UIPickerView showing empty grey box Swift - ios

Question

I haven't a whole lot of code, so I might as well copy it here.
class ViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource{
var buildings = ["BankBuilding", "Cinema" , "CornerShop", "Greg's House"]
#IBOutlet weak var buildText: UITextField!
var buildPickers:UIPickerView = UIPickerView()
override func viewDidLoad() {
super.viewDidLoad()
buildPickers = UIPickerView()
buildPickers.delegate = self
buildPickers.hidden = true;
buildText.inputView = buildPickers
buildText.text = buildings[0]
}
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int{
return 1
}
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int{
println("Count: \(buildings.count)")
return buildings.count
}
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! {
println("creating title: \(buildings[row])")
return buildings[row]
}
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int)
{
println("Selected: \(buildings[row])")
buildText.text = buildings[row]
buildPickers.hidden = true;
}
func textFieldShouldBeginEditing(textField: UITextField) -> Bool {
buildPickers.hidden = false
return false
}
}
The print statements are correct. For numberOfRows... and titleForRow it is printing the correct Strings.
But there is no prints for didSelectRow because, well, I can't select a row.
This is what I get:
You can ignore the Google Map in the background, that shouldn't interfere with the Picker View and is just set up in the StoryBoard.
The Grey window appears when I click on the textField but never shows any content. But the print statements say otherwise.
Does anyone know why this is the case?

Answer 1

Just add this line in your viewDidLoad method:
buildPickers.dataSource = self
And your code will be:
override func viewDidLoad() {
super.viewDidLoad()
buildPickers = UIPickerView()
buildPickers.delegate = self
buildPickers.dataSource = self
buildPickers.hidden = true;
buildText.inputView = buildPickers
buildText.text = buildings[0]
}
And it will show your data.
UPDATE:
It is not showing because you set it hidden in your viewDidLoad.
Just remove this line from your code:
buildPickers.hidden = true
Here is your working code:
import UIKit
class ViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource, UITextFieldDelegate{
var buildings = ["BankBuilding", "Cinema" , "CornerShop", "Greg's House"]
#IBOutlet weak var buildText: UITextField!
var buildPickers:UIPickerView = UIPickerView()
override func viewDidLoad() {
super.viewDidLoad()
buildPickers = UIPickerView()
buildPickers.delegate = self
buildPickers.hidden = true
buildText.delegate = self //set delegate for textField
buildText.inputView = buildPickers
buildText.text = buildings[0]
}
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int{
return 1
}
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int{
println("Count: \(buildings.count)")
return buildings.count
}
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! {
println("creating title: \(buildings[row])")
return buildings[row]
}
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int)
{
println("Selected: \(buildings[row])")
buildText.text = buildings[row]
buildPickers.hidden = true;
}
//this method will call when you click on textField
func textFieldShouldBeginEditing(textField: UITextField) -> Bool {
buildPickers.hidden = false
return true
}
}

Answer 2

Is the delegate set on the text field? Are you getting the callback which you use to un-hide the picker?