Question

我正在尝试设置两个类似于Core Plot提供的AAPlot样本的图表。它基本上包括一个几乎正确显示的股票图表和第二个图表（交易量表），它应该直接放在股票图表下方。两个图表应共享相同的x轴。

不幸的是，我的应用程序中没有绘制体积图的数据。

即使我将示例源代码与我的强烈对比，我也找不到错误的来源。

你能指点我正确的方向吗？

这是我的代码：

- (void)configureChart
{
    self.graph = [[CPTXYGraph alloc] initWithFrame:self.hostView.bounds];
    self.hostView.hostedGraph = self.graph;
    self.graph.paddingLeft = 0.0f;
    self.graph.paddingTop = 0.0f;
    self.graph.paddingRight = 0.0f;
    self.graph.paddingBottom = 0.0f;
    self.graph.axisSet = nil;

    // 2 - Set up text style
    CPTMutableTextStyle *textStyle = [CPTMutableTextStyle textStyle];
    textStyle.color = [CPTColor grayColor];
    textStyle.fontName = @"Helvetica-Bold";
    textStyle.fontSize = 16.0f;

    // 3 - Configure title
    NSString *title = self.issue.company.companyName;
    _graph.title = title;    
    _graph.titleTextStyle = textStyle;
    _graph.titlePlotAreaFrameAnchor = CPTRectAnchorTop;    
    _graph.titleDisplacement = CGPointMake(0.0f, -12.0f);      

    // 4 - Set theme
    [self.graph applyTheme:[CPTTheme themeNamed:kCPTStocksTheme]];

    _graph.plotAreaFrame.cornerRadius  = 0.0f;
    CPTMutableLineStyle *borderLineStyle = [CPTMutableLineStyle lineStyle];
    borderLineStyle.lineColor           = [CPTColor whiteColor];
    borderLineStyle.lineWidth           = 2.0f;
    _graph.plotAreaFrame.borderLineStyle = borderLineStyle;


    // Axes
    CPTXYAxisSet *xyAxisSet        = (id)self.graph.axisSet;
    CPTXYAxis *xAxis               = xyAxisSet.xAxis;
    CPTMutableLineStyle *lineStyle = [xAxis.axisLineStyle mutableCopy];
    lineStyle.lineCap   = kCGLineCapButt;
    xAxis.axisLineStyle = lineStyle;
    xAxis.labelingPolicy = CPTAxisLabelingPolicyNone;

    CPTXYAxis *yAxis = xyAxisSet.yAxis;
    yAxis.axisLineStyle = nil;

    // OHLC plot
    CPTMutableLineStyle *whiteLineStyle = [CPTMutableLineStyle lineStyle];
    whiteLineStyle.lineColor = [CPTColor whiteColor];
    whiteLineStyle.lineWidth = 1.0f;
    CPTTradingRangePlot *ohlcPlot = [[CPTTradingRangePlot alloc] initWithFrame:self.graph.bounds];
    ohlcPlot.identifier = @"OHLC";
    ohlcPlot.lineStyle  = whiteLineStyle;
    CPTMutableTextStyle *whiteTextStyle = [CPTMutableTextStyle textStyle];
    whiteTextStyle.color    = [CPTColor whiteColor];
    whiteTextStyle.fontSize = 8.0;
    ohlcPlot.labelTextStyle = whiteTextStyle;
    ohlcPlot.labelOffset    = 5.0;
    ohlcPlot.stickLength    = 2.0f;
    ohlcPlot.dataSource     = self;
    ohlcPlot.plotStyle      = CPTTradingRangePlotStyleOHLC;
    [self.graph addPlot:ohlcPlot];

    // Add volume plot space
    CPTXYPlotSpace *volumePlotSpace = [[CPTXYPlotSpace alloc] init];
    volumePlotSpace.identifier = @"Volume";
    [_graph addPlotSpace:volumePlotSpace];

    CPTBarPlot *volumePlot = [CPTBarPlot tubularBarPlotWithColor:[CPTColor whiteColor] horizontalBars:NO];
    volumePlot.dataSource = self;

    lineStyle            = [volumePlot.lineStyle mutableCopy];
    lineStyle.lineColor  = [CPTColor whiteColor];
    volumePlot.lineStyle = lineStyle;

    volumePlot.fill       = nil;
    volumePlot.barWidth   = CPTDecimalFromFloat(1.0f);
    volumePlot.identifier = @"Volume Plot";
    [_graph addPlot:volumePlot toPlotSpace:volumePlotSpace];


    CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *) self.graph.defaultPlotSpace;
    [plotSpace scaleToFitPlots:[self.graph allPlots]];
}

Answer 1

当你只是[_graph addPlot：volumePlot]而不是[_graph addPlot toPlotSpace：volumePlotSpace]时会发生什么？

我想你可能已经使用所有这些不同的情节空间增加了一些额外的限制，这样就可以防止你的两个情节出现。

我并不完全确定，虽然说实话，我也一直在学习Core Plot，我提出的大多数解决方案都是大量游戏和谷歌搜索的结果。如果我想到其他的话，我会编辑这篇文章。

Answer 2

您永远不会为体积绘图空间设置绘图空间范围。它仍然具有默认的x和y范围[0,1]。

核心图：两个图共享相同的x轴

2 个答案: