CODEWITHSUNDEEP
swiftcs193p
Danielle Rutter
Danielle Rutter

Reputation: 1

cs193p Swift - key value coding error

I can't believe I'm having a problem with the very first lecture! We are building a calculator (it is not at all functional as a calculator at this point). Mine was working just fine until the performOperation function was added. Now I'm getting "this class is not key value coding compliant" error. The thing is that, as far as I can see, my code EXACTLY replicates the code that he is using in the class. I must be missing something but I've checked roughly 50 times to find a difference and I can't find one. Help? It is crashing every time.

import UIKit

class ViewController: UIViewController {

@IBOutlet weak var display: UILabel!

var userIsInTheMiddleOfTyping = false

@IBAction func touchDigit(sender: UIButton) {
    let digit = sender.currentTitle!

    if userIsInTheMiddleOfTyping {
        let textCurrentlyInDisplay = display.text!
        display.text = textCurrentlyInDisplay + digit
    } else {
        display.text = digit
    }

    userIsInTheMiddleOfTyping = true
}


@IBAction func performOperation(sender: UIButton) {
    userIsInTheMiddleOfTyping = false
    if let mathematicalSymbol = sender.currentTitle {
        if mathematicalSymbol == "π" {
            display.text = String(M_PI)
        }
    }
}

}

EDIT: Code format

Upvotes: 0

Views: 212

Answers (1)

Jenny Tran
Jenny Tran

Reputation: 553

You can check your viewcontroller in storyboard, at the Module TextField in the right toolbar.

Do following steps if module textfield is empty (there’s no placeholder):

  • Step 1. Focus Module TextField
  • Step 2. Edit randomly then clear
  • Step 3. Press Enter, if the result is as same as this picture, everything’s going okey.

enter image description here

Upvotes: 1

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