如何在 iOS 中使用 JBLineChart 绘制和自定义两条线?

How do I plot and customize two lines with JBLineChart in iOS?

我正在尝试使用 Jawbone 的 iOS 图形库在一张图表上绘制两组数据。这是日期(x 轴)、activity 级别和阈值的数据:

var activityChartLegend = ["11-14", "11-15", "11-16", "11-17", "11-18", "11-19", "11-20"]
var activityChartData = [88, 81, 69, 77, 70, 89, 90]
var activityThreshold = [80, 80, 80, 80, 80, 80, 80]

我已经成功绘制了 activityChartData 的第一行。但是,我对如何为 activityThreshold 绘制第二条线感到困惑。文档有限,所以我不确定如何绘制第二行。在下面的代码中,我将行数返回为“2”,但我不明白如何在以下函数中绘制这两条线。

func numberOfLines(in lineChartView: JBLineChartView!) -> UInt {
    return 2
}

func lineChartView(_ lineChartView: JBLineChartView!, numberOfVerticalValuesAtLineIndex lineIndex: UInt) -> UInt {
    if (lineIndex == 0) {
        return UInt(activityChartData.count)
    }

    return 0
}

func lineChartView(_ lineChartView: JBLineChartView!, verticalValueForHorizontalIndex horizontalIndex: UInt, atLineIndex lineIndex: UInt) -> CGFloat {
    if (lineIndex == 0) {
        return CGFloat(activityChartData[Int(horizontalIndex)])
    }
    return 0
}

此外,我已经用以下代码格式化了第一行,但不明白如何在成功添加到图表视图后如何格式化另一行:

func lineChartView(_ lineChartView: JBLineChartView!, showsDotsForLineAtLineIndex lineIndex: UInt) -> Bool {
    return true // False = do not show the dots
}

func lineChartView(_ lineChartView: JBLineChartView!, dotRadiusForDotAtHorizontalIndex horizontalIndex: UInt, atLineIndex lineIndex: UInt) -> CGFloat {
    return CGFloat(6)
}

func lineChartView(_ lineChartView: JBLineChartView!, colorForDotAtHorizontalIndex horizontalIndex: UInt, atLineIndex lineIndex: UInt) -> UIColor! {
    return UIColor.lightGray
}

func lineChartView(_ lineChartView: JBLineChartView!, smoothLineAtLineIndex lineIndex: UInt) -> Bool {
    return true
}

func lineChartView(_ lineChartView: JBLineChartView!, didSelectLineAt lineIndex: UInt, horizontalIndex: UInt) {
    if (lineIndex == 0){
        let data = activityChartData[Int(horizontalIndex)]
        let key = activityChartLegend[Int(horizontalIndex)]
        activityLabel.text = "Number of steps on \(key): \(data)"
    }
}

我对 iOS 中的编码还很陌生,只找到了关于此主题的有限文档。感谢您提供的任何帮助!

func lineChartView(_ lineChartView: JBLineChartView!, verticalValueForHorizontalIndex horizontalIndex: UInt, atLineIndex lineIndex: UInt) -> CGFloat {
    if (lineIndex == 0) {
         return CGFloat(activityChartData[Int(horizontalIndex)])
    }
    else if (lineIndex == 1)
    {
        return CGFloat(activityChartData2[Int(horizontalIndex)])
    }
    return 0
}

其他功能同理。你会注意到他们有自己的 lineIndex

:D