getting 3 pickerviews to add together to give me a number - uikit

Question

Hi I'm learning swift very green and unfortunately i have been learning via reading the swift.org files and random youtube but this is the problem I either don't know what questions to search for or what i need to do to fix the issue.
I am trying to calculate the GCS Glasgow Coma Scale using 3 pickerviews and a textField for the ending total. I have what i think is a working pickerview for all three fields which is eyes, verbal, motor. all placed into different arrays. how do i get the picker selection to give me data that i can then do a if else logic or something to add the 3 answers together. (they are in string but i need a int)
any help will be much appreciated and if i am completely wrong please help me correct my issues
class TraumaViewController: UIViewController {
#IBOutlet weak var eyesField: UITextField!
#IBOutlet weak var verbalField: UITextField!
#IBOutlet weak var motorField: UITextField!
#IBOutlet weak var TotalGCSfield: UITextField!
let eyes = ["Open - 4", "To Sound - 3", "To Pain - 2", "none - 1"]
let verbal = ["Oriented - 5", "Confused - 4", "Inapproriate - 3", "Incomprehensible - 2", "None - 1"]
let motor = ["Obeys - 6", "Moves - 5", "Withdrawals - 4", "Decorticate - 3", "Decerebate - 2", "None - 1"]
var eyespickerview = UIPickerView()
var verbalpickerview = UIPickerView()
var motorpickerview = UIPickerView()
override func viewDidLoad() {
super.viewDidLoad()
for item in eyes {
print (item)
}
// pickerview.delegate = self
// pickerview.dataSource = self
eyesField.inputView = eyespickerview
verbalField.inputView = verbalpickerview
motorField.inputView = motorpickerview
eyespickerview.delegate = self
eyespickerview.dataSource = self
verbalpickerview.delegate = self
verbalpickerview.dataSource = self
motorpickerview.delegate = self
motorpickerview.dataSource = self
eyespickerview.tag = 1
verbalpickerview.tag = 2
motorpickerview.tag = 3
}
}
extension TraumaViewController: UIPickerViewDelegate, UIPickerViewDataSource {
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
switch pickerView.tag {
case 1:
return eyes.count
case 2:
return verbal.count
case 3:
return motor.count
default:
return 1
}
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
switch pickerView.tag {
case 1:
return eyes[row]
case 2:
return verbal[row]
case 3:
return motor[row]
default:
return "data not found"
}
func eyesConvert() {
if let eyes = Double(eyesField.text!) {
print (eyes)
}
}
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
switch pickerView.tag {
case 1:
eyesField.text = eyes[row]
eyesField.resignFirstResponder()
case 2:
verbalField.text = verbal[row]
verbalField.resignFirstResponder()
case 3:
motorField.text = motor[row]
motorField.resignFirstResponder()
default:
return
}
}