我正在尝试以编程方式切换到 pageViewController 上的下一页。我使用单个 contentViewController,在其中根据页面索引编辑内容。
这是我的代码:
override func viewDidLoad() {
self.pageViewController = self.storyboard?.instantiateViewControllerWithIdentifier("RPageViewController") as! UIPageViewController
self.pageViewController.dataSource = self
let startVC = self.viewControllerAtIndex(0) as RatingContentView
let viewControllers = NSArray(object: startVC)
self.pageViewController.setViewControllers(viewControllers as? [UIViewController], direction: .Forward, animated: true, completion: nil)
self.pageViewController.view.frame = CGRectMake(0, 30, self.view.frame.width, self.view.frame.size.height - 35)
self.addChildViewController(self.pageViewController)
self.view.addSubview(self.pageViewController.view)
self.pageViewController.didMoveToParentViewController(self)
}
func viewControllerAtIndex(index: Int) -> RatingContentView{
if ((self.pageTitles.count == 0) || (index >= self.pageTitles.count)) {
return RatingContentView()
}
let vc: RatingContentView = self.storyboard?.instantiateViewControllerWithIdentifier("RatingContentView") as! RatingContentView
if index != 0 {
vc.name = self.arrayParticipants[index - 1]
vc.pictureName = self.arrayPictureOfParticipants[index - 1]
}
vc.pageIndex = index
vc.totalCount = self.arrayParticipants.count
self.indexOfSlide = index
return vc
}
func setNextPage() {
let startVC = self.viewControllerAtIndex(indexOfSlide + 1) as RatingContentView
let viewControllers = NSArray(object: startVC)
self.pageViewController.setViewControllers(viewControllers as? [UIViewController], direction: .Forward, animated: true, completion: nil)
}
它不会在日志中打印任何错误,它只是崩溃并指出此行上的错误: 让 vc: RatingContentView = self.storyboard?.instantiateViewControllerWithIdentifier("RatingContentView") 作为!评级内容 View
我尝试了很多解决方案来克服这个问题,包括将上面的行放在 viewDidLoad 中,但没有一个有效。 我试图转到下一张幻灯片时,该功能 设置下一页() 被调用。
谢谢,
最佳答案
您是否尝试过检查 Storyboard 不为零?我没看到你在哪里设置它。如果它为零,您可能需要在调用 instantiateViewControllerWithIdentifier 之前实例化它:
let storyboard = UIStoryboard(name: "Main", bundle: nil)
另一件可能出错的事情是此处或 Storyboard编辑器中的标识符(“RatingContentView”)拼写错误。
关于ios - 尝试在 pageViewController 中以编程方式更改 View 时崩溃,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/37624895/