ios - Core Plot 图底轴不可见

Question

我有一个 core-plot 折线图，显示如下(为清楚起见，背景 View 为红色):

我的底部填充为 0，并且配置了带有标签的 x 轴。尽管该图被挤压到 View 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。

为了将图表从 View 底部向上移动并显示轴，我需要更改什么？

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

尝试向 graph.plotAreaFrame 添加底部填充。