how to add information in an array with a class Swift - ios

Question

I've got a problem for adding some informations in an array.
My class Flights is define by the following :
class Flight{
let date: String
let type: String
let regi: String
let totalTime: String
let depTime: String
let depPlace: String
let arrTime: String
let arrPlace: String
init(from dat: String, _ typ: String, _ reg: String, _ totaltim: String, _ depTim: String, _ depPlac: String, _ arrTim: String, _ arrPlac: String) {
self.date = dat
self.type = typ
self.regi = reg
self.totalTime = totaltim
self.depTime = depTim
self.depPlace = depPlac
self.arrTime = arrTim
self.arrPlace = arrPlac
}}
In my main code I've got declare my array like this :
var datas: [Flight] = []
And finally I've this code to add some informations coming from firebase :
(I add some comment to show you what print() result)
if let user = Auth.auth().currentUser{
// user is connect
let ref = Database.database().reference()
let userID = Auth.auth().currentUser?.uid
let ev = ref.child("flights").child(userID!)
ev.observe(.childAdded, with: { (snapshot) -> Void in
let flightKey = snapshot.key
ref.child("flights").child(userID!).child(flightKey).observeSingleEvent(of: .value) {(snapshot) in
let value = snapshot.value as? NSDictionary
let date = value?["Date"] as? String ?? "no date"
let type = value?["aircraft-model"] as? String ?? "no type"
let registration = value?["aircraft-registration"] as? String ?? "no callsign"
let totalTime = value?["TOTAL-TIME"] as? String ?? "no total Time"
let deppartTime = value?["departure-time"] as? String ?? "no departure Time"
let deppartPlace = value?["departure-place"] as? String ?? "no departure Place"
let arrivalTime = value?["arrival-time"] as? String ?? "no arrival Time"
let arrivalPlace = value?["arrival-place"] as? String ?? "no arrival Place"
print("Date : \(date) - type : \(type) - registration : \(registration) - Etc ...")// Give me exactly the value I requested
self.datas.append(Flight(from: date, type, registration, totalTime, deppartTime, deppartPlace, arrivalTime, arrivalPlace))
print(self.datas)// Give me "MyProjectName.Flight ...
}
})
}else{
// si non connecté alors DECONNEXION !!!!
fatalError("error ...")
}
So I don't understand why if I print the received value from firebase it work but if I print the array value which is completed by the firebase received value it didn't work ?
Thanks for your help !
Flyer-74

Answer 1

Welcome :)
I think all is as expected and you're just seeing this because Swift doesn't know how to describe your objects.
To fix this, you should implement the CustomStringConvertible protocol in your Flight class (https://developer.apple.com/documentation/swift/customstringconvertible)
So something like
extension Flight: CustomStringConvertible {
var description: String {
var description = ""
description.append("date: \(date)\n")
description.append("type: \(type)\n")
description.append("regi: \(regi)\n")
//and so on
return description
}
}
Should give you what you are looking for.
Hope that helps you

Answer 2

You can try to adopt CustomStringConvertible protocol
class Flight : CustomStringConvertible {
var description: String {
return "\(date) \(type)" // add here any variable you want it to be printed
}
let date: String
let type: String
let regi: String
let totalTime: String
let depTime: String
let depPlace: String
let arrTime: String
let arrPlace: String
init(from dat: String, _ typ: String, _ reg: String, _ totaltim: String, _ depTim: String, _ depPlac: String, _ arrTim: String, _ arrPlac: String) {
self.date = dat
self.type = typ
self.regi = reg
self.totalTime = totaltim
self.depTime = depTim
self.depPlace = depPlac
self.arrTime = arrTim
self.arrPlace = arrPlac
}
}

Answer 3

You could add a custom debug description for your object by adding an extension to Flight, and make it conform to the CustomDebugStringConvertible protocol. Conformance to this protocol requires that you provide a property: var debugDescription: String { get }. Inside this string is where you have full control over the debug values for your custom Object.
extension Flight: CustomDebugStringConvertible {
var debugDescription: String {
return "Date: \(date), Type: \(type), Registartion: \(regi)"
}
}