How to use IValueFormatter in stacked bar chart

[hiralnaik]

Hi there

I am trying to use IValueFormatter in stacked bar chart but dataSetIndex is always retuning 0. I want to display different text for different stacked bar. I have max 2 stacked bar. Value is coming properly but I want to display text on it.

`public func stringForValue(_ value: Double, entry: ChartDataEntry, dataSetIndex: Int, viewPortHandler: ViewPortHandler?) -> String {

    if let index = chartValues.index(of: value) {
        formatter.numberStyle = .percent
        formatter.maximumFractionDigits = 0
        formatter.minimumIntegerDigits = 1
        print(dataSetIndex) //this return 0 ever time
        print(entry.x)
        print(entry.y)
        return "\(formatter.string(from: NSNumber.init(value: value))!)\n\(self.stringsValues[index])"
    }
    return ""
}`

Any help.

Thanks

[liuxuan30]

how many data sets you have in the first place.. a stacked bar should only have one data set for sure.. Why don't you check stacked bar chart in ChartsDemo? It's already a good demo

[hiralnaik]

I checked that demo. It doesn't have that solution what I am looking for. I am display value + text on bar. In the current demo it displays only number with formatter.
For example
I have values [15, 8] and I want to display on stack bar like this

Thanks

[liuxuan30]

two things:

1. it already have formatter, so you can format the string with percentage + value;
2. wrapping seems not supported yet. You might need to override drawValues to enable two line texts.

[hiralnaik]

That's right. But think about situation in this function,
public func stringForValue(_ value: Double, entry: ChartDataEntry, dataSetIndex: Int, viewPortHandler: ViewPortHandler?) -> String

when value will be same how can I identify if the value is for 1st stack or 2nd stack.

something like
value for 1st stack = 0.5
value for 2ns stack = 0.5

[phanindra92]

    let data = BarChartData(dataSet: set)
    let format = NumberFormatter()
    format.numberStyle = .none
    let formatter = DefaultValueFormatter(formatter: format)
    data.setValueFormatter(formatter)

[chinghoi]

That's right. But think about situation in this function,
public func stringForValue(_ value: Double, entry: ChartDataEntry, dataSetIndex: Int, viewPortHandler: ViewPortHandler?) -> String

when value will be same how can I identify if the value is for 1st stack or 2nd stack.

something like
value for 1st stack = 0.5
value for 2ns stack = 0.5

I also encountered this problem, how did you solve it in the end?