scope issue in recordFetchedBlock swift - ios

Question

So I have this function, where I am comparing the password user entered(passed in variable 'password') with that available in the database( fetched in variable 'Pwd'). If the condition matches then I want the function to return value 1 else 0.
But I am facing issue with scope of variable. The count has the value 1 inside recordFetchedBlock only. and not outside.Can you suggest how I can make this function return 1 on password matching
func FetchRecords(user_name: String, password: String) -> Int {
let pubData = CKContainer.default().publicCloudDatabase
let predicate = NSPredicate(format: "Username = %#", user_name)
let query = CKQuery(recordType: "Teachers", predicate: predicate)
let operation = CKQueryOperation(query: query)
var Pwd = String()
var count = Int()
operation.recordFetchedBlock = { (record : CKRecord!) in
let Pwd: String = record["Password"] as! String
if Pwd == password{
count=1
}else{
count=0
}
}
operation.queryCompletionBlock = { cursor, error in
}
CKContainer.default().publicCloudDatabase.add(operation)
return count
}

Answer 1

Thanks alot for the help #vadian.
The code got fixed with Completion Handler.
Modified code looks like:
func FetchRecords(user_name: String, pass_word: String, completion: #escaping (Bool)->()) -> Void {
let pubData = CKContainer.default().publicCloudDatabase
let predicate = NSPredicate(format: "Username = %#", user_name)
let query = CKQuery(recordType: "Teachers", predicate: predicate)
let operation = CKQueryOperation(query: query)
operation.desiredKeys = ["Password"]
operation.recordFetchedBlock = { (record) in
if pass_word == (record["Password"] as! String){
print("Checkpoint1")
let flag: Bool = true
completion(flag)
}else{
print("Checkpoint2")
let flag: Bool = false
completion(flag)
}
}
operation.queryCompletionBlock = { [unowned self] (cursor, error) in
DispatchQueue.main.async {
if error == nil {
print("Checkpoint3")
}else{
let ac = UIAlertController(title: "Fetch failed", message: "There was a problem fetching records; please try again: \(error!.localizedDescription)", preferredStyle: .alert)
ac.addAction(UIAlertAction(title: "OK", style: .default))
self.present(ac, animated: true)
}
}
}
CKContainer.default().publicCloudDatabase.add(operation)
print("Checkpoint4")
}