Swift: Why can I pass info from one IBAction to another, but not to a function - swift

Question

I am trying to get the values for splitValue and tipPercent into the getSettings() at the bottom. Why can I get the values for both of those in the IBAction calculatePressed, but when I try to get the values into the function the value is nil. I am sooo confused. Thank you for the help!
#IBOutlet weak var billTextField: UITextField!
#IBOutlet weak var zeroPctButton: UIButton!
#IBOutlet weak var tenPctButton: UIButton!
#IBOutlet weak var twentyPctButton: UIButton!
#IBOutlet weak var splitNumberLabel: UILabel!
var tipChosen = ""
var totalPerPerson = ""
var tipPercent = ""
var splitValue = ""
#IBAction func tipChanged(_ sender: UIButton) {
tipPercent = sender.currentTitle!
if sender.isSelected == true {
return
}
zeroPctButton.isSelected = false
tenPctButton.isSelected = false
twentyPctButton.isSelected = false
sender.isSelected = true
if sender.currentTitle == "0%" {
tipChosen = "0.00"
} else if sender.currentTitle == "10%" {
tipChosen = "0.10"
} else if sender.currentTitle == "20%" {
tipChosen = "0.20"
}
billTextField.endEditing(true)
}
#IBAction func stepperValueChanged(_ sender: UIStepper) {
splitValue = String(Int(sender.value))
splitNumberLabel.text = String(Int(sender.value))
}
#IBAction func calculatePressed(_ sender: UIButton) {
let bill = Float(billTextField.text!)!
let tip = Float(tipChosen)!
let tax = bill * tip
let splitNumber = Float(splitNumberLabel.text!)
let total = (bill + tax) / Float(splitNumber!)
totalPerPerson = "$\(String(format: "%.2f", total))"
performSegue(withIdentifier: "goToTotal", sender: self)
}
func getSettings() -> String {
return "Split between \(splitValue) people, with a \(tipPercent) tip."
}

Answer 1

Ok, sorry it took me a bit, but I finally think I understand what I did.
class CalculatorViewController: UIViewController {
var tip = 0.0
var finalBill = ""
var split = 2
#IBOutlet weak var billTextField: UITextField!
#IBOutlet weak var zeroPctButton: UIButton!
#IBOutlet weak var tenPctButton: UIButton!
#IBOutlet weak var twentyPctButton: UIButton!
#IBOutlet weak var splitNumberLabel: UILabel!
#IBAction func tipChanged(_ sender: UIButton) {
if sender.isSelected == false {
sender.isSelected = false
} else if sender.isSelected == true {
sender.isSelected = true
}
zeroPctButton.isSelected = false
tenPctButton.isSelected = false
twentyPctButton.isSelected = false
sender.isSelected = true
billTextField.endEditing(true)
}
#IBAction func stepperValueChanged(_ sender: UIStepper) {
splitNumberLabel.text = Int(sender.value).description
}
#IBAction func calculatePressed(_ sender: UIButton) {
if zeroPctButton.isSelected == true {
tip = 0.0
} else if tenPctButton.isSelected == true {
tip = 0.1
} else if twentyPctButton.isSelected == true {
tip = 0.2
}
print(tip)
let bill = Double(billTextField.text!)
split = Int(Double(splitNumberLabel.text!)!)
if billTextField.text != "" {
let billWithTip = (bill! * tip) + bill!
let billWithTipSplit = billWithTip / Double(split)
finalBill = String(format: "%.2f", billWithTipSplit)
print(billWithTip)
}
self.performSegue(withIdentifier: "getResults", sender: self)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "getResults" {
let destinationVC = segue.destination as! ResultsViewController
destinationVC.finalBill = finalBill
destinationVC.split = split
destinationVC.tip = tip
}
}
}
class ResultsViewController: UIViewController {
#IBOutlet weak var totalLabel: UILabel!
#IBOutlet weak var settingsLabel: UILabel!
var tip = 0.0
var split = 2
var finalBill = ""
override func viewDidLoad() {
super.viewDidLoad()
totalLabel.text = "$\(finalBill)"
settingsLabel.text = "Split between \(Int(split)) people, with a \(Int(tip * 100))% tip"
}
#IBAction func recalculatePressed(_ sender: UIButton) {
dismiss(animated: true, completion: nil)
}
}
I did what you suggested with the string and some minor calculations on the second view controller, changed the values of a few declared properties and got rid of the getSettings(). I was under the impression that I couldn't pass data without a return value from a function. Thank you for the help!