How to get the value that the user chose from a UIPickerView? - swift

Question

This is what I'm trying to accomplish:
I want to take the value that the user selected from 2 different pickerViews and display that value in a textField
let drivingGear = ["1", "12", "36", "60", "84"]
let boxVal = chooseDrivingGear
let boxVal2 = chooseDrivenGear1
let newVal = boxVal / boxVal2
resultBox1.text = newVal
However I couldnt get that to work so I'm now trying this:
#IBAction func chooseBox1Pressed(_sender: UIButton) {
sender.isHidden = true
if chooseDrivingGear.isHidden {
chooseDrivingGear.isHidden = false
}
if chooseDrivingGear[row] == "1" {
let v1 = 1
}
but chooseDrivingGear[row] shows this error: use of unresolved identifier 'row'
(My other code for pickerview) UPDATE:
//first picker view
chooseDrivingGear.isHidden = true
chooseDrivingGear.delegate = self
chooseDrivingGear.dataSource = self
chooseDrivingGear.tag = 0
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
if pickerView.tag == 0 {
chooseBox1.setTitle(drivingGear[row], for: .normal)
chooseDrivingGear.isHidden = true
chooseBox1.isHidden = false
}
}
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return drivingGear[row]
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return drivingGear.count
}
func textFieldShouldBeginEditing(textField: UITextField) -> Bool {
chooseDrivingGear.isHidden = false
chooseDrivingGear2.isHidden = false
chooseDrivingGear3.isHidden = false
chooseDrivenGear1.isHidden = false
chooseDrivenGear2.isHidden = false
chooseDrivenGear3.isHidden = false
return false
}

Answer 1

You can simply try getting the selectedRow from both the pickerViews, get the values for the selected rows and the perform calculation on the values as required to show in the textField.
I have provided a sample code for that below.
class ViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate
{
#IBOutlet weak var pickerView1: UIPickerView!
#IBOutlet weak var pickerView2: UIPickerView!
#IBOutlet weak var textField: UITextField!
let drivingGear = ["1", "12", "36", "60", "84"]
override func viewDidLoad()
{
super.viewDidLoad()
}
#IBAction func showResult(_ sender: UIButton)
{
let val1 = self.drivingGear[self.pickerView1.selectedRow(inComponent: 0)]
let val2 = self.drivingGear[self.pickerView2.selectedRow(inComponent: 0)]
if let intVal1 = Int(val1), let intVal2 = Int(val2)
{
let result = intVal1 / intVal2
self.textField.text = String(result)
}
}
func numberOfComponents(in pickerView: UIPickerView) -> Int
{
return 1
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int
{
return self.drivingGear.count
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String?
{
return self.drivingGear[row]
}
}
Let me know if you still face any issues.