便利なイニシャライザを使用して2番目のfiableイニシャライザを作成する

Question

2つのAPIコールを作成し、この2番目の使用可能なイニシャライザに元のAPIから取得するすべてのプロパティが含まれているため、すべてのオリジナルのプロパティと、追加したいくつかの追加プロパティを含む最初のFABLEイニシャライザとは異なり、Firebaseに投稿する予定です。

class Alcohol { 
    var id: Int 
    var companyName: String 
    var address: String 
    var city: String 
    var state: String 
    var postal: String 
    var country: String 
    var phone: String 
    var email: String 
    var url: String 
    var checkedBy: String 
    var notes: String 
    var status: String 
    var statusColor: String 
    var identifier: NSUUID? 
    var barnivoreChecked: Bool? 
    var alcoholType: AlcoholType? 

    // This failable init is for the information I'll be retrieving from firebase. 

    init?(dictionary: [String: AnyObject], type: AlcoholType) { 
     guard 
      let id = dictionary[Constants.kID] as? Int, 
      let companyName = dictionary[Constants.kCompanyName] as? String, 
      let address = dictionary[Constants.kAddress] as? String, 
      let city = dictionary[Constants.kCity] as? String, 
      let state = dictionary[Constants.kState] as? String, 
      let postal = dictionary[Constants.kPostal] as? String, 
      let country = dictionary[Constants.kCountry] as? String, 
      let phone = dictionary[Constants.kPhone] as? String, 
      let email = dictionary[Constants.kEmail] as? String, 
      let url = dictionary[Constants.kURL] as? String, 
      let checkedBy = dictionary[Constants.kCheckedBy] as? String, 
      let notes = dictionary[Constants.kNotes] as? String, 
      let status = dictionary[Constants.kStatus] as? String, 
      let statusColor = dictionary[Constants.kStatusColor] as? String, 
      let barnivoreChecked = dictionary[Constants.kBarnivoreChecked] as? Bool else { return nil } 

     self.id = id 
     self.companyName = companyName 
     self.address = address 
     self.city = city 
     self.state = state 
     self.postal = postal 
     self.country = country 
     self.phone = phone 
     self.email = email 
     self.url = url 
     self.checkedBy = checkedBy 
     self.notes = notes 
     self.status = status 
     self.statusColor = statusColor 
     self.barnivoreChecked = barnivoreChecked 
     self.alcoholType = type 
    } 

    // This failable initializer has all the original properties I want to get from the initial API which I'll be retrieving the information from. 

    convenience init?(barnivoreDictionary: [String: AnyObject]) { 
     guard 
      let id = barnivoreDictionary[Constants.kID] as? Int, 
      let companyName = barnivoreDictionary[Constants.kCompanyName] as? String, 
      let address = barnivoreDictionary[Constants.kAddress] as? String, 
      let city = barnivoreDictionary[Constants.kCity] as? String, 
      let state = barnivoreDictionary[Constants.kState] as? String, 
      let postal = barnivoreDictionary[Constants.kPostal] as? String, 
      let country = barnivoreDictionary[Constants.kCountry] as? String, 
      let phone = barnivoreDictionary[Constants.kPhone] as? String, 
      let email = barnivoreDictionary[Constants.kEmail] as? String, 
      let url = barnivoreDictionary[Constants.kURL] as? String, 
      let checkedBy = barnivoreDictionary[Constants.kCheckedBy] as? String, 
      let notes = barnivoreDictionary[Constants.kNotes] as? String, 
      let status = barnivoreDictionary[Constants.kStatus] as? String, 
      let statusColor = barnivoreDictionary[Constants.kStatusColor] as? String else { 
       self.init(id: 0, companyName: "", address: "", city: "", state: "", postal: "", country: "", phone: "", email: "", url: "", checkedBy: "", notes: "", status: "", statusColor: "", alcoholType: alcoholType!) 
       return nil 
     } 

     self.id = id 
     self.companyName = companyName 
     self.address = address 
     self.city = city 
     self.state = state 
     self.postal = postal 
     self.country = country 
     self.phone = phone 
     self.email = email 
     self.url = url 
     self.checkedBy = checkedBy 
     self.notes = notes 
     self.status = status 
     self.statusColor = statusColor 
     self.alcoholType = nil 
    } 

    init(id: Int, companyName: String, address: String, city: String, state: String, postal: String, country: String, phone: String, email: String, url: String, checkedBy:String, notes: String, status: String, statusColor: String, barnivoreChecked: Bool = true, alcoholType: AlcoholType) { 

     self.id = id 
     self.companyName = companyName 
     self.address = address 
     self.city = city 
     self.state = state 
     self.postal = postal 
     self.country = country 
     self.phone = phone 
     self.email = email 
     self.url = url 
     self.checkedBy = checkedBy 
     self.notes = notes 
     self.status = status 
     self.statusColor = statusColor 
     self.identifier = NSUUID() 
     self.barnivoreChecked = barnivoreChecked 
     self.alcoholType = alcoholType 
    } 
} 

残念ながら、私はというエラーを取得：

"self" used before self.init call.

をそして私はちょうどself.init()を使用しようとするならば、私はエラーを取得：

Cannot invoke 'Alcohol.init' with no arguments.

すべてのヘルプや提案くらいだろう感謝。

Answer 1

Swift 3では、簡易イニシャライザでselfにアクセスしようとする前に、簡易初期化子が同じクラスの指定された初期化子を呼び出す必要があります。

私はあなたがこのようになり便利に初期化子を変更提案：あなたはguard内self.init...を呼び出す必要はありません

convenience init?(barnivoreDictionary: [String: AnyObject]) { 
    guard 
     let id = barnivoreDictionary[Constants.kID] as? Int, 
     let companyName = barnivoreDictionary[Constants.kCompanyName] as? String, 
     let address = barnivoreDictionary[Constants.kAddress] as? String, 
     let city = barnivoreDictionary[Constants.kCity] as? String, 
     let state = barnivoreDictionary[Constants.kState] as? String, 
     let postal = barnivoreDictionary[Constants.kPostal] as? String, 
     let country = barnivoreDictionary[Constants.kCountry] as? String, 
     let phone = barnivoreDictionary[Constants.kPhone] as? String, 
     let email = barnivoreDictionary[Constants.kEmail] as? String, 
     let url = barnivoreDictionary[Constants.kURL] as? String, 
     let checkedBy = barnivoreDictionary[Constants.kCheckedBy] as? String, 
     let notes = barnivoreDictionary[Constants.kNotes] as? String, 
     let status = barnivoreDictionary[Constants.kStatus] as? String, 
     let statusColor = barnivoreDictionary[Constants.kStatusColor] as? String else { 
      return nil 
    } 

    self.init(id: id, companyName: companyName, address: address, city: city, state: state, postal: postal, country: country, phone: phone, email: email, url: url, checkedBy: checkedBy, notes: notes, status: status, statusColor: statusColor, alcoholType: alcoholType) 
} 

注意。