Ios sendEvent方法上的应用程序崩溃

当我在选择几个项目后旋转应用程序两次时，它会崩溃。我已经重写了sendEvent方法，调试器将在那里停止。当我尝试打印事件类型时，它会显示一些奇怪的信息（我认为这是一个不存在的内存位置）：

编辑（回答Justin的问题）：

1） 我在所有iOS8 iPad模拟器上都经历过崩溃

2） 从新开始，如果我选择6-7个项目，然后旋转两次，它就会崩溃。但我也可以选择一个项目，旋转几次，再选择一些，然后继续旋转，在某个时候它会崩溃

3） 选择项目时，将执行以下代码：

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
    let document = getInfoForSection(indexPath.section).documents[indexPath.item]
    if document.canOpen{
        openDocument(document)

        DataManager.sharedInstance.getDocument(document.uri, after: {
            (document:Document?) -> () in
            if let documentUnwrapped = document{
                let detailVC = NavigationFlowController.sharedInstance.detailViewController;
                if detailVC.document?.uri == documentUnwrapped.uri{
                    NavigationFlowController.sharedInstance.detailViewController.documentUpdated(documentUnwrapped)
                }
            }
        })
    }
}

然后在详图视图控制器中：

func initLayout(){
    if viewForCard == nil{
        // views not yet initialized, happens when initLayout if called from the document setter before this view has been loaded
        // just return, the layouting will be done on viewDidLoad with the correct document instead
        return
    }

    self.navigationItem.rightBarButtonItems = []

    if document == nil{
        // Removed code that handles no document selected
        ...
        return
    }

    heightForCard.constant = NavigationFlowController.sharedInstance.currentState == AppState.PHONE ? CARD_HEIGHT_PHONE : CARD_HEIGHT_TABLET

    viewForCard.hidden = false
    removeAllSubviews(viewForCard)
    removeAllSubviews(viewForDetails)

    viewForDetails.translatesAutoresizingMaskIntoConstraints = false

    self.metaVC?.document = document
    //self.documentVC?.document = document
    self.navigationItem.rightBarButtonItems = []

    downloadDocumentIfNeeded()

    if NavigationFlowController.sharedInstance.currentState == AppState.PAD_LANDSCAPE || NavigationFlowController.sharedInstance.currentState == AppState.PAD_PORTRAIT{
        self.viewForDetails.backgroundColor = document?.senderStyling?.color

        addChildViewController(self.metaVC!)
        addChildViewController(self.documentVC!)

        let metaView = self.metaVC!.view
        let documentView:UIView = self.documentVC!.view

        viewForDetails.addSubview(metaView)
        viewForDetails.addSubview(documentView)

        // whole lot of layouting code removed
        ...            

        let doubleTap = UITapGestureRecognizer(target: self, action: "toggleZoom")
        documentVC!.view.addGestureRecognizer(doubleTap)

    }else{
        // Phone version code removed
        ...
    }   
}

编辑2：

func downloadDocumentIfNeeded(){
    var tmpPath:NSURL?
    if let url = document?.contentUrl{
        let directoryURL = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)[0]

        if let docName = self.document?.name,
            safeName = disallowedCharacters?.stringByReplacingMatchesInString(docName, options: [], range: NSMakeRange(0, docName.characters.count), withTemplate: "-"){
                tmpPath = directoryURL.URLByAppendingPathComponent("\(safeName)_\(DetailViewController.dateFormatter.stringFromDate(self.document!.creationDate!)).pdf")

        }


        if let urlString = tmpPath?.path{
            if NSFileManager.defaultManager().fileExistsAtPath(urlString) {
                // File is there, load it
                loadDocumentInWebview(tmpPath!)
            }else{
                // Download file
                let destination: (NSURL, NSHTTPURLResponse) -> (NSURL) = {
                    (temporaryURL, response) in

                    if let path = tmpPath{
                        return path
                    }

                    return temporaryURL
                }

                download(.GET, URLString: url, destination: destination).response {
                    (request, response, data, error) in

                    if error != nil && error?.code != 516{
                        ToastView.showToastInParentView(self.view, withText: "An error has occurred while loading the document", withDuaration: 10)
                    }else if let pathUnwrapped = tmpPath {
                        self.loadDocumentInWebview(pathUnwrapped)
                    }
                }
            }
        }
    }
}

func loadDocumentInWebview(path:NSURL){
    if self.navigationItem.rightBarButtonItems == nil{
        self.navigationItem.rightBarButtonItems = []
    }

    self.documentVC?.finalPath = path

    let shareItem = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.Action, target: self, action: "share")
    shareItem.tag = SHARE_ITEM_TAG

    addNavItem(shareItem)

}

func addNavItem(navItem:UIBarButtonItem){
    var addIt = true
    for item in self.navigationItem.rightBarButtonItems!{
        if item.tag == navItem.tag{
            addIt = false
        }
    }

    if addIt{
        self.navigationItem.rightBarButtonItems?.append(navItem)
        self.navigationItem.rightBarButtonItems!.sortInPlace({ $0.tag > $1.tag })
    }
}

