我怎样画垂直线？

Question

如何为每个日期绘制一条垂直线

y轴运行良好，但为什么不是x轴？

x轴代码：

CPTMutableLineStyle *majorGridLineStyle = [CPTMutableLineStyle lineStyle];
majorGridLineStyle.lineWidth = 2;
majorGridLineStyle.lineColor = [CPTColor redColor];

CPTXYAxisSet *axisSet = (CPTXYAxisSet *)graph.axisSet;

CPTXYAxis *x = [axisSet xAxis];
x.axisLineStyle = nil;
x.majorTickLineStyle = majorGridLineStyle;

[x setLabelingPolicy:CPTAxisLabelingPolicyNone];
x.majorGridLineStyle = majorGridLineStyle;

NSArray *subjectsArray = [self getSubjectTitlesAsArray];
[x setAxisLabels:[NSSet setWithArray:subjectsArray]];

y轴代码：

CPTXYAxis *y = axisSet.yAxis;
y.axisLineStyle = nil;
y.majorTickLineStyle = nil;
y.minorTickLineStyle = nil;
y.majorIntervalLength = CPTDecimalFromString(@"500");
y.orthogonalCoordinateDecimal = CPTDecimalFromString(@"0");

y.majorGridLineStyle = gridLineStyle;

我的错误是什么？

Answer 1

Core Plot将在主要刻度位置绘制网格线。确保日期值与刻度线位置一致，gridLineStyle是一种将在白色背景下显示的样式。