Core Plot图底部轴不可见

Question

我有一个核心情节线图，显示如下（为清晰起见，背景视图为红色）：

我底部有0个填充，我有一个带有标签的x轴。尽管如此，图表仍被挤压在视图的底部。如果我增加底部填充，我会在底部得到一个灰色条，结果相同。

为了从图表底部向上移动图形并显示轴，我需要更改什么？

代码很冗长，但这里有一些摘录：

    self->graph = [[CPTXYGraph alloc] initWithFrame:hostView.bounds];
    hostView.hostedGraph = graph;
    self->graph.paddingLeft = 0.0f;
    self->graph.paddingTop = 10.0f;
    self->graph.paddingRight = 0.0f;
    self->graph.paddingBottom = 0.0f;

    ...

    [plotSpace scaleToFitPlots:[NSArray arrayWithObjects:p1, p2, p3, nil]];
    CPTMutablePlotRange *xRange = [plotSpace.xRange mutableCopy];
    [xRange expandRangeByFactor:CPTDecimalFromCGFloat(1.1f)];
    plotSpace.xRange = xRange;
    CPTMutablePlotRange *yRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(0.0f) length:CPTDecimalFromFloat(500.0f)];
    plotSpace.yRange = yRange;

    ...

    CPTXYAxisSet *axisSet = (CPTXYAxisSet *) self->graph.axisSet;
    CPTAxis *x = axisSet.xAxis;
    x.axisLineStyle = axisLineStyle;
    x.labelingPolicy = CPTAxisLabelingPolicyNone;
    x.majorTickLineStyle = axisLineStyle;
    x.majorTickLength = 4.0f;
    x.tickDirection = CPTSignNegative;

    ...

    x.axisLabels = xLabels;
    x.majorTickLocations = xLocations;

Answer 1

尝试将底部填充添加到graph.plotAreaFrame。