EDIT3：我已重写sendEvent方法来跟踪用户是否正在触摸应用程序，但即使我取出此代码，它仍会崩溃，然后UIApplicationMain上的调试器会中断

override func sendEvent(event: UIEvent)
{        
    super.sendEvent(event)

    if event.type == UIEventType.Touches{
        if let touches = event.allTouches(){
            for item in touches{
                if let touch = item as? UITouch{
                    if touch.phase == UITouchPhase.Began{
                        touchCounter++
                    }else if touch.phase == UITouchPhase.Ended || touch.phase == UITouchPhase.Cancelled{
                        touchCounter--
                    }

                    if touchCounter == 0{
                        receiver?.notTouching()
                    }
                }
            }
        }
    }
}

---

困难的一点是，对这个bug之前发生的事件多了解一点可能会有所帮助

它是否发生在每台设备上（如果不是，哪些设备会给您带来麻烦）

它发生在“大力选择”项目之后。在那之前你的设备改变方向了吗。在你旋转之前也会发生吗

当您“选择一个项目”时，您在代码中做什么

除此之外，我将开始在breakupFormerViewTree（）中删除子ViewController的流程。根据Apple文档，在删除视图之前，您希望告知子视图正在被删除，然后最终从父视图控制器中删除子视图

在这里，它实际上表示您希望在执行删除之前调用willMoveToParentViewController（nil）。它没有说明如果不这样做会发生什么，但我可以想象操作系统在那里做一些生命周期管理，防止它在以后发送损坏事件

:

编辑（额外代码发布后）

我在你的代码中没有看到任何其他可能导致它崩溃的东西。正如你所说，它看起来确实像是一个内存错误，但不知道它是从哪里来的。试着打开僵尸对象并保护Malloc（Scheme>Run>Diagnostics），也许你可以得到更多关于导致它的原因的信息

---

除此之外，我只是注释掉实现中的负载，用空的ViewControllers交换子类，直到它不再发生。您应该能够确定创建此事件涉及到实现的哪一部分。一旦你这样做了，那么，你就可以精确地指出并评估该实现中的每一行代码。

你能展示一下

下载文档ifneeded（）

？你到底在对这些事件做什么？我在那里看不到

sendEvent

？我已经在Edit3中解释了您是否检查了所有的强制展开（！）选项。还没有，尽管大多数看起来是安全的，如果这是崩溃的原因，调试器不会在其中一个上停止吗？

func downloadDocumentIfNeeded(){
    var tmpPath:NSURL?
    if let url = document?.contentUrl{
        let directoryURL = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)[0]

        if let docName = self.document?.name,
            safeName = disallowedCharacters?.stringByReplacingMatchesInString(docName, options: [], range: NSMakeRange(0, docName.characters.count), withTemplate: "-"){
                tmpPath = directoryURL.URLByAppendingPathComponent("\(safeName)_\(DetailViewController.dateFormatter.stringFromDate(self.document!.creationDate!)).pdf")

        }


        if let urlString = tmpPath?.path{
            if NSFileManager.defaultManager().fileExistsAtPath(urlString) {
                // File is there, load it
                loadDocumentInWebview(tmpPath!)
            }else{
                // Download file
                let destination: (NSURL, NSHTTPURLResponse) -> (NSURL) = {
                    (temporaryURL, response) in

                    if let path = tmpPath{
                        return path
                    }

                    return temporaryURL
                }

                download(.GET, URLString: url, destination: destination).response {
                    (request, response, data, error) in

                    if error != nil && error?.code != 516{
                        ToastView.showToastInParentView(self.view, withText: "An error has occurred while loading the document", withDuaration: 10)
                    }else if let pathUnwrapped = tmpPath {
                        self.loadDocumentInWebview(pathUnwrapped)
                    }
                }
            }
        }
    }
}

func loadDocumentInWebview(path:NSURL){
    if self.navigationItem.rightBarButtonItems == nil{
        self.navigationItem.rightBarButtonItems = []
    }

    self.documentVC?.finalPath = path

    let shareItem = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.Action, target: self, action: "share")
    shareItem.tag = SHARE_ITEM_TAG

    addNavItem(shareItem)

}

func addNavItem(navItem:UIBarButtonItem){
    var addIt = true
    for item in self.navigationItem.rightBarButtonItems!{
        if item.tag == navItem.tag{
            addIt = false
        }
    }

    if addIt{
        self.navigationItem.rightBarButtonItems?.append(navItem)
        self.navigationItem.rightBarButtonItems!.sortInPlace({ $0.tag > $1.tag })
    }
}

override func sendEvent(event: UIEvent)
{        
    super.sendEvent(event)

    if event.type == UIEventType.Touches{
        if let touches = event.allTouches(){
            for item in touches{
                if let touch = item as? UITouch{
                    if touch.phase == UITouchPhase.Began{
                        touchCounter++
                    }else if touch.phase == UITouchPhase.Ended || touch.phase == UITouchPhase.Cancelled{
                        touchCounter--
                    }

                    if touchCounter == 0{
                        receiver?.notTouching()
                    }
                }
            }
        }
    }
}