Why am I getting an error unwrapping these optionals?

Asked Sep 01 '17 at 22:19

Active Sep 01 '17 at 22:45

Viewed 24 times

The calculationField is a UITextField.

I have shown the optionals and removed the rest of the code. I am not used to debugging in xCode, so if you can provide some links to learning how to use xCode's debugging area, that would be great!

@IBAction func oneButton(_ sender: Any) {
    if isTyped == false {
    calculationField.text! = ""
    calculationField.text! += "1"
    isTyped = true
    } else {
        calculationField.text! += "1"
    } }

error message shown on xCode

edited Sep 01 '17 at 22:45

asked Sep 01 '17 at 22:19

Ryan Haire

Most likely, you haven't connected the text field in your storyboard to the outlet in your code. – Paulw11 Sep 01 '17 at 22:25
It is connected. – Ryan Haire Sep 01 '17 at 22:45
Then how are you creating the view controller instance? Is it coming from the storyboard? Follow the debugging steps listed in the duplicate – Paulw11 Sep 01 '17 at 22:53
I used the view controller they provided in the one view app with the main storyboard. I have changed my code up a bit, but still having problems. – Ryan Haire Sep 01 '17 at 23:32
Avoid `!`; set a breakpoint; examine your variables; see what is `nil`. You can even use `print` statements if you don't want to use the debugger. – Paulw11 Sep 01 '17 at 23:39
Alright I'll check that – Ryan Haire Sep 01 '17 at 23:42

Why am I getting an error unwrapping these optionals?

0 Answers0