trouble acsessing values from class - swift

Question

i am learning swift atm and the use of classes kept me busy the last two weeks.
thank you for any help
for a project in xcode i created a swift file containing a class that initializes empty strings/arrays of strings.
then a function in that class is retrieving data from google firebase to fill those strings.
than in a viewcontroller class is want to retrieve those two strings. how do it do it right?
so far i tried many different ideas but i either get empty strings (as initialized in the beginning of the class) or i get errors
ideally everytime the viewdidload() (in this case) of the viewcontroller class is called i want it to create an instance of the class with uptodate data.
class RetrieveDatabase {
//static let sharedInstance = RetrieveDatabase()
var allMessages = [[String]]()
var messages = [String]()
var categorieNames = [String]()
func loadGoogleValue() -> (allMessages: [[String]], categorieNames: [String]) {
//this function works, the arrays contain type [string] and string
return (self.allMessages, self.categorieNames)
}
/*
-> i tried initializers in so many variations...
init(allMessages: [[String]], categorieNames: [String]) {
self.allMessages = loadGoogleValue().allMessages
self.categorieNames = loadGoogleValue().categorieNames
messages = []
}
*/
}
here the code from the viewcontroller class:
class SettingsView: UIViewController {
let retrieveDatabase = RetrieveDatabase.//tried everything here, only errors
override func viewDidLoad() {
super.viewDidLoad()
label1.text = retrieveDatabase.categorieNames[0]
}
}

Answer 1

I've simplified your code to something that you can easily try out in a playground. If you start with a working version, perhaps you can see the difference between it and the one that's giving you trouble.
class RetrieveDatabase {
var allMessages = [[String]]()
var messages = [String]()
var categorieNames = [String]()
init() {
messages.append("Hi")
messages.append("Hello")
allMessages.append(messages)
categorieNames.append("SALUTATIONS")
}
func loadGoogleValue() -> (allMessages: [[String]], categorieNames: [String]) {
return (self.allMessages, self.categorieNames)
}
}
class SettingsView {
let retrieveDatabase = RetrieveDatabase()
func caller() {
print(retrieveDatabase.loadGoogleValue().allMessages)
print(retrieveDatabase.loadGoogleValue().categorieNames)
}
}
let test = SettingsView().caller()
Since there's very little difference between what I've done and the code you added in your comment above, I suspect it's something you've left out concerning how strings are added to the arrays.