Swift - Programmatically create UIPickerView - ios

Question

I created PickerView, but this does not open the PickerView I created. Where do I make a mistake? Why PickerView doesn't open. I added picker view in the text field but it doesn't work. I added it to viewDidLoad, but when I click a text field, picker view does not open.
class EnergyChart: UIViewController , UIPickerViewDelegate, UIPickerViewDataSource {
var picker = UIPickerView()
var gradePickerValues1 : [String] = ["...", ...]
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return gradePickerValues1.count
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return gradePickerValues1[row]
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int){
getDevice.text = gradePickerValues1[row]
switch row {
case 0: break
default: break
}
self.view.endEditing(true)
}
#objc func cancelTapped() {
self.view.endEditing(true)
}
let getDevice: UITextField = {
let textFieldframe = CGRect()
let textField2 = SkyFloatingLabelTextFieldWithIcon(frame: textFieldframe, iconType: .image)
...
return textField2
}()
#objc func GetDevice() {
self.getDevice.text = self.gradePickerValues1[0]
}
override func viewDidLoad() {
super.viewDidLoad()
picker.backgroundColor = .white
picker.showsSelectionIndicator = true
picker.delegate = self
picker.dataSource = self
getDevice.inputView = picker
GetDevice()
let toolBar = UIToolbar()
toolBar.barStyle = UIBarStyle.default
toolBar.isTranslucent = true
toolBar.tintColor = UIColor(..)
toolBar.sizeToFit()
let spaceButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonItem.SystemItem.flexibleSpace, target: nil, action: nil)
let cancelButton = UIBarButtonItem(title: "İptal", style: UIBarButtonItem.Style.plain, target: self, action: #selector(cancelTapped))
toolBar.setItems([cancelButton, spaceButton], animated: false)
toolBar.isUserInteractionEnabled = true
getDevice.inputAccessoryView = toolBar
view.addSubview(getDevice)
getDevice.snp.makeConstraints { (make) in
make.centerX.equalTo(view).offset(50)
make.top.equalTo(view).offset(510)
make.height.equalTo(50)
make.width.equalTo(200)
}