每翻页后调用一次方法调用UIPageViewController

最初我以为这是一件非常简单的事情，但看起来不是这样。我需要在我的UIPageViewController中发生页面翻转时向我的服务器发出一个简单的GET请求。我试图把使服务器调用该方法的方法，如：每翻页后调用一次方法调用UIPageViewController

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController 

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController 

- (PageContentViewController *)viewControllerAtIndex:(NSUInteger)index

但所有这些方法被调用后始终每一页翻动的UIPageViewController试图维持viewcontrollers我猜的缓存。有没有解决这个问题的方法？

来源

2017-01-18 Vamshi Krishna

你应该实现UIPageViewControllerDelegate方法

- (void)pageViewController:(UIPageViewController *)pageViewController didFinishAnimating:(BOOL)finished previousViewControllers:(NSArray *)previousViewControllers transitionCompleted:(BOOL)completed 
{ 
    if (finished) { 
     // in case you are sure that you shows only YourViewController 
     YourViewController *vc = (YourViewController *)pageViewController.viewControllers.lastObject; 
     // decide what is the index of the controller based on your own logic and do what you want with it 
    } 
}

希望它能帮助！

来源

2017-01-18 17:56:08 Sander

是的，当然，确保将委托设置为实现此方法的对象。 – danh

无论如何，我可以使用页面翻转的索引或在上面的方法翻转了吗？ –

增加了描述如何接收显示的UIViewController的索引 – Sander

每翻页后调用一次方法调用UIPageViewController

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