iOS Core Plot with Swift - Formatting Axis - ios

Question

Hi I am new to core plot and I have this issue and its bugging me for sometime..
The issue is that both X and Y axis won't show the axis label, axis tile, axis majorlengthinterval, etc.. Basically, I cannot set the axis properties except axis line style. The following is my code.
class testVC: UIViewController, CPTPlotDataSource, CPTPlotDelegate, CPTPlotSpaceDelegate {
var hostView: CPTGraphHostingView!
let xData = ["2","4"]
let yData = ["1","2"]
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
func symbolForScatterPlot(aPlot: CPTScatterPlot, recordIndex index: UInt) -> CPTPlotSymbol {
let dotStyle = CPTPlotSymbol()
dotStyle.size = CGSizeMake(6, 6)
dotStyle.fill = CPTFill(color: CPTColor.blueColor())
dotStyle.symbolType = CPTPlotSymbolType.Ellipse
return dotStyle
}
#IBAction func plotClick(sender: AnyObject) {
let frame = self.view.frame
//add graph
let graph = CPTXYGraph(frame: CGRect(x: 0, y: 50, width: frame.width, height: frame.height - 250))
graph.paddingBottom = 10
graph.paddingLeft = 10
graph.paddingRight = 10
graph.paddingTop = 10
graph.title = "Scatter Plot"
//hostView
hostView = CPTGraphHostingView(frame: graph.frame)
self.view.addSubview(hostView)
//add scatter plot and plot space
var scatterPlot = CPTScatterPlot()
scatterPlot = CPTScatterPlot(frame: hostView.frame)
scatterPlot.delegate = self
scatterPlot.dataSource = self
let plotSpace = graph.defaultPlotSpace as! CPTXYPlotSpace
plotSpace.delegate = self
plotSpace.allowsUserInteraction = true
plotSpace.xRange = CPTPlotRange(location: 0, length: 10)
plotSpace.yRange = CPTPlotRange(location: 0, length: 18)
scatterPlot.dataLineStyle = nil //hide line
graph.addPlot(scatterPlot)
//set axis
let axes: CPTXYAxisSet = CPTXYAxisSet(layer: graph.axisSet!); let x = axes.xAxis; let y = axes.yAxis
let lineStyle = CPTMutableLineStyle()
lineStyle.lineWidth = 3
x!.axisLineStyle = lineStyle; y!.axisLineStyle = lineStyle
x!.title = "X"; y!.title = "Y"
x!.orthogonalPosition = 0; y!.orthogonalPosition = 0
x!.majorIntervalLength = 1; y!.majorIntervalLength = 1
x!.minorTickLength = 4; y!.minorTickLength = 4
hostView.hostedGraph = graph
}
func numberOfRecordsForPlot(plot: CPTPlot) -> UInt {
return 2
}
func numberForPlot(plot: CPTPlot, field fieldEnum: UInt, recordIndex idx: UInt) -> AnyObject? {
if fieldEnum == 0 {
return xData[Int(idx)]
} else {
return yData[Int(idx)]
}
}

Answer 1

You're not setting the axis properties on the one belonging to the graph—you're setting up a copy which then goes away. Try this instead:
let axes = graph.axisSet as? CPTXYAxisSet