我正在尝试编译我的Xcode应用程序。它可以成功构建，但是不会超过启动屏幕。
另外，它一直使我引用以下特定代码行：instantiateViewControllerWithIdentifier（下面的完整代码），并且在日志中我得到以下消息：
Unknown class ContentViewController in Interface Builder file.
Could not cast value of type 'UIViewController' (0x10741f418) to 'HelloHi.ContentViewController' (0x1049aa2e0).
(lldb)
谁能帮我解决这个问题？
import UIKit
class ViewController: UIViewController, UIPageViewControllerDataSource {
var pageViewController: UIPageViewController!
var pageTitles: NSArray!
var pageImages: NSArray!
override func viewDidLoad() {
super.viewDidLoad()
self.pageTitles = NSArray(objects: "Welcome", "Hello")
self.pageImages = NSArray(objects: "page1", "page2")
self.pageViewController = self.storyboard?.instantiateViewControllerWithIdentifier("PageViewController") as! UIPageViewController
self.pageViewController.dataSource = self
var startVC = self.viewControllerAtIndex(0) as ContentViewController
var viewControllers = [startVC]
self.pageViewController.setViewControllers(viewControllers, direction: .Forward, animated: true, completion: nil)
self.pageViewController.view.frame = CGRectMake(0, 30, self.view.frame.width, self.view.frame.size.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.
}
@IBAction func restartAction(sender: AnyObject) {
var startVC = self.viewControllerAtIndex(0) as ContentViewController
var viewControllers = [startVC]
self.pageViewController.setViewControllers(viewControllers, direction: .Forward, animated: true, completion: nil)
}
func viewControllerAtIndex(index: Int) -> ContentViewController
{
if ((self.pageTitles.count == 0) || (index >= self.pageTitles.count))
{
return ContentViewController()
}
var vc: ContentViewController = self.storyboard?.instantiateViewControllerWithIdentifier("ContentViewController") as! ContentViewController
vc.imageFile = self.pageImages[index] as! String
vc.titleText = self.pageTitles[index] as! String
vc.pageIndex = index
return vc
}
//MARK: - Page View Controller Data Source
func pageViewController(pageViewController: UIPageViewController, viewControllerBeforeViewController viewController: UIViewController) -> UIViewController? {
var vc = viewController as! ContentViewController
var index = vc.pageIndex as Int
if (index == 0 || index == NSNotFound)
{
return nil
}
index--
return self.viewControllerAtIndex(index)
}
func pageViewController(pageViewController: UIPageViewController, viewControllerAfterViewController viewController: UIViewController) -> UIViewController? {
var vc = viewController as! ContentViewController
var index = vc.pageIndex as Int
if (index == NSNotFound)
{
return nil
}
index++
if (index == self.pageTitles.count)
{
return nil
}
return self.viewControllerAtIndex(index)
}
func presentationCountForPageViewController(pageViewController: UIPageViewController) -> Int {
return self.pageTitles.count
}
func presentationIndexForPageViewController(pageViewController: UIPageViewController) -> Int {
return 0
}
}
最佳答案
该错误消息表明Interface Builder文件中的视图控制器设置了错误的类。选择有问题的控制器，打开身份检查器，然后将类名称更改为正确的UIViewController子类。大概这是您的ContentViewController。
当然，您需要在项目中的某个位置定义ContentViewController类。它不在您发布的代码中，并且在出现错误消息后，它不在项目中的其他任何位置。
关于ios - Xcode不会打开ContentViewController，但会停留在启动屏幕上，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/30144866/