how to get user selection in UIPickerView and use it else where? - arrays

Question

all i want to do is change the values of min avg and max based on what the user selected in the picker menu so that i can use them in the MinC AvgC and MaxC label calculation. for example, if user selected a1 then min = 10, avg = 15, and max = 20, but if user selects a2 i want min to = 20, avg = 25, and max = 30. please help and thank you. your time, effort, and support are appreciated. bellow is my code which is currently working without any errors:
class ViewController: UIViewController, UIPickerViewDelegate, UITextFieldDelegate{
#IBOutlet var PLabel: UILabel!
#IBOutlet weak var C: UITextField!
#IBOutlet var MinC: UILabel!
#IBOutlet var AvgC: UILabel!
#IBOutlet var MaxC: UILabel!
var min = 0
var avg = 0
var max = 0
var P = ["a1","a2","a3","a4"]
var CFiller = ["0"]
override func viewDidLoad()
{super.viewDidLoad()
PLabel.text = P[0]
MinC.text = CFiller[0]
AvgC.text = CFiller[0]
MaxC.text = CFiller[0]
C.keyboardType = UIKeyboardType.NumberPad}
override func didReceiveMemoryWarning()
{super.didReceiveMemoryWarning()}
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int
{ return 1}
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int
{return P.count}
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String?
{return P[row]}
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int)
{ var PSelected = P[row]
PLabel.text = PSelected}
#IBAction func CalcButton(sender: AnyObject)
{if let ic = Int (C.text!)
{MinC.text = "\(min * ic)"
AvgC.text = "\(avg * ic)"
MaxC.text = "\(max * ic)"}}
}

Answer 1

Seems to me like you just need to use a switch statement to achieve your goal.
This could look something like this:
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int)
{ var PSelected = P[row]
PLabel.text = PSelected
switch PSelected {
case "a1":
min = 10
avg = 15
max = 20
case "a2":
min = 20
avg = 25
max = 30
...
default:
break
}
}
You could also set it up more efficiently if you desire, like this:
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int)
{ var PSelected = P[row]
PLabel.text = PSelected
var increment = 10
min = 10
avg = 15
max = 20
min += increment*row //if a1, then row == 0, so nothing is added
avg += increment*row
max += increment*row
}