斯威夫特，如何獲取當前顯示控制器UIPageViewController

Question

UIPageViewControllerDelegate

func pageViewController(_ pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool) { 
    let viewer = pageViewController.childViewControllers[0] as! KKPhotoViewerController //So I got controller is a constant 
    print(pageViewController.childViewControllers) 
    print(previousViewControllers) 
    photos.selectedIndex = viewer.photoIndex 
    currentViewer = viewer 
} 

Answer 1

試試這個：

if self.pageViewController?.viewControllers?.count > 0 { 
    let currentController = self.pageViewController?.viewControllers![0] 
}