Hello recently I encountered the same problem and solved it this way-
class ViewController: UIViewController {
var months: [String]!
var unitsSold = [Double]()
weak var axisFormatDelegate: IAxisValueFormatter?
@IBOutlet var viewForChart: BarChartView!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
axisFormatDelegate = self
months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]
unitsSold = [20.0, 4.0, 6.0, 3.0, 12.0, 16.0, 4.0, 18.0, 2.0, 4.0, 5.0, 4.0]
// setChart(_ dataPoints:months,_ forY: unitsSold)
setChart(dataEntryX: months, dataEntryY: unitsSold)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func setChart(dataEntryX forX:[String],dataEntryY forY: [Double]) {
viewForChart.noDataText = "You need to provide data for the chart."
var dataEntries:[BarChartDataEntry] = []
for i in 0..<forX.count{
// print(forX[i])
// let dataEntry = BarChartDataEntry(x: (forX[i] as NSString).doubleValue, y: Double(unitsSold[i]))
let dataEntry = BarChartDataEntry(x: Double(i), y: Double(forY[i]) , data: months as AnyObject?)
print(dataEntry)
dataEntries.append(dataEntry)
}
let chartDataSet = BarChartDataSet(values: dataEntries, label: "Units Sold")
let chartData = BarChartData(dataSet: chartDataSet)
viewForChart.data = chartData
let xAxisValue = viewForChart.xAxis
xAxisValue.valueFormatter = axisFormatDelegate
}
}
At the end simply add the extension for the delegate
extension ViewController: IAxisValueFormatter {
func stringForValue(_ value: Double, axis: AxisBase?) -> String {
return months[Int(value)]
}
}
Figured this solution out through this link
https://medium.com/@skoli/using-realm-and-charts-with-swift-3-in-ios-10-40c42e3838c0#.minfe6kuk