Swift 2语法错误与方向.Forward

我在下一篇文章中写道：

self.pageViewController.setViewControllers(viewControllers as [AnyObject], direction: .Forward, animated: true, completion: nil) 

但是现在，在Swift 2中它打印出下一个错误：

 Could not find member 'Forward' 

我该如何解决？

Answer 1

您应该确保您的viewControllers不是可选的Type。 如：

 var viewControllers:[UIViewController] = [VC1,VC2] self.pageViewController.setViewControllers(viewControllers, direction: UIPageViewControllerNavigationDirection.Forward, animated: true, completion: nil)