XZPageViewController:UIPageViewController实现搜狐新闻视图切换效果

XZPageViewController 主要通过UIPageViewController实现 1.设置导航宽度 - (float)numOfPages; 2.设置导航宽度 - (float)witdhOfNav; 3.导航标题 - (NSString *)titleOfNavAtIndex:(NSInteger)index; 4.设置viewController - (UIViewController *)viewPageController:(XZPageViewController *)pageViewController contentViewControllerForNavAtIndex:(NSInteger)index; 5.是否循环 - (BOOL)canPageViewControllerRecycle; 6.导航切换，viewcontroller是否动画展示 - (BOO