Delete last character in Swift 3
Swift 4 (Addendum)
In Swift, you can apply dropLast()
directectly on the String
instance, no longer invoking .characters
to access a CharacterView
of the String
:
var runningNumber = "12345"
runningNumber = String(runningNumber.dropLast())
print(runningNumber) // 1234
Swift 3 (Original answer)
I'll assume runningNumber
is a String
instance. In this case, runningNumber.characters.dropLast()
is not of type String
, but a CharacterView
:
let foo = runningNumber.characters.dropLast()
print(type(of: foo)) // CharacterView
You need to use the CharacterView
to instantiate a String
instance prior to assigning it back to a property of type String
, e.g.
var runningNumber = "12345"
runningNumber = String(runningNumber.characters.dropLast())
print(runningNumber) // 1234
I.e., for your case
@IBAction func onDelPressed (button: UIButton!) {
runningNumber = String(runningNumber.characters.dropLast())
currentLbl.text = runningNumber
}