How to set a fixed position to the x-axis in core-plot

Question

In my application I have a core-plot graph. The labels of the x-axis display in the graph area. This is a capture:

I don't know what is wrong. I'm using expandRangeByFactor for yRange with this code

[yRange expandRangeByFactor:CPTDecimalFromCGFloat(2.1f)];

But the problem is that when the data changes, the x-axis labels move up or down. I don't understand this behavior.

Is possible to fix the x-axis labels to one position, always at the bottom of graph.

Thank you in advance.

Answer 1

It's hard to tell what's wrong without seeing your code, but you could try setting an axis constraint on the x axis:

CPTXYAxisSet *axisSet = (CPTXYAxisSet *)graph.axisSet;
axisSet.xAxis.axisConstraints = [CPTConstraints constraintWithLowerOffset:0.0];