why Xcode didn't make addition? - swift

Question

I use gm stepper in my app and , it corresponding to labels. I have 4 different labels and one additional label for addition to values . The labels which corresponding to GM Steppers working well but ı stumble in addition values of labels.
class ViewController: UIViewController {
#IBAction func gmstp1(_ sender: GMStepper) {
label1.text = String(sender.value*1.5)
label6.text = String(sender.value)
}
#IBOutlet weak var label1: UILabel!
#IBAction func gmstp2(_ sender: GMStepper) {
label2.text = String(sender.value*0.89)
}
#IBOutlet weak var label2: UILabel!
#IBAction func gmstp3(_ sender: GMStepper) {
label3.text = String(sender.value*26)
}
#IBOutlet weak var label3: UILabel!
#IBAction func gmstp4(_ sender: GMStepper) {
label4.text = String(sender.value*4)
}
#IBOutlet weak var label4: UILabel!
#IBOutlet weak var label5: UILabel!
My question about ; Is there any solution without using buttons? Could you handle that?
*Label5 using for summary.

Answer 1

Simply because, unlike a GMStepper, a UILabel doesn't have a value property. So you'll have to get the text string in each label, convert it to a Double, and then add them up:
if let text1 = label1.text, let value1 = Double(text1),
let text2 = label2.text, let value2 = Double(text2),
let text3 = label3.text, let value3 = Double(text3),
let text4 = label4.text, let value4 = Double(text4) {
let sum = value1 + value2 + value3 + value4
label5.text = String(sum)
}