GPageFlipper

GPageFlipper is modify from AFKPageFlipper (https://github.com/mtabini/AFKPageFlipper).

• Because it needs a new DataSource:

---

@protocol GPageFlipperDataSource
    - (UIView *) nextView:(UIView *) currentView inFlipper:(GPageFlipper *) pageFlipper;
    - (UIView *) prevView:(UIView *) currentView inFlipper:(GPageFlipper *) pageFlipper;
@end

• Not the AFKPageFlipper's DataSource

---

@protocol AFKPageFlipperDataSource
    - (NSInteger) numberOfPagesForPageFlipper:(AFKPageFlipper *) pageFlipper;
    - (UIView *) viewForPage:(NSInteger) page inFlipper:(AFKPageFlipper *) pageFlipper;
@end

Enjoy it.