我正在尝试使用一种填充颜色设置折线图,但由于某种原因,填充颜色会褪色。
实施例
我添加到屏幕中间的随机视图和折线图的填充颜色都设置为红色,但由于某种原因,图表的填充颜色会变淡。
可以在这里看到代码
@IBOutlet var liveChart : LineChartView!
override func viewDidLoad() {
super.viewDidLoad()
self.title = "Chart Tests"
configureChart(chart: liveChart)
var xAxis = [String]()
var yAxis = [Double]()
for _ in 0..<10
{
xAxis.append("")
let yVal = Double(randomBetweenNumbers(firstNum: 1.0, secondNum: 100.0))
yAxis.append(yVal)
}
setData(xAxisArray: xAxis, yAxisArray: yAxis, chart: liveChart)
let testView = UIView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
testView.center = view.center
testView.backgroundColor = UIColor.red
view.addSubview(testView)
}
func randomBetweenNumbers(firstNum: CGFloat, secondNum: CGFloat) -> CGFloat{
return CGFloat(arc4random()) / CGFloat(UINT32_MAX) * abs(firstNum - secondNum) + min(firstNum, secondNum)
}
func configureChart(chart : LineChartView)
{
chart.chartDescription?.text = ""
chart.noDataText = "Loading Data"
chart.backgroundColor = UIColor.clear
chart.drawGridBackgroundEnabled = false
chart.dragEnabled = true
chart.rightAxis.enabled = false
chart.leftAxis.enabled = true
chart.doubleTapToZoomEnabled = false
chart.legend.enabled = false
chart.pinchZoomEnabled = true
chart.highlightPerTapEnabled = false
chart.highlightPerDragEnabled = false
chart.xAxis.enabled = false
chart.leftAxis.drawAxisLineEnabled = false
chart.leftAxis.drawGridLinesEnabled = false
chart.leftAxis.labelCount = 5
chart.leftAxis.forceLabelsEnabled = true
}
func setData(xAxisArray : [String], yAxisArray : [Double], chart : LineChartView)
{
var yVals1 : [ChartDataEntry] = [ChartDataEntry]()
if(xAxisArray.count > 0)
{
for i in 0 ..< xAxisArray.count
{
let chartEntry = ChartDataEntry(x: Double(i), y: yAxisArray[i], data: nil)
yVals1.append(chartEntry)
}
}
let set1: LineChartDataSet = LineChartDataSet(values: yVals1, label: "")
set1.fillColor = UIColor.red
set1.drawFilledEnabled = true
set1.drawCirclesEnabled = false
let data = LineChartData()
data.addDataSet(set1)
liveChart.data = data
}
有没有办法解决这个问题?或者这只是图表填充颜色的工作方式?
编辑:
我正在使用
答案 0 :(得分:6)
我假设你使用这个库:https://github.com/kevinbrewster/SwiftCharts
因此 LineChartView
自动设置填充颜色的alpha:https://github.com/kevinbrewster/SwiftCharts/blob/master/SwiftCharts/LineChart.swift#L758
尝试设置数据集的fillAlpha
属性