Why is my app freezing when func is called - swift

Question

Whenever I call this function, my app freezes and nothing in the debug console prints. I am trying to get strings and a double from firebase and then stick them into an identifiable struct array. Any Ideas???
If you have another idea for storing that object, I would love to read it.
var count = Int()
var name = Array<String>()
var imageUrl = Array<String>()
var id = Array<String>()
var rating = Array<Double>()
var url = Array<String>()
var keys = 0
db.collection("parties").document(Utilities.code).addSnapshotListener { document, error in
//check for error
if error == nil {
//check if document exists
print("No error")
if document != nil && document!.exists {
print("Document Exists")
if let array = document!.get("yesName") as? Array<String> {
count = array.count
name = array
print("yesName = \(array)")
keys += 1
}
if let array = document!.get("yesImg") as? Array<String> {
imageUrl = array
print("yesImg = \(array)")
keys += 1
}
if let array = document!.get("yesId") as? Array<String> {
id = array
print("yesId = \(array)")
keys += 1
}
if let array = document!.get("yesRating") as? Array<Double> {
rating = array
print("yesRating = \(array)")
keys += 1
}
if let array = document!.get("yesUrl") as? Array<String> {
url = array
print("yesUrl = \(array)")
keys += 1
}
}
}else {
print("error = \(error!)")
}
}
while keys < 6 {
if name.count > 0 && imageUrl.count > 0 && id.count > 0 && rating.count > 0 && url.count > 0 {
for _ in 0...count {
yes.list.append(RestaurantListViewModel(name: name.first!, imageUrl: URL(string: imageUrl.first!)!, id: id.first!, rating: rating.first!, url: url.first!))
print("combined = \(yes.list.append(RestaurantListViewModel(name: name.first!, imageUrl: URL(string: imageUrl.first!)!, id: id.first!, rating: rating.first!, url: url.first!)))")
name.removeFirst()
imageUrl.removeFirst()
id.removeFirst()
rating.removeFirst()
url.removeFirst()
}
keys = 6
}
}

Answer 1

The snapshot listener will execute asynchronously that means in some time after the current method is finished. So the code after it is called is executed only once and just after listener creation : there is nothing yet in the arrays and keys == 0. May be this code should be inside the listener call after document is read and array updated.

Answer 2

Have you tried to debug while keys < 6 { circle?
Next line condition
if name.count > 0 && imageUrl.count > 0 && id.count > 0 && rating.count > 0 && url.count > 0
can easily equals to false and you get infinity circle running.
Also I see few logic issues in your code: in the first part of code you set up required fields (keys equals in a range from 0 to 6). But in the second part inside circle while keys < 6 you require all 6 fields and want to exit only after all values will have count > 0. You need to get value.count only when it needed.