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我正在使用 core-plot 框架来创建一个带有图例的条形图。除了图例复制了条形图每个部分中的列之外，这一切都有效（请参阅随附的屏幕截图）。

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我查看了 core-plot 类参考，但找不到任何解决此问题的方法。我试图将 CPTLegend 属性 numberOfColumns 设置为 1，将 numberOfRows 设置为 3，这使得图例在图例中显示了适当数量的项目，但它显示的数据不正确。

在此处输入图像描述 在此处输入图像描述

下面是我用来构建条形图的代码。大家有什么建议我可以解决这个问题吗？我假设这不是核心情节的错误，而是传说的限制，我希望有一个解决方法。

// Create barChart from theme
barChart = [[CPTXYGraph alloc] initWithFrame:CGRectZero];
CPTTheme *theme = [CPTTheme themeNamed:kCPTDarkGradientTheme];
[barChart applyTheme:theme];
chartView.hostedGraph = barChart;
barChart.plotAreaFrame.masksToBorder = NO;

barChart.paddingLeft = 60.0;
barChart.paddingTop = 10.0;
barChart.paddingRight = 0.0;
barChart.paddingBottom = 30.0;

//find max y
int maxY = 0;
NSMutableArray *maxDrillDownData = [chartData.drillDownData objectForKey:DRILLDOWN_EQUIPMENT_ALL_TYPE];
for (NSMutableArray *dataArray in maxDrillDownData) {
    maxY = dataArray.count>maxY?dataArray.count:maxY;
}

//add buffer
maxY = maxY+100;

// Add plot space for horizontal bar charts
CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *)barChart.defaultPlotSpace;
plotSpace.yRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(0.0f) length:CPTDecimalFromInt(maxY)];
plotSpace.xRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(0.0f) length:CPTDecimalFromFloat(3.25)];

CPTXYAxisSet *axisSet = (CPTXYAxisSet *)barChart.axisSet;
CPTXYAxis *x = axisSet.xAxis;
x.axisLineStyle = nil;
x.majorTickLineStyle = nil;
x.minorTickLineStyle = nil;
x.majorIntervalLength = CPTDecimalFromString(@"1");
x.orthogonalCoordinateDecimal = CPTDecimalFromString(@"0");
x.titleLocation = CPTDecimalFromFloat(7.5f);
x.titleOffset = 55.0f;
x.labelOffset = 2.0;

// Define some custom labels for the data elements
x.labelRotation = M_PI/4;
x.labelingPolicy = CPTAxisLabelingPolicyNone;
NSArray *customTickLocations = [NSArray arrayWithObjects:[NSDecimalNumber numberWithFloat:0.5], [NSDecimalNumber numberWithFloat:1.5], [NSDecimalNumber numberWithFloat:2.5], nil];
NSArray *xAxisLabels = (NSMutableArray *)[chartData.labels objectForKey:LABELS_EQUIPMENT_TYPE];
NSUInteger labelLocation = 0;
NSMutableArray *customLabels = [NSMutableArray arrayWithCapacity:[xAxisLabels count]];
for (NSNumber *tickLocation in customTickLocations) {
    CPTAxisLabel *newLabel = [[CPTAxisLabel alloc] initWithText: [xAxisLabels objectAtIndex:labelLocation++] textStyle:x.labelTextStyle];
    newLabel.tickLocation = [tickLocation decimalValue];
    newLabel.offset = x.labelOffset;
    [customLabels addObject:newLabel];
    //[newLabel release];
}

x.axisLabels =  [NSSet setWithArray:customLabels];

CPTXYAxis *y = axisSet.yAxis;
y.axisLineStyle = nil;
y.majorTickLineStyle = nil;
y.minorTickLineStyle = nil;
y.majorIntervalLength = CPTDecimalFromString(@"50");
y.orthogonalCoordinateDecimal = CPTDecimalFromString(@"0");
y.title = (NSString *)[chartData.labels objectForKey:LABELS_Y_AXIS];
y.titleOffset = 45.0f;
y.titleLocation = CPTDecimalFromFloat(150.0f);

