The values on the the axis seem to be repeated rather than being replaced as you can see in the screenshot below it should be plotting the "Jan", "Feb", "Mar", "Apr", "May", "Jun" rather than the result in the simulator.
Here is the code
class ViewController: UIViewController {
@IBOutlet weak var chartContainer: LineChartView!
let months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun"]
let unitsSold = [20.0, 4.0, 6.0, 3.0, 12.0, 3.0]
override func viewDidLoad() {
super.viewDidLoad()
setChart(dataPoints: months, values: unitsSold)
}
func setChart(dataPoints: [String], values: [Double]) {
// Set up x axis
let xaxis = XAxis()
let chartFormatter = ChartFormatter(myArr: months)
// Array for entries
var dataEntries: [ChartDataEntry] = []
// Add new data entries
for i in 0..<dataPoints.count {
let dataEntry = ChartDataEntry(x: Double(i) , y: values[i], data: "a" as AnyObject? )
dataEntries.append(dataEntry)
chartFormatter.stringForValue(Double(i), axis: xaxis)
}
xaxis.valueFormatter = chartFormatter
chartContainer.xAxis.valueFormatter = xaxis.valueFormatter
// Configure the dataset
let lineChartDataSet = LineChartDataSet(values: dataEntries, label: "Units Sold")
let lineChartData = LineChartData(dataSet: lineChartDataSet)
chartContainer.data = lineChartData
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
@objc(ChartFormatter)
class ChartFormatter: NSObject, IAxisValueFormatter {
private var myArr: [String]!
init(myArr: [String]) {
self.myArr = myArr
}
func stringForValue(_ value: Double, axis: AxisBase?) -> String {
return myArr[Int(value)]
}
}
I fixed the issue myself by adding