Simutaneuoulsly Get the viewer Parameter

How could we get the viewer parameters after we did some actions on the window and are there ways to simultaneously get those paras?

For example, I create a viewer = view(data, cmap = cm.xray). Then I change the cmap to jet by selecting the colormap in the viewing window. Now I call view.cmap, it still returns xray instead of jet.
Another example is that I want to print the camera information simultaneously when I toggle around the image