iOS的图表：网格线绘图问题

Question

我试图让使用iOS的图表库网格线，以最终实现这样的

Desired Effect

到目前为止我的代码

FUNC setChart（数据点： [字符串]，值：[双]）{

var dataEntries: [ChartDataEntry] = [] 

    let yAxis = lineChartView.getAxis(.Left) 
    let yAxisRight = lineChartView.getAxis(.Right) 

    let xAxis = lineChartView.xAxis 

    lineChartView.drawBordersEnabled = true 

    xAxis.spaceBetweenLabels = 1 
    xAxis.drawGridLinesEnabled = true 
    xAxis.gridLineWidth = 0.25 

    yAxisRight.enabled = false 
    yAxis.drawGridLinesEnabled = true 
    yAxis.axisMaxValue = 4.0 
    yAxis.axisMinValue = 1.0 
    yAxis.inverted = true 
    yAxis.setLabelCount(4, force: true) 
    yAxis.axisLineColor = UIColor.whiteColor() 

    var dataEntry = ChartDataEntry(value: 1.0, xIndex: 0) 
    dataEntries.append(dataEntry) 
    dataEntry = ChartDataEntry(value: 1.0, xIndex: 1) 
    dataEntries.append(dataEntry) 
    dataEntry = ChartDataEntry(value: 2.0, xIndex: 1) 
    dataEntries.append(dataEntry) 
    dataEntry = ChartDataEntry(value: 2.0, xIndex: 2) 
    dataEntries.append(dataEntry) 

    let lineChartDataSet = LineChartDataSet(yVals: dataEntries, label: "Units Sold") 
    let lineChartData = LineChartData(xVals: dataPoints, dataSet: lineChartDataSet) 
    lineChartView.data = lineChartData 

} 

//我的结果

result

网格线似乎不是绘图。任何见解都非常感谢。

Answer 1

您的网格线可能太薄 - 在分辨率较低的设备上，可能导致根本不显示线条。

iPhone 6或6 plus会显示一个0.25像素的行...但早期的设备不会。