//identifiers
NSMutableArray *identifiers = (NSMutableArray *)[chartData.identifiers objectForKey:IDENTIFIER_EQUIPMENT_TYPE];

// First bar plot
CPTBarPlot *barPlot = [CPTBarPlot tubularBarPlotWithColor:[CPTColor darkGrayColor] horizontalBars:NO];
barPlot.baseValue = CPTDecimalFromString(@"0");
barPlot.dataSource = self;
barPlot.barOffset = CPTDecimalFromFloat(-0.6f);
barPlot.barWidth = CPTDecimalFromFloat(.5);
barPlot.delegate = self;
barPlot.identifier = (NSString *)[identifiers objectAtIndex:0];
[barChart addPlot:barPlot toPlotSpace:plotSpace];

NSLog(@"barPlot.identifier: %@", barPlot.identifier);

// Second bar plot
barPlot = [CPTBarPlot tubularBarPlotWithColor:[CPTColor blueColor] horizontalBars:NO];
barPlot.dataSource = self;
barPlot.barOffset = CPTDecimalFromFloat(-0.4f);
barPlot.barWidth = CPTDecimalFromFloat(.5);
barPlot.baseValue = CPTDecimalFromString(@"0");
barPlot.identifier = (NSString *)[identifiers objectAtIndex:1];
barPlot.delegate = self;
[barChart addPlot:barPlot toPlotSpace:plotSpace];

NSLog(@"barPlot.identifier: %@", barPlot.identifier);

//third bar plot
barPlot = [CPTBarPlot tubularBarPlotWithColor:[CPTColor redColor] horizontalBars:NO];
barPlot.dataSource = self;
barPlot.barOffset = CPTDecimalFromFloat(-0.2f);
barPlot.barWidth = CPTDecimalFromFloat(.5);
barPlot.baseValue = CPTDecimalFromString(@"0");
barPlot.identifier = (NSString *)[identifiers objectAtIndex:2];
barPlot.delegate = self;
[barChart addPlot:barPlot toPlotSpace:plotSpace];

NSLog(@"barPlot.identifier: %@", barPlot.identifier);

// Add legend
CPTLegend *theLegend = [CPTLegend legendWithGraph:barChart];
theLegend.numberOfColumns = 3;
theLegend.numberOfRows = 1;
theLegend.fill = [CPTFill fillWithColor:[CPTColor whiteColor]];
theLegend.borderLineStyle = [CPTLineStyle lineStyle];
theLegend.cornerRadius = 5.0;

barChart.legend = theLegend;
barChart.legendAnchor = CPTRectAnchorTopRight;
barChart.legendDisplacement = CGPointMake(-10.0f, -20.0f);

谢谢您的帮助！

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2 回答 2

5

确保您的绘图数据源中没有实现以下方法：

-legendTitleForBarPlot:recordIndex:
-barFillForBarPlot:recordIndex:

如果存在这些方法中的任何一种，则绘图会为每个条形图创建一个图例条目，而不是为整个图使用单个图例条目。

于 2012-12-12T00:43:28.377 回答
3

我知道这是一个非常古老的问题，但提供的答案对我没有任何帮助。所以我调查了它并试图弄清楚。在我看来，最好的解决方案是只在你的图例中添加一个图而不是添加图表。添加图表会将与图表关联的所有图表添加到图例中。

CPTLegend *theLegend = [CPTLegend legendWithGraph:barChart];

用。。。来代替

NSMutableArray *legendPlots =[[NSMutableArray alloc] init];
[legendPlots addObject:barPlot];
CPTLegend *theLegend = [CPTLegend legendWithPlots:legendPlots];

我在一个图表中使用多个饼图时遇到了同样的问题。这为我解决了这个问题。

于 2015-05-20T13:00:29.600 回答