Update picker values on button click swift 1.2

Question

I have a working picker view with following lines of code

@IBOutlet var myPicker: UIPickerView! var colors: [String] = ["red","green","blue"] override func viewDidLoad() { super.viewDidLoad() myPicker = UIPickerView() myPicker.dataSource = self myPicker.delegate = self } func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int { return 1 } func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int { return colors.count } func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! { return colors[row] as! String }

i have a button when i click i want to remove all the old values (i'e red, green and blue) and update with the new values (yellow, black)

func buttonClicked(sender: UIButton!) { var btn:UIButton = sender; colors = ["yellow", "black”] myPicker.reloadAllComponents() }

but unfortunately the above code is not working, i'm a newbie in swift and dont know how to implement this, can someone please help me on this?

Does something not work when you implement it the way you show? — Sergey Kalinichenko
– Sergey Kalinichenko, Commented Nov 8, 2015 at 11:12
Your code seems to be valid. Make sure than buttonClicked is called when your button is clicked. — imnosov
– imnosov, Commented Nov 8, 2015 at 11:16
Yes, the buttonClicked is called but it is not updating the values :( — sam
– sam, Commented Nov 8, 2015 at 11:20

matt · Accepted Answer · 2015-11-08 15:43:49Z

The problem is that you have two picker views. The source of the issue is these lines:

override func viewDidLoad() { super.viewDidLoad() myPicker = UIPickerView() // this is the problem myPicker.dataSource = self myPicker.delegate = self }

You are setting myPicker to a completely new and different UIPickerView which you are creating in that line (the one that I've marked with a comment). This is not the picker view that is already in your interface (the one you set up in the storyboard). And you never place this one into the interface. Thus:

The picker view in the interface is left untouched by all your code; the one in the interface never gets a data source, never gets a delegate, and never reloads anything.
The picker view you create in these lines does all those things, but it is not in the interface so you don't see it do anything.

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