CODE EXAMPLE FOR SWIFT

swift uipickerview

class VC: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {
  var picker: UIPickerView!

    let pickerValues = ["One", "Two", "Three"]

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

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

    func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! {
        return pickerValues[row]
    }

    func pickerView(pickerView: UIPickerView!, didSelectRow row: Int, inComponent component: Int){
        textField.text = pickerValues[row]
    }

    func setUp() {

        picker = UIPickerView()

        picker.dataSource = self
        picker.delegate = self

        textField.inputView = picker 
    }
  
}