How to set group width in multiple bar chart?

[ikki08]

So, I try to create multiple bar chart in objective-c. I look into the example project. But some how, the x axis label is not in the right position.

You can see at the image above. The position of the label and the grouped bar is not in the same position. How I can fix this problem?

[liuxuan30]

check out @interface MultipleBarChartViewController in ChartsDemo

[data groupBarsFromX: startYear groupSpace: groupSpace barSpace: barSpace];