Custom Format YAxis

[ajimenezjulio]

I am trying to use a custom format in YAxis, specifically I'm trying to put a "$" symbol and a thousands separator "," also I want to put the thousands separator on the value that is showing above the bars.

Looking in documentation, you use the NSNumberFormatter but I can't, XCode show me an error.

I'm using this code:
let formatoNumeros: NSNumberFormatter = NSNumberFormatter()
formatoNumeros.minimumFractionDigits = 0
formatoNumeros.maximumFractionDigits = 2
formatoNumeros.currencyGroupingSeparator = ","
formatoNumeros.negativeSuffix = " $"
formatoNumeros.positiveSuffix = " $"
yaxis.valueFormatter = formatoNumeros

The error appears on the line: yaxis.valueFormatter = formatoNumeros and it says: "Cannot assign value of type 'NSNumberFormatter' to type 'IAxisValueFormatter', also I've tried casting the variable but it cannot be posible and also have tried to use the NSNumberFormatter on the chartData, like this: chartData.setValueFormatter(formatoNumeros) but here XCode says that cannot assign value of type NSNumber.. to IValueFormatter.

And my questions is what would be the way or ways to customize the YAxis on BarCharts?

PS. The language I'm using is swift

Thanks!

[liuxuan30]

that's because in Chart 3.0, axis changes to use IAxisValueFormatter, which is a protocol. You can conform to it then. If you don't want this high flexible formatter, then you can take DefaultAxisValueFormatter, and pass through a number formatter:

    public init(formatter: NumberFormatter)
    {
        super.init()

        self.formatter = formatter
    }

Just take a look at these classes.

    /// Sets the formatter to be used for formatting the axis labels.
    /// If no formatter is set, the chart will automatically determine a reasonable formatting (concerning decimals) for all the values that are drawn inside the chart.
    /// Use `nil` to use the formatter calculated by the chart.
    open var valueFormatter: IAxisValueFormatter?
    {
        get
        {
            if _axisValueFormatter == nil ||
                (_axisValueFormatter is DefaultAxisValueFormatter &&
                    (_axisValueFormatter as! DefaultAxisValueFormatter).hasAutoDecimals &&
                    (_axisValueFormatter as! DefaultAxisValueFormatter).decimals != decimals)
            {
                _axisValueFormatter = DefaultAxisValueFormatter(decimals: decimals)
            }

            return _axisValueFormatter
        }
        set
        {
            _axisValueFormatter = newValue ?? DefaultAxisValueFormatter(decimals: decimals)
        }
    }

[GuriSarao]

I am getting this error -

Cannot assign value of type 'DayAxisValueFormatter' to type '(any AxisValueFormatter)?'