我正在尝试创建第二个可用的便利初始化程序，因为我想要进行两次API调用，而第二个可用的初始化程序包含我从原始API获得的所有属性，这与第一个可用的初始化程序不同这将包含所有原始属性以及我将添加到firebase上的一些其他属性。
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
}
}
不幸的是我收到错误声明：
＆＃34;自＆＃34;在self.init call之前使用。
如果我尝试使用self.init()，我会收到错误：
无法调用＆＃39; Alcohol.init＆＃39;没有争论。
非常感谢任何帮助或建议。
答案 0 :(得分：1)
在Swift 3中，在方便初始值设定项中尝试访问self之前，便捷初始化程序必须在同一个类中调用指定的初始值设定项。
我建议您将便利初始化程序更改为：
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)
}
请注意，您无需在self.init...内拨打guard。