1.address1) // "" empty String 
print(address2.latitude ?? "nil") // 22.0 
print(address2.longitude ?? "nil") // 43.0