What is a good framework for using web-view like tabs for native applications?

I woul开发者_运维知识库d like to implement web-view like tabs in a native iPhone application. I would prefer not to write it from scratch. Is there a framework I can use for this feature? Here is an example.

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Apple's Guidelines would tell you to use a Tab Bar placed at the bottom for this. It's also possible to create upper "tabs" using a styled UISegmentedControl or just UIButton's that switches views.