更改 Coreplot 图形的刻度标签

Question

我在我的 mac 应用程序中使用 coreplot 作为图表，它工作正常。我需要沿轴显示 custom labels 以显示滴答声，例如：

我有一个功率值随时间变化的图表：Power values -> Y-Axis & Time -> X-Axis。

I want to draw graph for Time seconds values but show fixed intervals ticks of minutes along x-axis for which i figured that i should use custom labels but its not happening for me.

自定义标签的代码是：

  let graph = CPTXYGraph()

  plots[0].identifier = PlotType.target.rawValue
  plots[1].identifier = PlotType.user.rawValue

  for plot in plots {
     plot.dataSource = self
     plot.delegate = self
     graph.addPlot(plot)
  }

  if let plotArea = graph.plotAreaFrame {
     plotArea.borderLineStyle = nil
     plotArea.paddingLeft = 25.0
     plotArea.paddingBottom = 20.0
     plotArea.paddingRight = 10.0
     plotArea.paddingTop = 20.0
  }

  guard let axisSet = graph.axisSet else { return }

  let xAxis = axisSet.axes?[0]
  var xLabels = [CPTAxisLabel]()
  var xLocations = [NSNumber]()

  let doubleSecs = Double(activity.durationSeconds)
  let labels = [0.0, doubleSecs * 0.25, doubleSecs * 0.50, doubleSecs * 0.75, doubleSecs]
  for label in labels {
     let xLabel = CPTAxisLabel(text: "\(label/60)", textStyle: axisTextStyle)
     xLabel.tickLocation = NSNumber(double: label)
     xLocations.append(NSNumber(double: label))
     xLabels.append(xLabel)
  }
  xAxis?.labelingPolicy = CPTAxisLabelingPolicy.LocationsProvided
  xAxis?.labelFormatter = axisFormatter
  xAxis?.axisLabels = Set(xLabels)
  xAxis?.majorTickLocations = Set(xLocations)

  chartView.hostedGraph = graph

使用上面的代码绘制图形并沿 x 轴将时间分成 4 等份并显示标签，一切都很好。

I want to show labels along x-axis as minutes and remaining drawing is ok.

I tried with this : let xLabel = CPTAxisLabel(text: "\(label/60)", textStyle: axisTextStyle()) but labels are not changing no effect.

Also tried to change tickLocation like : xLabel.tickLocation = NSNumber(double: label/60) No effect

With changing majorTickLocations like : xLocations.append(NSNumber(double: label/60)) it behaving weird and all x-axis labels are messed.

我试着按照这个例子：Whosebug Post

谁能指导一下哪里出了问题[记得我用的是Swift]吗？

Answer 1

.LocationsProvided 标签策略使用 labelFormatter 从刻度位置自动创建标签。如果您想使用自定义标签，请改用 .None 标签政策。

Answer 2

我自己解决了这个问题：

  let xAxis = axisSet.axes?[0]
  xAxis?.majorIntervalLength = activity.durationSeconds / 60 / 4
  xAxis?.labelingPolicy = CPTAxisLabelingPolicy.FixedInterval

现在标签按要求来了。

更改 Coreplot 图形的刻度标签

Change Tick Labels for Coreplot Graph

ios

swift

swift2

core-plot