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Arcing tab view controller with toggle animation. Supports 2 to 4 tabs. What's more, you can swipe left or right to toggle the views.
B.t.w, this control is separated from iPokeMon (a PokéMon game on iOS with Location Based Service), you can take a look at the demo video how cool it is!
iPokeMon is renamed to Master, and you can Download it from the App Store.