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我现在有一个UIPageController其正确地检测在滚动UIPageController - 检测当前页面如果刷卡取消(SWIFT 3 *)
上一个或下一个的PageIndex我的问题,而我需要的是一个解决方案。 ..
示例: - 用户向左或向右滚动,但随后决定在滑动过程中取消...因此保留在当前页面上。
的PageIndex的更改未定页面(见下页),而不是实际的当前页面..
目前我的代码来实现上述声明: -
func pageViewController(_ pageViewController: UIPageViewController, willTransitionTo pendingViewControllers: [UIViewController]) {
if let itemController = pendingViewControllers[0] as? PageContentViewController {
nextIndex = itemController.pageIndex
print("Page index = \(nextIndex)")
}
}
func pageViewController(_ pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool) {
currentIndex = nextIndex
print("Current Page = \(currentIndex)")
}
func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
let itemController = viewController as! PageContentViewController
if itemController.pageIndex < numberOfPages {
return getItemController(itemController.pageIndex+1)
}
return nil
}
func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
let itemController = viewController as! PageContentViewController
if itemController.pageIndex > 0 {
return getItemController(itemController.pageIndex-1)
}
return nil
}
func getItemController(_ itemIndex: Int) -> PageContentViewController? {
if itemIndex < numberOfPages {
let pageItemController = self.storyboard!.instantiateViewController(withIdentifier: "Page1") as! PageContentViewController
pageItemController.pageIndex = itemIndex
return pageItemController
}
return nil
}
我想要得到的页面显示之前的页码,以便我可以显示特定的对象等。
viewControllerAfter和viewControllerBefore似乎不会被每一次调用,因此我不能依赖这个委托方法