如何在ios图表中创建标记

Question

我正在寻找折线图的标记实现。我正在使用swift 3.我的所有搜索都失败了，我需要一个帮助。

我经历了this步骤，但似乎效果不佳。

我有两张图，当我触摸它们时 - 没有动作（例如波纹管）。

@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)
    }

请帮助我，我被困住了。

Answer 1

另一个线程中的代码不起作用的原因是因为chartValueSelected函数在swift 3.0中与旧版本略有不同。我创建了一个测试项目，并且每次单击打印出的值时都会使用此代码：

 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
 }


}