Issue updating UIPickerView in Swift with user inputted data into an array - ios

Question

I'm writing a simple fitness app that allows the user to add user profiles which are displayed in a UIPickerView, and when selected, is entered into the profileField label on the main ViewController. The pickerView uses an array of Profile objects as its data source and displays the name of the profile in the picker. I have it set up to where the user clicks a button on the main ViewController and is segued to the AddProfileViewController where they input the necessary requirements to create a profile. When they hit submit the information successfully gets appended to the profileNames array but the pickerView does not show any changes when the user clicks back on it. I have tried using pickerView.reloadAllComponents() and pickerView.reloadComponent(1) to no success.
I am on Xcode Version 12.4 (12D4e)
class ViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource
{
#IBOutlet weak var profileField: UITextField!
#IBAction func didTapEnter(_ sender: Any)
{
}
#IBAction func didTapNewProfile(_ sender: Any)
{
}
//these are pre-populated values in this array
var profileNames: [Profile] =
[
Profile("Brandon", 2, 120, 20, "Male"),
Profile("G", 2, 100, 20, "Male"),
Profile("K", 1.6, 111, 19, "Male"),
Profile("F", 2.1, 95, 20, "Male"),
Profile("J", 1.89, 97.5, 21, "Male")
]
var pickerView = UIPickerView()
override func viewDidLoad()
{
super.viewDidLoad()
pickerView = UIPickerView()
pickerView.delegate = self
pickerView.dataSource = self
profileField.inputView = pickerView
profileField.textAlignment = .center
profileField.placeholder = "Enter Profile"
}
func numberOfComponents(in pickerView: UIPickerView) -> Int
{
return 1
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int
{
return profileNames.count
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String?
{
return profileNames[row].name
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int)
{
profileField.text = profileNames[row].name
profileField.resignFirstResponder()
}
func profileSubmit(_ data: Profile)
{
profileNames.append(data)
pickerView.reloadComponent(1) //This does not seem to do anything for me
}
}
class AddProfileViewController: UIViewController, UINavigationControllerDelegate
{
#IBOutlet weak var nameTextField: UITextField!
#IBOutlet weak var weightTextField: UITextField!
#IBOutlet weak var heightTextField: UITextField!
#IBOutlet weak var ageTextField: UITextField!
#IBOutlet weak var sexTextField: UITextField!
let main: ViewController? = nil
#IBAction func submit(_ sender: Any)
{
let name = String(nameTextField.text!)
let height = Double(heightTextField.text!)!
let weight = Double(weightTextField.text!)!
let age = Double(ageTextField.text!)!
let sex = String(sexTextField.text!)
let new = Profile.init(name, height, weight, age, sex)
main?.profileSubmit(new)
new.display()
dismiss(animated: true, completion: nil)
}
override func viewDidLoad()
{
super.viewDidLoad()
// Do any additional setup after loading the view.
}
}

Answer 1

I guess that on coming back from newProfile viewDidLoad is called -> you reset the picker in viewDidLoad by setting it to a new instance. Try to remove the new initialization in viewDidLoad :
super.viewDidLoad()
pickerView = UIPickerView()
The picker is already initialized here:
var pickerView = UIPickerView()
Also, I think the picker components start with 0 - so if there is only 1 component it should be:
pickerView.reloadComponent(0)