Adding line/dataset on line chart that already has a line

[Kalvin126]

There does not seem to be a way to add a new line to a line chart that already has a line. We have a use case where pressing a button would add essentially a "compare to last year" line. We have to reset chart data to add the second line then animate it in. The issue is that the first line disappears, then the animation occurs on both lines.

Correct me if there is a way to do this.

[liuxuan30]

open func addDataSet(_ dataSet: IChartDataSet!) in ChartData

[Kalvin126]

Using addDataSet and then animate(x redraws the existing dataSet though :(