Блог

Я пытаюсь создать второй отказоустойчивый удобный инициализатор для использования, потому что я хочу выполнить два вызова API, и этот второй отказоустойчивый инициализатор содержит все свойства, которые я получу из исходного API, в отличие от первого отказоустойчивого инициализатора, который будет содержать все исходные свойства плюс несколько дополнительных, которые я добавил, для которых я добавлюбудет публикация в firebase.

 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
    }
}
  

К сожалению, я получаю сообщение об ошибке с указанием:

«self» используется перед вызовом self.init.

И если я попытаюсь просто использовать self.init() , я получу сообщение об ошибке:

Невозможно вызвать ‘Alcohol.init’ без аргументов.

Любая помощь или предложения будут высоко оценены.

В Swift 3 инициализатор удобства должен вызвать назначенный инициализатор в том же классе, прежде чем будет предпринята какая-либо попытка доступа self в инициализаторе удобства.

Я предлагаю вам изменить свой удобный инициализатор таким образом:

 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)
}
  

Обратите внимание, что вам не нужно вызывать self.init... внутри guard .