Picker buttons do not show up - ios

Question

I am attempting to add "done" and "cancel" buttons in a toolbar above a pickerView that will be used to change the value of a label. The label should only be changed when "done" is clicked not when UIPicker received rowSelected.
I can't understand why my "done" and "cancel" buttons do not show above my picker? I'm sure this will be marked as duplicate, but I've done something very similar in Swift 4, and this doesn't seem to work in Swift 5.
import UIKit
class ViewController: UIViewController, UITextFieldDelegate, UIPickerViewDelegate, UIPickerViewDataSource {
#IBOutlet weak var freq: UILabel!
var freqOptions = ["Hz", "kHz", "MHz"]
var freqPicker = UIPickerView()
#IBOutlet weak var freqTextField: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
freqPicker = UIPickerView( frame: CGRect(x: 0, y: 100, width: self.view.frame.width, height: 216) )
freqPicker.backgroundColor = UIColor.white
freqPicker.delegate = self
freqPicker.dataSource = self
freqPicker.isHidden = true
let toolBar = UIToolbar()
let cancelItem = UIBarButtonItem(
title: "Cancel",
style: .plain,
target: self,
action: #selector(cancelFreqInput)
)
let middleItem = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil)
let doneItem = UIBarButtonItem(
title: "Done",
style: .done,
target: self,
action: #selector(confirmFreqInput)
)
toolBar.setItems( [cancelItem, middleItem, doneItem], animated : false )
toolBar.sizeToFit()
view.addSubview(freqPicker)
let freqTap = UITapGestureRecognizer(target: self, action: #selector(freqTap(gestureReconizer:)))
freq.addGestureRecognizer(freqTap)
freqTextField.inputView = freqPicker
freqTextField.inputAccessoryView = toolBar
freqTextField.isHidden = true
freq.isUserInteractionEnabled = true
}
#objc func cancelFreqInput() {
freqTextField.resignFirstResponder()
freq.text = "Hz"
freqTextField.isHidden = true
}
#objc func confirmFreqInput() {
freqTextField.resignFirstResponder()
freqTextField.isHidden = true
}
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return freqOptions.count
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
freq.text = freqOptions[row]
self.view.endEditing(true)
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return freqOptions[row]
}
#objc func freqTap(gestureReconizer: UITapGestureRecognizer) {
freqPicker.isHidden = false
}
}

Answer 1

you don't need to add a picker as a subview. You just need to set it Like an input view (and you already done it). I modified you code. You can just compare and check what was wrong there
class ViewController: UIViewController, UITextFieldDelegate, UIPickerViewDelegate, UIPickerViewDataSource {
#IBOutlet weak var freq: UILabel!
var freqOptions = ["Hz", "kHz", "MHz"]
var freqPicker = UIPickerView()
#IBOutlet weak var freqTextField: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
freqPicker = UIPickerView()
freqPicker.backgroundColor = UIColor.white
freqPicker.delegate = self
freqPicker.dataSource = self
// freqPicker.isHidden = true
let toolBar = UIToolbar()
let cancelItem = UIBarButtonItem(
title: "Cancel",
style: .plain,
target: self,
action: #selector(cancelFreqInput)
)
let middleItem = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil)
let doneItem = UIBarButtonItem(
title: "Done",
style: .done,
target: self,
action: #selector(confirmFreqInput)
)
toolBar.setItems( [cancelItem, middleItem, doneItem], animated : false )
toolBar.sizeToFit()
// view.addSubview(freqPicker)
let freqTap = UITapGestureRecognizer(target: self, action: #selector(freqTap(gestureReconizer:)))
freq.addGestureRecognizer(freqTap)
freqTextField.inputView = freqPicker
freqTextField.inputAccessoryView = toolBar
freqTextField.isHidden = true
freq.isUserInteractionEnabled = true
freqPicker.reloadComponent(0)
}
#objc func cancelFreqInput() {
freqTextField.resignFirstResponder()
freq.text = "Hz"
freqTextField.isHidden = true
}
#objc func confirmFreqInput() {
freq.text = freqOptions[freqPicker.selectedRow(inComponent: 0)]
self.view.endEditing(true)
}
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return freqOptions.count
}
// func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
// freq.text = freqOptions[row]
// self.view.endEditing(true)
// }
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return freqOptions[row]
}
#objc func freqTap(gestureReconizer: UITapGestureRecognizer) {
freqTextField.becomeFirstResponder()
}
}