How do I update textfield2 based on editing textfield1? - ios

Question

I like to update textfield2 as soon as totalAmount has been edited, I am trying the following:
totalAmount.addTarget(self, action: "changeTextField2:", forControlEvents: UIControlEvents.EditingDidEndOnExit)
func changeTextField2(textField: UITextField) {
print("Total amount: \(totalAmount.text)")
//amount vat - calculate vat based on textField
amountVAT.text = "88"
}
And i am saving the text field values with
func newItem(){
let context = self.context
let ent = NSEntityDescription.entityForName("List", inManagedObjectContext: context)
let nItem = List(entity: ent!, insertIntoManagedObjectContext: context)
let numberFormatter = NSNumberFormatter()
nItem.amountVAT = numberFormatter.numberFromString(amountVAT.text!)
.....more values
nItem.invoiceImage = UIImagePNGRepresentation(imageHolder.image!)
do {
try context.save()
} catch {
print(error)
}
}
func saveValues(sender: AnyObject) {
if nItem != nil {
editItem()
} else {
newItem()
}
dismissVC()
}

Answer 1

This can be done using UITextFieldDelegate Method use this function
1.)
textField1.delegate = self
2.)
func textFieldDidEndEditing(textField: UITextField)
{
if textField == textField1
{
textField2.text = textField1.text
}
}
now its upto you how you change the totalAmount.

Answer 2

Use the delegate function of UITextField
- textFieldDidEndEditing: for your textField1. Once in this function, you can get value of textField1 and you can edit textField2.
Apple Documentation for UITextFieldDelegate

Answer 3

Change the code to this totalAmount.addTarget(self, action: "changeTextField2:", forControlEvents: UIControlEvents.EditingChanged)
i.e change the UIControlEvents to "EditingChanged"