Iphone 如何使用coreplot在散点图中获得3个图例框？

我添加了此代码以添加绘图。使用上述代码，我只能绘制一个图例框。但我的要求是获得三个图例框。我哪里做错了。请验证代码并让我知道我哪里做错了？

除非您省略了一些设置代码，问题是在创建图例时，图形没有任何绘图。将绘图添加到图形后，可以使用

+legendWithGraph:

创建图例，也可以稍后使用

-addPlot:

或

-insertPlot:atIndex:

方法将其添加到图例中。

这很好。将绘图添加到图形后，请确保将最初发布的图例建筑代码移动到某个点。

I am unable to put three legend boxes on the graph.I have tried the following code


     CPTGraph *graph1 = self.hostView.hostedGraph;

        CGFloat legendPadding = -(self.view.bounds.size.width / 8);

        graph1.legendDisplacement = CGPointMake(legendPadding, 0.0);  
                        
        CPTLegend *theLegend1 = [CPTLegend legendWithGraph:graph1];

        theLegend1.numberOfColumns = 1;

        theLegend1.fill = [CPTFill fillWithColor:[CPTColor whiteColor]];

        theLegend1.borderLineStyle = [CPTLineStyle lineStyle];

        theLegend1.cornerRadius = 5.0;       


        graph1.legend = theLegend1;     

        graph1.legendAnchor = CPTRectAnchorTop;
        

        CGFloat legendPadding1 = -(self.view.bounds.size.width / 4);


        graph1.legendDisplacement = CGPointMake(legendPadding1, 0.0);

where am i going wrong ?

Here is the code for adding plots:

     CPTGraph *graph = self.hostView.hostedGraph;
    CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *) graph.defaultPlotSpace;
    plotSpace.delegate = self;
    // 2 - Create the three plots
    aaplPlot = [[[CPTScatterPlot alloc] init]autorelease];
    aaplPlot.dataSource = self;
    aaplPlot.identifier = @"MaxWeight";

    CPTColor *aaplColor = [CPTColor magentaColor];
    [graph addPlot:aaplPlot toPlotSpace:plotSpace];
    googPlot = [[[CPTScatterPlot alloc] init]autorelease];
    googPlot.dataSource = self;
    googPlot.identifier = @"MinWeight";
    CPTColor *googColor = [CPTColor greenColor];
    [graph addPlot:googPlot toPlotSpace:plotSpace];

    msftPlot = [[[CPTScatterPlot alloc] init]autorelease];
    msftPlot.dataSource = self;
    msftPlot.identifier = @"NormalWeight";

    CPTColor *msftColor = [CPTColor blueColor];
    [graph addPlot:msftPlot toPlotSpace:plotSpace];

    [plotSpace scaleToFitPlots:[NSArray arrayWithObjects:aaplPlot,msftPlot,googPlot,nil]];