如何替换iOS图表中的标签值？ [英] how to replace the values of labels in iOS-charts?

问题描述

我使用IOS图表绘制下载速度。我给图表函数数组double，它有字节值。它构建图表。但我想在图表标签中显示兆字节，千字节或字节的值。我可以通过帮助 NSByteFormatter 在这些值中转换字节。但是有一个问题，构建图表的函数需要一个值的数组（例如字节数组），并在图表上的标签中输出相同的值，我试图找到一个解决方案来做到这一点，但我发现无。

I use IOS-charts for drawing of downloading speed. I give to chart function array of double which has byte values. It build chart. But I want to show in chart labels value in megabytes, kilobytes or byte. I can transform byte in these value with help NSByteFormatter. But there is one problem, a function that builds charts takes a single array of values (such as an array of bytes), and outputs the same values in the labels on the chart, I tried to find a solution to do this, but I found none. How can i do this?

绘制图表的函数

   func setSendChart(description: [String], value: [Double]) {
    var chartDataEntryArray = [ChartDataEntry]()

    for item in 0..<description.count {
        let chartEntry = ChartDataEntry(value: value[item], xIndex: item)
        chartDataEntryArray.append(chartEntry)
    }

    let dataSet = LineChartDataSet(yVals: chartDataEntryArray, label: "")
    dataSet.drawCircleHoleEnabled = false
    dataSet.drawCirclesEnabled = false
    dataSet.drawCubicEnabled = true
    dataSet.drawFilledEnabled = true
    dataSet.drawValuesEnabled = false

    dataSet.fillColor = UIColor(red: 47/255, green: 206/255, blue: 255/255, alpha: 1.0)

    let chartData = LineChartData(xVals: description, dataSet: dataSet)
    sendChartView.data = chartData
}

推荐答案

您不能更改图表正在使用的值来绘制;但是，您可以提供自己的 NSNumberFormatter 实现，以获取所需的格式化值。 yAxis 有valueFormatter，因此 dataSet

You can't change the value the chart is using to draw; however, you could provide your own NSNumberFormatter implementation to get the formatted value you want. yAxis has valueFormatter, so does dataSet

是，你的子类dataSet传递你的值文本数组，并重写 renderAxisLabels 或 drawValues 来绘制你想要的文本。

Another way is, you subclass dataSet to pass your value text array, and override renderAxisLabels or drawValues to draw the text you want.

我喜欢第一个，因为它不接触库代码

I would prefer the first one since it does not touch the library code

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