Stacked Bar formatting

I'm struggling to format a stacked bar chart. Here's what I need to do:

Specific, I need to not have any `stackLabels` in my `BarChartDataSet`, but if I pass in an empty array, I get a crash. If I don't set them, default values are displayed.

Secondly, I can't figure out how to set the labels for the bars. Notice in the screenshot, I need to display labels under the bars, but the values are defaulting to 1 and 2 (resp). Again, can't figure out how to update.

Anyone have insight on with variables I need to be using? Thanks!