如何在 IOS Swift 中捕获页面滑动事件

Question

我使用 UIPageViewController IOS Swift 开发了滑动页面。当最后一页出现时，我需要做一些事情。如何捕捉页面滑动事件。

import UIKit

class ViewController: UIViewController, UIPageViewControllerDataSource, UIPageViewControllerDelegate{

  var pageViewController : UIPageViewController!
  var pageCount = 3

  func pageViewController(pageViewController: UIPageViewController, viewControllerAfterViewController viewController: UIViewController) -> UIViewController? {
    //Return after viewcontroller
  }

  func pageViewController(pageViewController: UIPageViewController, viewControllerBeforeViewController viewController: UIViewController) -> UIViewController? {
    //Return before viewcontroller
  }


  func presentationCountForPageViewController(pageViewController: UIPageViewController) -> Int {
    return pageCount
  }


  func presentationIndexForPageViewController(pageViewController: UIPageViewController) -> Int {
    return 0
  }

}

Answer 1

在你定义的方法中可能会参与这个，像这样，

func pageViewController(pageViewController: UIPageViewController, viewControllerAfterViewController viewController: UIViewController) -> UIViewController? {
    let index : NSInteger = arrproductdetial.indexOfObject(viewController) as NSInteger
    if (index == arrproductdetial.count-1) {
        // Do whatever you are trying to do for last page
    }
    else if (index == arrproductdetial.count) {
        return nil; //the page after last page
    }
}

Answer 2

您刚刚 return 在

中计算 pageCount

func presentationCountForPageViewController(pageViewController: UIPageViewController) -> Int

改为return pageCount.count如下图：

func presentationCountForPageViewController(pageViewController: UIPageViewController) -> Int 
{
    return pageCount.count
}

通过这个你可以得到总计数，你也可以得到最后一个索引。我想这消除了你的疑虑。快乐编码！！！

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