In this example, using ng-switch, I'm able to switch between different views. Each view is assigned a controller.
I've put a quick sample online here : http://jsfiddle.net/FBHjZ/1/
It looks like the controller is reinstanciated everytime I switch views : If you enter a val in the input field, go to home and switch back to settings, the value is lost.
How can I prevent this? Basically, what I want is to keep state from previous views when I switch between views.
There is no way of preventing the existing ngSwitch from re-instantiating controllers and re-creating a new scope. As noted in the documentation this directive is creating a new scope and actually creates / destroys corresponding DOM elements.
If you goal is to preserve state just put it in one of the parent scopes, check this jsFiddle: http://jsfiddle.net/FBHjZ/2/
An alternative approach is to use a service for the shared model.
来源：https://stackoverflow.com/questions/12956945/how-to-prevent-controller-reloading-when-using-ng-switch