Show integer value labels in bar chart for iOS

Question

I need to create a bar graph to display some stats data, which I am able to display using iOS charts library. Only issue I am facing is that, the value labels above the bars are printed as double, I need them as integers. I have tried searching it, but no positive results. Below is my code:

    barChartView = BarChartView()
    barChartView.frame = screen.bounds
    barChartView.delegate = self
    barChartView.backgroundColor = UIColor.clear
    barChartView.layer.opacity = 0.0
    barChartView.chartDescription?.text = ""
    self.view.addSubview(barChartView)

Any help is appreciated.

You should include a link to the charts library you are using. — Duncan C, Dec 19 '17 at 19:47
What is `BarChartView`? Where is it declared? Please only show _relevant_ code. `backgroundColor`, `delegate`, `layer.opacity` etc are not relevant to the question. — Ashley Mills, Dec 19 '17 at 20:06
https://github.com/danielgindi/Charts appears to be the chart library. — David S., Dec 19 '17 at 20:36

score 5 · Answer 1 · answered Dec 20 '17 at 07:27

Make a custom formatter to change each value to Int.

class CustomIntFormatter: NSObject, IValueFormatter{
    public func stringForValue(_ value: Double, entry: ChartDataEntry, dataSetIndex: Int, viewPortHandler: ViewPortHandler?) -> String {
        let correctValue = Int(value)
        print("correctValue: \(correctValue)")
        return String(correctValue)
    }
}

Then set the formatter for your graph.

    let formatter: CustomIntFormatter = CustomIntFormatter()
    barChartView.data?.setValueFormatter(formatter)

score 0 · Answer 2 · answered Nov 11 '19 at 16:50

You can simply define formatter and apply that formatter to dataset like below

     NSNumberFormatter *pFormatter = [[NSNumberFormatter alloc] init];
     pFormatter.numberStyle = NSNumberFormatterDecimalStyle;
     pFormatter.maximumFractionDigits = 100;
     pFormatter.multiplier = @1;
     BarChartDataSet *set = nil;
     set = [[BarChartDataSet alloc] initWithEntries:values label:@"Election Result"];
     [set setValueFormatter:[[ChartDefaultValueFormatter alloc]initWithFormatter:pFormatter]];

Show integer value labels in bar chart for iOS

2 Answers2