Making the pie chart to take the whole width/height of the container

In order for the Pie to take the whole width/height of the container you will need to:

1) Disable callouts / labels;
2) Set all margins to zero;
3) Disable slice pullout functionality.

Like this:

chart.labelsEnabled = false;
chart.autoMargins = false;
chart.marginTop = 0;
chart.marginBottom = 0;
chart.marginLeft = 0;
chart.marginRight = 0;
chart.pullOutRadius = 0;