核心绘图图底轴不可见

Question

我有一个核心图折线图，显示如下（为清楚起见，背景视图为红色）：

我在底部有 0 个填充，并且我配置了一个带有标签的 x 轴。不过，该图被挤压到视图的底部。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。

为了从视图底部向上移动图表并显示轴，我需要进行哪些更改？

代码很长，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。