18576

UIPageViewController programmatically turning pages does not update Page Indicator

Question:

When I programmatically turn the page in a UIPageViewController using a method similar to <a href="https://stackoverflow.com/a/8678367/1103584" rel="nofollow">this answer</a>, the Page Indicators are not updated. Swiping to the next/previous page updates the page indicators as expected. What do I need to do to update the Page Indicators when programmatically turning the page? i.e. How do I set the current "index" after programmatically changing the page so the Page Indicators know which page indicator to show as active?

I noticed in the documentation, the following is stated:

<blockquote>

If both of the methods in “Supporting a Page Indicator” are implemented and the page view controller’s transition style is UIPageViewControllerTransitionStyleScroll, a page indicator is visible. Both of these methods are called after the setViewControllers:direction:animated:completion: method is called. <strong>After gesture-driven navigation, these methods are not called.</strong> The index is updated automatically and the number of view controllers is expected to remain constant.

</blockquote>

(see bold text above)

<a href="http://developer.apple.com/library/ios/#documentation/uikit/reference/UIPageViewControllerDataSourceProtocolRef/UIPageViewControllerDataSource.html#//apple_ref/occ/intf/UIPageViewControllerDataSource" rel="nofollow">UIPageViewController documenatation</a>

Does this imply that if you don't use a gesture to turn the page, then there is no way to update the UIPageIndicators?

Thanks in advance for your help.

Answer1:

You can implement the following data source protocol method with the correct page index:

- (NSInteger)presentationIndexForPageViewController:(UIPageViewController *)pageViewController { NSInteger currentPageIndex=0; //find out actual page index of the current view controller return currentPageIndex; }

Answer2:

It means that you are setting the <strong>number of pages</strong> and the <strong>first page</strong> one time, and cannot add (or remove) pages to the Page Control without calling setViewControllers:direction:animated:completion: again. It is basically a write-only property defined in the DataSource protocol.

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