Hello, Please help me understand why it's not calling else branch when empty(nil) input ? So, after input a text into a textField it returns data as expected:

    func textFieldShouldEndEditing(_ textField: UITextField) -> Bool {

        if textField.text == Optional("") {
            print("This is optional")
        } else { print ("This is \(textField.text) and not optional nil") }

        if let inputCity = textField.text {
            print("fuction to get city data - \(inputCity)")
            return true
        } else {
            print("Rise alert NO city entered")
            return false
        }
    }

OutPut:

This is Optional("Paris") and not optional nil
fuction to get city data - Paris

But when empty input entered, it does not call else as expected

This is optional
fuction to get city data - 

Because an empty string is still a string, not nil. So if let inputCity = textField.text unwraps textField.text and assigns its value ("") to inputCity and the first branch of your if else executes.

If you want to switch to the second branch when textField.text is either nil or an empty string, you can do this:

        if let inputCity = textField.text, !inputCity.isEmpty {
            print("fuction to get city data - \(inputCity)")
            return true
        } else {
            print("Rise alert NO city entered")
            return false
        }

Aaah, that's make sense... Great, thanks a lot. It's more clear now.