core Plot:缩小条形图ios中条形图之间的距离

Question

我正在条形图上绘制两个数据集，我希望它们像直方图一样，所以有人能尽快指导我找到解决方案吗。

我在1个数据集中有2个数据集（谷歌和苹果）。我在1个数据集的条之间没有得到任何空格，但在2个数据集之间得到了太多空格。

这是我的代码，

    -(NSUInteger)numberOfRecordsForPlot:(CPTPlot *)plot
{
    return [[[CPDStockPriceStore sharedInstance] datesInWeek] count];
}
-(NSNumber *)numberForPlot:(CPTPlot *)plot field:(NSUInteger)fieldEnum recordIndex:(NSUInteger)index
{
    if ((fieldEnum == CPTBarPlotFieldBarTip) && (index < [[[CPDStockPriceStore sharedInstance] datesInWeek] count]))
    {
        if ([plot.identifier isEqual:CPDTickerSymbolAAPL])
        {
            NSLog(@"apple index:%@",[[[CPDStockPriceStore sharedInstance] weeklyPrices:CPDTickerSymbolAAPL] objectAtIndex:index]);
           return [[[CPDStockPriceStore sharedInstance] weeklyPrices:CPDTickerSymbolAAPL] objectAtIndex:index];
        }
        else if ([plot.identifier isEqual:CPDTickerSymbolGOOG])
        {
            NSLog(@"google index:%@",[[[CPDStockPriceStore sharedInstance] weeklyPrices:CPDTickerSymbolGOOG] objectAtIndex:index]);
            return [[[CPDStockPriceStore sharedInstance] weeklyPrices:CPDTickerSymbolGOOG] objectAtIndex:index];
        }
    }
    return [NSDecimalNumber numberWithUnsignedInteger:index];

-(void)viewDidLoad
{
    [super viewDidLoad];
    [self initPlot];
}
#pragma mark - Chart behavior
-(void)initPlot
{
    self.hostView.allowPinchScaling = YES;
    [self configureGraph];
    [self configurePlots];
    [self configureAxes];
    graphData=[[CPDStockPriceStore sharedInstance] weeklyPrices:CPDTickerSymbolAAPL];
    NSLog(@"google:%@",graphData);
}
-(void)configureGraph {
    // 1 - Create the graph
    CPTGraph *graph = [[CPTXYGraph alloc] initWithFrame:self.hostView.bounds];
    graph.plotAreaFrame.masksToBorder = NO;
    self.hostView.hostedGraph = graph;
    // 2 - Configure the graph
    [graph applyTheme:[CPTTheme themeNamed:kCPTPlainWhiteTheme]];
    graph.paddingBottom = 30.0f;
    graph.paddingLeft  = 30.0f;
    graph.paddingTop    = -1.0f;
    graph.paddingRight  = -5.0f;
    CGFloat xMin = 0.0f;
    CGFloat xMax = [[[CPDStockPriceStore sharedInstance] datesInWeek] count];
    CGFloat yMin = 0.0f;
    CGFloat yMax = 800.0f;  // should determine dynamically based on max price
    CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *) graph.defaultPlotSpace;
    plotSpace.xRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(xMin) length:CPTDecimalFromFloat(xMax)];
    plotSpace.yRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(yMin) length:CPTDecimalFromFloat(yMax)];
}
-(void)configurePlots
{
    // 1 - Set up the three plots
    self.aaplPlot = [CPTBarPlot tubularBarPlotWithColor:[CPTColor colorWithComponentRed:105.0f/255.0f green:252.0f/255.0f blue:144.0f/255.0f alpha:1.0] horizontalBars:NO];
    self.aaplPlot.identifier = CPDTickerSymbolAAPL;
    self.googPlot = [CPTBarPlot tubularBarPlotWithColor:[CPTColor colorWithComponentRed:103.0f/255.0f green:103.0f/255.0f blue:103.0f/255.0f alpha:1.0] horizontalBars:NO];
    self.googPlot.identifier = CPDTickerSymbolGOOG;
    // 2 - Set up line style
    CPTMutableLineStyle *barLineStyle = [[CPTMutableLineStyle alloc] init];
    barLineStyle.lineColor = [CPTColor lightGrayColor];
    barLineStyle.lineWidth = 0.5;
    // 3 - Add plots to graph
    CPTGraph *graph = self.hostView.hostedGraph;
    CGFloat barX = CPDBarInitialX;
    NSArray *plots =[NSArray arrayWithObjects:self.aaplPlot, self.googPlot, nil];
    for (CPTBarPlot *plot in plots)
    {
        plot.dataSource = self;
        plot.delegate = self;
        plot.barWidth = CPTDecimalFromDouble(CPDBarWidth);
        plot.barOffset = CPTDecimalFromDouble(barX);
        plot.lineStyle = barLineStyle;
        [graph addPlot:plot toPlotSpace:graph.defaultPlotSpace];
        barX += CPDBarWidth;
    }
}
-(void)configureAxes
{
    // 1 - Configure styles
    CPTMutableTextStyle *axisTitleStyle = [CPTMutableTextStyle textStyle];
    axisTitleStyle.color = [CPTColor whiteColor];
    axisTitleStyle.fontName = @"Helvetica-Bold";
    axisTitleStyle.fontSize = 12.0f;
    CPTMutableLineStyle *axisLineStyle = [CPTMutableLineStyle lineStyle];
    axisLineStyle.lineWidth = 2.0f;
    axisLineStyle.lineColor = [[CPTColor whiteColor] colorWithAlphaComponent:1];
    // 2 - Get the graph's axis set
    CPTXYAxisSet *axisSet = (CPTXYAxisSet *) self.hostView.hostedGraph.axisSet;
    // 3 - Configure the x-axis
    axisSet.xAxis.labelingPolicy = CPTAxisLabelingPolicyNone;
    axisSet.xAxis.title = @"Days of Week (Mon - Fri)";
    axisSet.xAxis.titleTextStyle = axisTitleStyle;
    axisSet.xAxis.titleOffset = 10.0f;
    axisSet.xAxis.axisLineStyle = axisLineStyle;
    // 4 - Configure the y-axis
    axisSet.yAxis.labelingPolicy = CPTAxisLabelingPolicyNone;
    axisSet.yAxis.title = @"Price";
    axisSet.yAxis.titleTextStyle = axisTitleStyle;
    axisSet.yAxis.titleOffset = 5.0f;
    axisSet.yAxis.axisLineStyle = axisLineStyle;
}
-(void)hideAnnotation:(CPTGraph *)graph
{
    if ((graph.plotAreaFrame.plotArea) && (self.priceAnnotation)) {
        [graph.plotAreaFrame.plotArea removeAnnotation:self.priceAnnotation];
        self.priceAnnotation = nil;
    }
}

Answer 1

使用CPDBarWidth = 0.15，两个条形图只占连续条形图位置之间空间的30%。增加barWidth以减少相邻钢筋之间的空间。