Issue saving PFobjects into an array when using pickerView - swift

Question

i'm relatively new to Swift. I've encountered an issue when using PFQuery in pickerView.
I'm trying to implement a 2 component pickerView as demonstrated below:
Component 0: Component 1
"A": "Altivo", "Altrez"
"B": "Beverly", "Bijou"
Choosing "A" from Component 0 will show "Altivo", "Altrez" in Component 1
The values from Component 1 are queried from Parse by using the value from Component 0
Here's my code:
var condoNameList: [String] = [String]()
var condoPicker = UIPickerView()
var condoAlphabet: [String] = [String]()
private let prefixComponent = 0
private let condoNameComponent = 1
override func viewDidLoad() {
super.viewDidLoad()
condoAlphabet = ["A", "B"]
}
//Start: For condoName picker
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
return 2
}
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
if component == prefixComponent{
return condoAlphabet.count
}else {
return self.condoNameList.count
}
}
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
if component == prefixComponent {
condoNameList.removeAll()
let query = PFQuery(className: "condodirectory")
let selectedalphabet: String = condoAlphabet[row] as String!
query.whereKey("condoName", hasPrefix: selectedalphabet)
query.findObjectsInBackgroundWithBlock{
(objects:[PFObject]?, error:NSError?)->Void in
if error == nil{
for object in objects!{
//print(object)
let condoName:String = object["condoName"] as! String
self.condoNameList.append(condoName)
}
}
//print("condo Name List is \(self.condoNameList)") //Position 1
}
print("condo Name List is \(self.condoNameList)") //Position 2
condoPicker.reloadComponent(condoNameComponent)
condoPicker.selectRow(0, inComponent: condoNameComponent, animated: true)
}
}
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
if component == prefixComponent{
return condoAlphabet[row]
}else {
return self.condoNameList[row]
}
}
The issue is at Position 1, the print function is able to print out the condoNameList but at Position 2 it prints an empty array. As a result, the list for Component 1 is not showing up in the PickerView.
Anyone knows why?
Thanks in advance for the help.

Answer 1

I managed to solve the problem from another thread by using the didset{} method.
var condoNameList: [String] = [] {
didSet {
self.condoNameListTemp = condoNameList
condoName.inputView = condoPicker
condoPicker.reloadAllComponents()
}
}