I am making use of swift 2.3 with TouchCanvas (Apple Pencil Sample App),
in which while drawing,
I am able to switch between pen/pencil/brush/eraser - thickness & colors and the same is applied correspondingly.
Ref: 
Now I upgraded to swift 3.0,
in which which drawing,
when switch between pen/pencil/brush/eraser - thickness & colors, the last picked one is applied to ALL.
Ref:
and also tried apple latest pencil API..Results were same
can please any one tell me exact solution for this..