iOS Charts remove decimal from yValues - swift

Question

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

Answer 1

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
}

Answer 2

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

Answer 3

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.

Answer 4

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::