How to create marker in ios-chart - ios-charts

Question

I am looking for marker implementation for line chart. I am using swift 3. all my searches failed, and I need a help.
I went through this steps, but it seems to not working well.
I have two graphs and when I touch on them - there are no action (example bellow).
#IBOutlet weak var modelLineChartView: LineChartView!
#IBOutlet weak var lineChartView: LineChartView!
....
func chartValueSelected(chartView: ChartViewBase, entry: ChartDataEntry, highlight: Highlight) {
let graphPoint = modelLineChartView.getMarkerPosition(highlight: highlight)
let graphPointt = lineChartView.getMarkerPosition(highlight: highlight)
print(graphPoint.x)
print(graphPointt.x)
}
Please help me, I am stuck.

Answer 1

The reason why the code in the other thread does not work is because the chartValueSelected function is slightly different in swift 3.0 than in older versions. I created a test project and with this code every time you click on a value it is printed out:
import Charts
class ViewController: UIViewController, ChartViewDelegate {
#IBOutlet weak var testLineChartView: LineChartView!
override func viewDidLoad() {
super.viewDidLoad()
testLineChartView.delegate = self
let data = generateLineData()
testLineChartView.data = data
}
func chartValueSelected(_ chartView: ChartViewBase, entry: ChartDataEntry, highlight: Highlight) {
print("entry.value \(entry)")
}
func generateLineData() -> LineChartData {
let data: LineChartData = LineChartData()
var entries: [ChartDataEntry] = []
var dataArr: [Int] = []
dataArr.append(10)
dataArr.append(5)
dataArr.append(8)
dataArr.append(12)
dataArr.append(10)
for index in 0..<5 {
entries.append(ChartDataEntry(x: Double(index)+0.5, y: Double(dataArr[index]) ) )
}
let set: LineChartDataSet = LineChartDataSet(values: entries, label: "Label")
set.setCircleColor(UIColor.blue)
set.lineWidth = 1
set.circleRadius = 5
set.drawCircleHoleEnabled = false
set.valueTextColor = UIColor.blue
set.valueFont = UIFont(name: "Verdana", size: 12.0)!
set.drawFilledEnabled = true
set.mode = Charts.LineChartDataSet.Mode.linear
set.axisDependency = Charts.YAxis.AxisDependency.left
data.addDataSet(set)
return data
}
}