【发布时间】：2017-02-12 01:54:07
【问题描述】：
我正在尝试创建第二个可失败的便利初始化程序以使用，因为我想进行两次 API 调用，并且第二个可失败初始化程序包含我将从原始 API 获得的所有属性，这与第一个包含所有属性的可失败初始化程序不同原始属性以及我添加的一些其他属性，我将在这些属性上发布到 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
}
}
很遗憾，我收到一条错误消息：
"self" 在 self.init 调用之前使用。
如果我尝试只使用self.init()，我会收到错误：
不能在没有参数的情况下调用“Alcohol.init”。
任何帮助或建议将不胜感激。
【问题讨论】：
-
使用 super.init()，或者（更好）覆盖 init() { super.init() }
标签： swift initialization