ios - 核心图 : how to add four axis on left, 右侧、顶部和底部

Question

默认只有左侧和底部的两个轴，我想在右侧和底部添加另一个牵引轴以显示相同的刻度和标签。

提前致谢。

Answer 1

您可以在制作轴时使用约束来做到这一点，

CPTXYAxis *x = [self _makeDefaultAxis];
x.coordinate = CPTCoordinateX;
x.axisConstraints = [CPTConstraints constraintWithLowerOffset:0.0];
x.tickDirection = CPTSignPositive;
// ...

CPTXYAxis *y = [self _makeDefaultAxis];
y.coordinate = CPTCoordinateY;
y.axisConstraints = [CPTConstraints constraintWithLowerOffset:0.0];
y.tickDirection = CPTSignPositive;
// ...

CPTXYAxis *y2 = [self _makeDefaultAxis];
y2.coordinate = CPTCoordinateY;
y2.axisConstraints = [CPTConstraints constraintWithUpperOffset:0.0];
y2.tickDirection = CPTSignNegative;
// ...

CPTXYAxis *x2 = [self _makeDefaultAxis];
x2.coordinate = CPTCoordinateX;
x2.axisConstraints = [CPTConstraints constraintWithUpperOffset:0.0];
x2.tickDirection = CPTSignNegative;

这给出了类似的东西，

因此还要显示调整填充等所需的标签。