State the difference between View stack and View state?

View states give one way to change the look and feel of a component in response to user action. And a navigation controller can also be used e.g. Tab navigator etc. It depends on the user to select the navigation as per their requirements.
View stack is a component used to display different data, at once. View states are related views of a single set of data.
View stack components cannot be shared easily between the different views, they had to be created each time view is changed.