getting names displaying from firebase - ios

Question

I am trying to display the contents of a firebase database. I know that I am reading them correctly as I am able to print them as they are read in. The problem is when I call the method to display them on screen, they are "out of range".
I know this means the the methods are being called simultaneously therefore the array is empty. I have tried the "Sleep()" method and doesn't work.
//arrays of names and descriptions
var Names:[String] = []
var Desctiptions: [String] = []
inital method
override func viewDidLoad() {
super.viewDidLoad()
getRestauraunt()
//create slides
scrollView.delegate = self
slides = createSlides()
setupSlideScrollView(slides: slides)
}
func getRestauraunt(){
let db = Firestore.firestore()
db.collection("Test").getDocuments { (snapshot, err) in
if let err = err {
print("Error getting documents: \(err)")
} else {
for document in snapshot!.documents {
let name = document.get("Name") as! String
let description = document.get("Description") as! String
//print("Names: ",name," Description: ",description)
self.Names.append(name)
self.Desctiptions.append(description)
}
}
}
}
create slides method
func createSlides() -> [Slide] {
//firebase link
let slide1:Slide = Bundle.main.loadNibNamed("Slide", owner: self, options: nil)?.first as! Slide
slide1.labelTitle.text = Names[0]
}
I would like if someone could show me how to get the 'createSlides()' method to wait until the 'getRestauraunts()' method has finished. Thank you

Answer 1

Just call it from the end of the getrestaurant()'s getDocuments closure
func getRestauraunt(){
//as before...
} else {
for document in snapshot!.documents {
let name = document.get("Name") as! String
let description = document.get("Description") as! String
self.Names.append(name)
self.Desctiptions.append(description)
}
self.createSlides()
}
}
}
As an aside, it might also be worth creating a simple Document struct with name and description properties, and just having the one array: [Document]