retrieve posts / query firebase swift 4 - swift

Question

i am attempting to retrieve a list of Posts ("Planits - in my apps language") from firebase. My goal is to display a specific users posts within a table view on their profile. I have written a function to retrieves posts and query them by a sender ID so that the user see's their posts on their profile. But at the end of the query when i try to print out the appended array, i keep getting an empty array, so i can not go further on to populate the table view. Please any suggestions on where i went wrong, attached is a screen shot of my firebase nodes and the function i wrote. thanks
func retrievePost(){
ref = Database.database().reference()
let myPlanitsRef = self.ref.child("planits")
let query = myPlanitsRef.queryOrdered(byChild: "senderId").queryEqual(toValue: "uid")
print(query)
query.observeSingleEvent(of: .value, with: { (snapshot) in
if snapshot.exists() {
for child in snapshot.children {
let snap = child as! DataSnapshot
print(DataSnapshot.self)
let dict = snap.value as! [String: Any]
let myPostURL = dict["images"] as! String
self.images.append(myPostURL)
}
//print(myPostURL) - DOES NOT PRING ANYTHING
//print(self.images) - DOES NOT PRING ANYTHING
}
}) { (error) in
print(error)
}
}
override func viewDidLoad() {
super.viewDidLoad()
retrievePost()
print(images) // PRINTS []