ios - 已经显式地将 NSArray 转换为 [AnyObject] 但仍然收到错误

Question

嗨，我刚刚将我的 xcode 更新到最新版本(我认为是 7.1.1)，然后我收到错误消息，指出 NSArray 不能隐式转换为 AnyObject，从这一行开始: self .pageViewController.setViewControllers(viewControllers as [AnyObject]，方向:.Forward，动画:true，完成:nil)

viewControllers 是一个 NSArray 类型。它建议我使用“AS”来显式转换。不过，我想我已经这么做了。为什么我仍然收到错误？是格式问题吗？谢谢!

class ViewController: UIViewController, UIPageViewControllerDataSource {

var pageViewController: UIPageViewController!
var pageTitles: NSArray!
var pageImages: NSArray!

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    self.pageTitles = NSArray(objects: "hi","hey")
    self.pageImages = NSArray(objects: "1","2")
    self.pageViewController = self.storyboard?.instantiateViewControllerWithIdentifier("PageViewController")as! UIPageViewController
    self.pageViewController.dataSource = self

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

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


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

    self.addChildViewController(self.pageViewController)
    self.view.addSubview(self.pageViewController.view)
    self.pageViewController.didMoveToParentViewController(self)
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.

}

Answer 1

setViewControllers:direction:animated:completion: 的第一个参数声明为 [UIViewController]? 而不是 [AnyObject]?。

也许这就足够了:

let startVC = self.viewControllerAtIndex(0) as ContentViewController
self.pageViewController.setViewControllers([startVC], direction:.Forward, animated: true, completion: nil)