cs193p – Project #2 Assignment #2 Task #8

Please note, this blog entry is from a previous course. You might want to check out the current one.

Modify the UILabel you added last week to show your CalculatorBrain’s description instead. It should put an = on the end of it (and be positioned strategically so that the display looks like it’s the result of that =). This = was Extra Credit last week, but it is required this week.

When setting the display value use the calculator-brain description for the history text (adding an equal sign).

    var displayValue: Double? {
        ...
        set {
            ...
            history.text = brain.description + " ="
        }
    }

And when starting a new number use it without the equal sign:

    @IBAction func appendDigit(sender: UIButton) {
            ...
            history.text = brain.description != "?" ? brain.description : ""
        }
    }

The complete code for the task #8 is available on GitHub.