iOS Charts remove decimal from yValues

Question

How to remove decimals from y values in iOS Charts? Im using the latest iOS Charts release with Swift3

which library are you using ? – Shobhakar Tiwari May 25 '17 at 18:15 — Shobhakar Tiwari, May 25 '17 at 18:15
Have you tried below code for showing your data set value ? – CodeChanger May 30 '17 at 09:43 — CodeChanger, May 30 '17 at 09:43
Im using iOS-Charts https://github.com/danielgindi/Charts – johnny Jun 02 '17 at 22:06 — johnny, Jun 02 '17 at 22:06

score 13 · Accepted Answer · edited Feb 29 '20 at 08:36

Thanks for every one who tried to help, here was the fix, adding the below code

    let formatter = NumberFormatter()
    formatter.numberStyle = .none
    formatter.maximumFractionDigits = 0
    formatter.multiplier = 1.0
    chartData.valueFormatter = DefaultValueFormatter(formatter: formatter)

to the setBarChartData func

func setBarChartData(xValues: [String], yValues: [Double], label: String) {

    var dataEntries: [BarChartDataEntry] = []

    for i in 0..<yValues.count {
        let dataEntry = BarChartDataEntry(x: Double(i), y: yValues[i])
        dataEntries.append(dataEntry)
    }

    let chartDataSet = BarChartDataSet(values: dataEntries, label: label)
    let chartData = BarChartData(dataSet: chartDataSet)


    let formatter = NumberFormatter()
    formatter.numberStyle = .none
    formatter.maximumFractionDigits = 0
    formatter.multiplier = 1.0
    chartData.valueFormatter = DefaultValueFormatter(formatter: formatter)

    let chartFormatter = BarChartFormatter(labels: xValues)
    let xAxis = XAxis()
    xAxis.valueFormatter = chartFormatter
    self.xAxis.valueFormatter = xAxis.valueFormatter

    self.data = chartData
}

Thank you for sharing this solutions – Amardeep puvar Jan 28 '21 at 12:41 — Amardeep puvar, Jan 28 '21 at 12:41

score 7 · Answer 2 · answered Jul 07 '17 at 09:54

7

Could also use:

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

answered Jul 07 '17 at 09:54

AMAN77

6,218
9
45
60

CodeChanger · Answer 3 · 2017-06-06T12:46:54.463

You need to set delegate for value formatter in DataSet like below

Obj-C :

//DataSet 1
LineChartDataSet *set1 = [[LineChartDataSet alloc] initWithValues:values label:@"outstanding"];
set1.valueFormatter = self;

Use below delegate method for formatting your value :

#pragma mark - IChartValueFormatter

- (NSString * _Nonnull)stringForValue:(double)value entry:(ChartDataEntry * _Nonnull)entry dataSetIndex:(NSInteger)dataSetIndex viewPortHandler:(ChartViewPortHandler * _Nullable)viewPortHandler{

        //Format your value what you want here 
        return [NSString stringWithFormat:@"%0.f",value];
}

Confirm Protocol :

@interface YourViewController ()<ChartViewDelegate,IChartValueFormatter>

For Swift you need to create Extension of BarChart and use below methods in it

Swift :

extension BarChartView {

    private class BarChartFormatter: NSObject, IAxisValueFormatter {

        var labels: [String] = []

        func stringForValue(_ value: Double, axis: AxisBase?) -> String {
            return labels[Int(value)]
        }

        init(labels: [String]) {
            super.init()
            self.labels = labels
        }
    }

    func setBarChartData(xValues: [String], yValues: [Double], label: String) {

        var dataEntries: [BarChartDataEntry] = []

        for i in 0..<yValues.count {
            let dataEntry = BarChartDataEntry(x: Double(i), y: yValues[i])
            dataEntries.append(dataEntry)
        }

        let chartDataSet = BarChartDataSet(values: dataEntries, label: label)
        let chartData = BarChartData(dataSet: chartDataSet)

        let chartFormatter = BarChartFormatter(labels: xValues)
        let xAxis = XAxis()
        xAxis.valueFormatter = chartFormatter
        self.xAxis.valueFormatter = xAxis.valueFormatter

        self.data = chartData
    }
}

Call Above Extension Method like this :

func setChart(){
        let months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]
        let unitsSold = [20.0, 4.0, 3.0, 6.0, 12.0, 16.0, 4.0, 18.0, 2.0, 4.0, 5.0, 4.0]

        barChartView.setBarChartData(xValues: months, yValues: unitsSold, label: "Monthly Sales")
    }

hope you will get your formatted value on line chart.

Thanks, the code make sense, I'm using swift and im using extensions for the data set, so I'm trying to make it work with swift! will keep you updated. — johnny, Jun 02 '17 at 22:05
Thats great I have also updated my code with both ObjC and Swift for other user ref. — CodeChanger, Jun 06 '17 at 12:49
Thanks! This is exactly what im doing, but im getting the decimals for the yValues — johnny, Jun 06 '17 at 14:35

score 0 · Answer 4 · edited Feb 12 '23 at 09:58

After lots of research and test. i was able to remove the decimal.

First unlock the pod chartViewBase
Remove two lines from the { } i.e 'digits' from chartViewBase pod.

Before:

if let formatter = defaultValueFormatter as? DefaultValueFormatter
{
  // setup the formatter with a new number of digits
  let digits = reference.decimalPlaces
  formatter.decimals = digits
}

After:

if let formatter = defaultValueFormatter as? DefaultValueFormatter
{
  
}

It will look like following::

iOS Charts remove decimal from yValues

4 Answers4

Linked