A view switcher is a control that allows switching between a number of predefined views. It appears as a set of toggle buttons that are placed in the center of a header bar.
There are two primary cases when a view switcher is appropriate:
When presenting content, and it is useful to be able to view different sets or sub-sets of content. For example, a music application could show different views for artists, albums and playlists.
If your application provides discrete groups of functionality which are typically used independently.
As a rule of thumb, a view switcher should contain between three and five views. If you have more views, a sidebar list might be a more appropriate view switching control.
Each view should have a short and clear title.
Buttons in the view switcher widget can indicate when there is activity in a view.
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