Core Plot饼图上奇怪的边框

Question

为什么Core Plot绘制这两行？

这就是我设置图表的方式:

// setup the pie chart
graph = [[CPTXYGraph alloc] initWithFrame:[_pieView bounds]];
[_pieView setHostedGraph:graph];

CPTPieChart *pieChart = [[CPTPieChart alloc] init];
[pieChart setDataSource:self];
[pieChart setPieRadius:75.0];
[pieChart setIdentifier:@"PieChart1"];
[pieChart setStartAngle:M_PI_4];
[pieChart setSliceDirection:CPTPieDirectionClockwise];

[graph addPlot:pieChart];

(_pieView是CPTGraphHostingView*)

如何删除两条黑线？我尝试过如何删除核心图表周围的边框,但无济于事.

Answer 1

这不是边框 - 它是带有a的默认轴CPTXYGraph.这是删除它们的一行代码:

graph.axisSet = nil;