ios - 在 Swift3 上开发演练屏幕

Question

我对 Swift 很陌生，我正在尝试为我的应用程序开发一个演练屏幕。我正在按照书籍教程进行操作，但出现以下错误并且无法继续。

我认为问题出在 Swift 的不同更新上。您能帮我解决这个问题吗？

self.pageViewController = (self.storyboard?.instantiateViewController(withIdentifier: "pageViewController") as! UIPageViewController!) as! UIPageViewControllerDataSource!

let startVC = self.viewControllerAtIndex(index: 0) as ContentViewController
let viewControllers = NSArray(object: startVC)

self.pageViewController.view.frame = CGRectMake (0,30,self.view.frame.width,self.view.frame.height-60)

self.addChildViewController(pageViewController as! UIViewController)
self.view.addSubview(pageViewController.view)

self.pageViewController.didMoveToParentViewController(self)

Answer 1

pageViewController类型是UIPageViewControllerDataSource 。这是一个协议(protocol)，而不是 UIViewController .
您不需要转换 UIPageViewController至UIPageViewControllerDataSource 。您需要实现 UIPageViewControllerDataSource并设置pageViewController数据来源。

var pageViewController: UIPageViewController

self.pageViewController = self.storyboard?.instantiateViewController(withIdentifier: "pageViewController") as! UIPageViewController
self.pageViewController.datasource = self

let startVC = self.viewControllerAtIndex(index: 0) as ContentViewController
let viewControllers = NSArray(object: startVC)

self.pageViewController.view.frame = CGRectMake (0,30,self.view.frame.width,self.view.frame.height-60)

self.addChildViewController(pageViewController as! UIViewController)
self.view.addSubview(pageViewController.view)

self.pageViewController.didMoveToParentViewController(self)