How to create a custom UIPickerView to connect to UITextField in Swift

Question

I was triyng to create a custom UIPickerView bacause I will need many different custom PickerViews to connect to my one UIViewController.

I create the following code:

let estadosArray = ["AC","AL","AP","AM","BA","CE","ES","GO","MA","MT","MS","MG","PA","PB","PR","PE","PI","RJ","RN","RS","RO","RR","SC","SP","SE","TO","DF"]

class EstadosPickerView: UIViewController {

let myTextField: UITextField
var myPickerView: UIPickerView = UIPickerView()

init(ufExpedicaoTextField: UITextField) {
    self.myTextField = ufExpedicaoTextField
    myTextField.inputView = myPickerView
    super.init(nibName: nil, bundle: nil)
}

required init?(coder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
}

}


extension EstadosPickerView: UIPickerViewDelegate, UIPickerViewDataSource {

func numberOfComponents(in pickerView: UIPickerView) -> Int {
    return 1
}

func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    return estadosArray.count
}

func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
    return estadosArray[row]
}
    
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
    myTextField.text = estadosArray[row]
    myTextField.resignFirstResponder()
}

}

When I click on the UITextField on my UIViewController, the UIPickerView appears, but it doesn't show any data. It's empty.

What is wrong with my code that doesn't show any data?

Answer 1

Perhaps you forget about definition dataSource and delegate for the picker

class EstadosPickerView: UIViewController {
....
    override func viewDidLoad() {
        super.viewDidLoad()
        myPickerView.delegate = self
        myPickerView.dataSource = self
    }
}