CorePlot LineGraph - 悬停/点击图表查看值 - macOS

我正在使用CorePlot在我的macOS应用程序中绘制一个简单的线图。CorePlot LineGraph - 悬停/点击图表查看值 - macOS

CPTXYGraph *newGraph = [[CPTXYGraph alloc] initWithFrame:CGRectZero]; 

CPTTheme *theme  = [CPTTheme themeNamed:kCPTDarkGradientTheme]; 
[newGraph applyTheme:theme]; 
self.graph = newGraph; 
self.hostView.hostedGraph = newGraph; 

newGraph.plotAreaFrame.paddingTop = 10.0; 
newGraph.plotAreaFrame.paddingBottom = 30.0; 
newGraph.plotAreaFrame.paddingLeft = 40.0; 
newGraph.plotAreaFrame.paddingRight = 10.0; 

CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *)newGraph.defaultPlotSpace; 
    plotSpace.xRange = [CPTPlotRange plotRangeWithLocation:@(1.0) length:[NSNumber numberWithUnsignedInteger:[dataArray count]-1]]; 
    plotSpace.yRange = [CPTPlotRange plotRangeWithLocation:@0.0 length:@102.0]; 
    plotSpace.allowsUserInteraction = YES; 

CPTXYAxisSet *axisSet = (CPTXYAxisSet *)newGraph.axisSet; 
    CPTXYAxis *x   = axisSet.xAxis; 
    //x.majorIntervalLength = @1; 
    x.majorIntervalLength = [NSNumber numberWithInt:numberOfIntervalsX]; 
    x.orthogonalPosition = @(0); 
    x.minorTicksPerInterval = 0; 
    x.labelOffset = 0; 

    CPTXYAxis *y = axisSet.yAxis; 
    y.majorIntervalLength = @5; 
    y.minorTicksPerInterval = 0; 
    y.orthogonalPosition = @(1.0); 
    y.labelOffset = 0.0; 

CPTScatterPlot *dataSourceLinePlot = [[CPTScatterPlot alloc] init]; 
    CPTMutableLineStyle *lineStyle = [dataSourceLinePlot.dataLineStyle mutableCopy]; 
    lineStyle.lineWidth    = 2.; 
    lineStyle.lineColor    = [CPTColor greenColor]; 
    dataSourceLinePlot.dataLineStyle = lineStyle; 


    dataSourceLinePlot.dataSource = self; 
    [newGraph addPlot:dataSourceLinePlot];

我期待悬停/点击看到值将是一个默认行为，但看起来不是。我试过搜索论坛，但没有运气。我认为这将是非常简单的。不知道我是否缺少一些东西。

来源

2017-09-12 Vamshi Krishna