Error adding Firestore documents to Pickerview - ios

Question

I've recently changed a lot on my iOS application and now I got stuck.
I'm trying to insert data from Firestore which looks like this:
So, as you can see I've 6 different names in here.
And here is the code to insert into pickerView.
func getPerson()
{
let authentication = Auth.auth().currentUser?.uid
db.collection("users").document(authentication!).collection("person").getDocuments { (QuerySnapshot, err) in
//If error is not equal to nil
if err != nil
{
print("Error getting documents: \(String(describing: err))");
}
//Succeded
else
{
//For-loop
for _ in QuerySnapshot!.documents
{
//Cleaning the array for the new values
self.personArray.removeAll()
let document = QuerySnapshot!.documents
let data = document.data() //HERE IS THE ERROR
data.forEach { (item) in
if let person1Data = data["name"] as? String
{
self.personArray.append(person1Data)
print(self.personArray)
}
}
}
self.pickerView.reloadAllComponents()
}
}
}
I'm getting the error:
Value of type '[QueryDocumentSnapshot]' has no member 'data'
It used to have QuerySnapshot!.documents.first
but it does not work anymore when I've changed the Firestore data.
Edit:
So. the output is now:
["Joche"] ["Joche", "Joche"] ["Putte"] ["Putte", "Putte"] ["Rebecca"]
["Rebecca", "Rebecca"] ["Fredrik"] ["Fredrik", "Fredrik"] ["Anna"]
["Anna", "Anna"] ["Vickan"] ["Vickan", "Vickan"]
which means it adds everything but x3. How to solve this problem?

Answer 1

data is an instance method of a single QueryDocumentSnapshot not an array , You need
self.personArray.removeAll()
for elem in querySnapshot!.documents {
let data = elem.document.data()
data.forEach {
if let person1Data = $0["name"] as? String {
self.personArray.append(person1Data)
print(self.personArray)
}
}
}