UIPageViewController的数据来源方法不叫

Question

我在我的iOS应用程序下面的代码：

class BannerTableViewCell: UITableViewCell, UIPageViewControllerDataSource { 
private var pageViewController: UIPageViewController! 
private var pages: [UIViewController] = [] 

override func awakeFromNib() { 
    super.awakeFromNib() 
    self.backgroundColor = UIColor.clearColor() 
    self.backgroundView?.backgroundColor = UIColor.clearColor() 
    self.contentView.backgroundColor = UIColor.clearColor() 
    self.selectionStyle = UITableViewCellSelectionStyle.None 

    pageViewController = UIPageViewController(); 

    self.pageViewController.dataSource = self 
    pageViewController.view.frame = CGRect(x: 0, y: 0, width: UIScreen.mainScreen().bounds.width, height: 130) 
    self.addSubview(pageViewController.view) 

    //Example data 
    let v1 = UIViewController() 
    v1.view.frame = CGRect(x: 0, y: 0, width: UIScreen.mainScreen().bounds.width, height: 130); 
    v1.view.backgroundColor = UIColor.blueColor() 

    let v2 = UIViewController() 
    v2.view.frame = CGRect(x: 0, y: 0, width: UIScreen.mainScreen().bounds.width, height: 130); 
    v2.view.backgroundColor = UIColor.greenColor() 

    pages.append(v1) 
    pages.append(v2) 
} 



func pageViewController(pageViewController: UIPageViewController, 
    viewControllerBeforeViewController viewController: UIViewController) -> UIViewController? { 
     guard let viewControllerIndex = pages.indexOf(viewController) else { 
      return nil 
     } 

     let previousIndex = viewControllerIndex - 1 

     guard previousIndex >= 0 else { 
      return nil 
     } 

     guard pages.count > previousIndex else { 
      return nil 
     } 

     return pages[previousIndex] 
} 

func pageViewController(pageViewController: UIPageViewController, 
    viewControllerAfterViewController viewController: UIViewController) -> UIViewController? { 
     guard let viewControllerIndex = pages.indexOf(viewController) else { 
      return nil 
     } 

     let nextIndex = viewControllerIndex + 1 
     let orderedViewControllersCount = pages.count 

     guard orderedViewControllersCount != nextIndex else { 
      return nil 
     } 

     guard orderedViewControllersCount > nextIndex else { 
      return nil 
     } 

     return pages[nextIndex] 
} 

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

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

我实例在表视图这种细胞，但是页面视图控制器此单元格始终是空的，不调用pageViewController的数据源方法。你有什么想法，为什么他们不被称为？

Answer 1

您应该使用记录初始化实例化UIPageViewController：

public init(transitionStyle style: UIPageViewControllerTransitionStyle, navigationOrientation: UIPageViewControllerNavigationOrientation, options: [String : AnyObject]?) 

而且你在awakeFromNib年底创建ViewControllers可以放入pageViewController的时候了。

pageViewController.setViewControllers([v1, v2], direction: UIPageViewControllerNavigationDirection.Forward, animated: true, completion: nil)