BAD_ACCESS上UIPageViewController
问题描述：
我有一个工作UIPageViewController保存嵌入UINavigationController多个UIViewControllers每个UIViewController具有图像阵列的预览至极，打开时，实例化一个新UIPageViewController来显示这些图像BAD_ACCESS上UIPageViewController
时我通过图像刷卡，然后轻扫回用“EXC_BAD_ACCESS(code=EXC_I386_GPFLT)”同样的事情，第一个我的应用程序崩溃时我使用的UINavigationController
后退按钮这是为什么，我该如何解决这一问题？
我PageViewController（标记行最后一个我在调试器中得到了崩溃前）：
class DetailPageMasterViewController: UIPageViewController, UIPageViewControllerDelegate, UIPageViewControllerDataSource
{
var presentationPageIndex: Int = 0
var itemsArray = [Aktion]()
var pageViewController: UIPageViewController!
@IBOutlet weak var btnEditOutlet: UIBarButtonItem!
@IBAction func btnEditAction(sender: AnyObject)
{
}
override func viewDidLoad()
{
super.viewDidLoad()
self.pageViewController = UIPageViewController.init(transitionStyle: .Scroll,
navigationOrientation: .Horizontal,
options: nil)
self.pageViewController.delegate = self
self.pageViewController.dataSource = self
self.presentationPageIndex = 0
let firstVC = self.viewControllerAtIndex(presentationPageIndex)
let viewControllers = [firstVC]
self.pageViewController.setViewControllers(viewControllers,
direction: .Forward,
animated: false,
completion: nil)
self.addChildViewController(self.pageViewController)
self.view.addSubview(self.pageViewController.view)
self.pageViewController.didMoveToParentViewController(self)
self.setupPageControl()
}
func pageViewController(pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool)
{
if completed
{
let minionVC = self.pageViewController.viewControllers?.last as! DetailMinionViewController
presentationPageIndex = minionVC.pageIndex
}
}
func viewControllerAtIndex(index: Int) -> DetailMinionViewController
{
let contentVC = self.storyboard?.instantiateViewControllerWithIdentifier("MinionPageViewController") as! DetailMinionViewController
contentVC.aktion = itemsArray[index]
contentVC.pageIndex = index
return contentVC
}
func pageViewController(pageViewController: UIPageViewController, viewControllerBeforeViewController viewController: UIViewController) -> UIViewController?
{
if let viewController = viewController as? DetailMinionViewController
{
var index = viewController.pageIndex
if index == 0 || index == NSNotFound
{
return nil //MARKED LINE
}
index -= 1
return self.viewControllerAtIndex(index)
}
return nil
}
func pageViewController(pageViewController: UIPageViewController, viewControllerAfterViewController viewController: UIViewController) -> UIViewController?
{
if let viewController = viewController as? DetailMinionViewController
{
var index = viewController.pageIndex
if index == NSNotFound
{
return nil
}
index += 1
if index == NSNotFound || index >= itemsArray.count
{
return nil
}
return self.viewControllerAtIndex(index)
}
return nil
}
func presentationCountForPageViewController(pageViewController: UIPageViewController) -> Int
{
return itemsArray.count
}
func presentationIndexForPageViewController(pageViewController: UIPageViewController) -> Int
{
return presentationPageIndex
}
func setupPageControl()
{
UIPageControl.appearance().backgroundColor = UIColor.clearColor()
UIPageControl.appearance().pageIndicatorTintColor = UIColor.whiteColor()
UIPageControl.appearance().currentPageIndicatorTintColor = UIColor.redColor()
}
}
所以结构看起来像UINavigationController - >DetailPageMasterViewController - >DetailMinionViewController - >PicturesPageMasterViewController - >PicturesMinionViewController
答
所以我终于想出了什么导致我的应用程序崩溃。
长话短说：
在PicturesMinionViewController一个gestureRecognizer试图访问一个已经deinitialized ImageView，我pageViewController工作得很好
后用线，在应用程序崩溃的代码这将是有益的。 – pedrouan
也添加一些代码。 –
现在在if if index == 0 ||之前添加了代码 – Tobi