TextField return nil if never reselected - swift

Question

In my EditVC, I performed segue from selected CellForRow At indexPath to editVC.
In Edit VC. I want to expect results of data return as it is IF there is no modification. However, issue is if I did not rechoose/reselect the row at pickerView again, it will auto return nil.
I want to have results of if User did not modify the data/specific data only, other data will remain the same.
This is the results of print statement.
// This results is perform correctly for what I want IF I RESELECT THE PICKERVIEW IN TEXTFIELD BUT WILL AMEND MY CATEGORY DATABASE AS WELL.
currentTransaction.categoryID : Optional(9)
selectedCategory.categoryID : 9
currentTransaction.categoryTypeID : Optional(1)
selectedCategory.categoryTypeID : 1
currentTransaction.categorytype.name = Optional("EXPENSE 9")
selectedCategory.name = EXPENSE 9
// If I never reselect the pickerview in textfield
currentTransaction.categoryID : Optional(0) /* Suppose to be 9 */
selectedCategory.categoryID : 0 /* Suppose to be 9 */
currentTransaction.categoryTypeID : Optional(0) /* Suppose to be 1 */
selectedCategory.categoryTypeID : 0 /* Suppose to be 1 */
currentTransaction.categoryType.name = Optional("") /* Suppose to be EXPENSE 9 */
selectedCategory.name = /* Suppose to be EXPENSE 9 */
class EditTransactionTableViewController: UITableViewController {
let realm = try! Realm()
var selectedTransaction : Transaction? //selectedTransaction From TransactionVC's CellForRow
var categories : Results<Category>!
var currentCategories : Results<Category>!
var selectedCategory = Category()
#IBOutlet weak var amountTF: UITextField!
//PickerView for keyboard
lazy var pickerView : UIPickerView = UIPickerView()
//Segment Control
#IBOutlet weak var categorySCoutlet: UISegmentedControl!
#IBOutlet weak var categoryTF: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
amountTF.text = selectedTransaction?.amount
categoryTF.text = selectedTransaction?.categoryType?.name
categorySCoutlet.selectedSegmentIndex = selectedTransaction?.categoryType?.categoryTypeID as! Int
loadData()
setupPicker()
}
#IBAction func categoryTypeSC(_ sender: UISegmentedControl) {
guard let type = CategoryType(id: sender.selectedSegmentIndex) else {
fatalError("error")
}
currentCategories = categories.filter("categoryTypeID == %#", type.rawValue)
categoryTF.text = currentCategories.first?.name
pickerView.reloadAllComponents()
// pickerView.selectRow(0, inComponent: 0, animated: true)
}
//MARK:- Edit Transaction Btn
#IBAction func editTransactionButtonTapped(_ sender: UIButton) {
if let currentTransaction = selectedTransaction {
try! realm.write {
currentTransaction.amount = amountTF.text!
//Success modification if got RESELECT row of category BUT will return "" if never reselect and cause categories list become chosen categoryID, name , and type
currentTransaction.categoryType?.categoryID = selectedCategory.categoryID
currentTransaction.categoryType?.categoryTypeID = selectedCategory.categoryTypeID
currentTransaction.categoryType!.name = selectedCategory.name
print("currenttransaction.categoryID : \(currentTransaction.categoryType?.categoryID)")
print("selectedCategory.categoryID : \(selectedCategory.categoryID)")
print("currenttransaction.categoryTypeID : \(currentTransaction.categoryType?.categoryTypeID)")
print("selectedCategory.categoryTypeID : \(selectedCategory.categoryTypeID)")
print("currenttranasction.categorytype.name = \(currentTransaction.categoryType?.name)")
print("selectedcategory.name = \(selectedCategory.name)")
}
}
DataManager.shared.transVC.tableView.reloadData()
dismiss(animated: true, completion: nil)
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
super.touchesBegan(touches, with: event)
if touches.first?.view == view {
categoryTF.resignFirstResponder()
}
}
// MARK: - Data Manipulation
func loadData() {
categories = realm.objects(Category.self)
}
}
//MARK:- UIPICKERVIEW DELEGATE
extension EditTransactionTableViewController : UIPickerViewDelegate, UIPickerViewDataSource {
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return currentCategories.count
}
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return currentCategories[row].name
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
categoryTF.text = currentCategories[row].name
selectedCategory = currentCategories[row]
}
//MARK:- Picker Helper
func setupPicker() {
// currentCategories = categories.filter("categoryTypeID == %#", CategoryType.income.rawValue)
currentCategories = categories.filter("categoryTypeID == %#", selectedTransaction?.categoryType?.categoryTypeID)
categoryTF.inputView = pickerView
pickerView.delegate = self
pickerView.dataSource = self
categorySCoutlet.setTitle("Income", forSegmentAt: 0)
categorySCoutlet.setTitle("Expense", forSegmentAt: 1)
categorySCoutlet.addTarget(self, action: #selector(categoryTypeSC(_:)), for: .valueChanged)
}
}