当我在选择几个项目后旋转应用程序两次时,它会崩溃.我重写了sendEvent方法,这是调试器停止的地方.当我尝试打印事件类型时,它会向我显示一些奇怪的东西(我认为这是一个不存在的内存位置)：
(lldb) print event.type (UIEventType) $R10 = <invalid> (0xff)
不知何故,我认为这与我如何处理轮换有关.我有一个主 – 细节风格的应用程序,它使用不同类型的导航来拍摄风景,拍摄肖像和手机.我创建了一个名为NavigationFlowController的类,它处理所有导航事件并相应地设置视图.在旋转时,它会分解视图树并使用正确的导航重新组合它们
func changeViewHierarchyForDevideAndOrientation(newOrientation:UIInterfaceOrientation? = nil){
print("MA - Calling master layout method")
UIApplication.myDelegate().window?.frame = UIScreen.mainScreen().bounds
let idiom = UIDevice.currentDevice().userInterfaceIdiom
var orientation:UIInterfaceOrientation!
if let no = newOrientation{
orientation = no
}else{
orientation = UIApplication.sharedApplication().statusBarOrientation
}
print("MA - Breaking up view tree...")
breakupFormerViewTree([sidebarViewController,listViewController,detailViewController,loginViewController])
print("MA - Start init navbackbone")
initNavBackboneControllers()
guard let _ = UIApplication.myDelegate().currentUser else {
if idiom == UIUserInterfaceIdiom.Phone{
currentState = AppState.PHONE
}else if idiom == UIUserInterfaceIdiom.Pad && UIInterfaceOrientationIsLandscape(orientation){
currentState = AppState.PAD_LANDSCAPE
}else if idiom == UIUserInterfaceIdiom.Pad && UIInterfaceOrientationIsPortrait(orientation){
currentState = AppState.PAD_PORTRAIT
}
print("MA - Current user is nil - resetting")
mainViewController.addChildViewController(loginViewController)
return
}
if idiom == UIUserInterfaceIdiom.Phone{
currentState = AppState.PHONE
leftNavigationController?.viewControllers = [listViewController]
slideViewController?.rearViewController = sidebarViewController
slideViewController?.frontViewController = leftNavigationController
slideViewController?.rearViewRevealWidth = 267;
mainViewController.addChildViewController(slideViewController!)
}else if idiom == UIUserInterfaceIdiom.Pad && UIInterfaceOrientationIsLandscape(orientation){
currentState = AppState.PAD_LANDSCAPE
leftNavigationController!.viewControllers = [sidebarViewController,listViewController]
rightNavigationController!.viewControllers = [detailViewController]
detailViewController.navigationItem.leftBarButtonItems = []
detailViewController.initLayout()
print("MA - Init split view controller with VCs")
splitViewController!.viewControllers = [leftNavigationController!,rightNavigationController!]
mainViewController.addChildViewController(splitViewController!)
}else if idiom == UIUserInterfaceIdiom.Pad && UIInterfaceOrientationIsPortrait(orientation){
currentState = AppState.PAD_PORTRAIT
leftNavigationController!.pushViewController(sidebarViewController,animated: false)
leftNavigationController!.pushViewController(listViewController,animated: false)
rightNavigationController!.pushViewController(detailViewController,animated: false)
rightNavigationController?.setNavigationBarHidden(false,animated: false)
slideViewController!.rearViewController = leftNavigationController
slideViewController!.frontViewController = rightNavigationController
detailViewController.navigationItem.leftBarButtonItem = UIBarButtonItem(title: "< Documenten",style: UIBarButtonItemStyle.Bordered,target: slideViewController,action: "revealToggle:")
detailViewController.initLayout()
slideViewController!.rearViewRevealWidth = 350;
mainViewController.addChildViewController(slideViewController!)
}
}
func breakupFormerViewTree(vcs:[UIViewController?]){
for vc in vcs{
if let vcUnwrapped = vc,_ = vcUnwrapped.parentViewController {
vcUnwrapped.removeFromParentViewController()
vcUnwrapped.view.removeFromSuperview()
}
}
}
func initNavBackboneControllers(){
leftNavigationController = UINavigationController()
leftNavigationController?.navigationBar.barTintColor = UIColor(red: 0.25,green: 0.25,blue: 0.25,alpha: 1.0)
leftNavigationController?.navigationBar.tintColor = UIColor.whiteColor()
leftNavigationController?.navigationBar.titleTextAttributes = [NSForegroundColorAttributeName: UIColor.whiteColor()]
leftNavigationController?.navigationBar.translucent = false
rightNavigationController = UINavigationController()
rightNavigationController?.navigationBar.barTintColor = UIColor(red: 0.25,alpha: 1.0)
rightNavigationController?.navigationBar.tintColor = UIColor.whiteColor()
rightNavigationController?.navigationBar.titleTextAttributes = [NSForegroundColorAttributeName: UIColor.whiteColor()]
rightNavigationController?.navigationBar.translucent = false
slideViewController = SWRevealViewController()
slideViewController?.rearViewRevealoverdraw = 0;
slideViewController?.bounceBackOnOverdraw = false;
slideViewController?.stableDragOnOverdraw = true;
slideViewController?.delegate = self
if UIDevice.currentDevice().userInterfaceIdiom == UIUserInterfaceIdiom.Pad{
splitViewController = UISplitViewController()
}
}
编辑(回应贾斯汀的问题)：
1)我在所有iOS8 iPad模拟器上都经历过崩溃.
2)从一个新的开始,如果我选择6-7项,然后我旋转两次,它会崩溃.但我也可以选择一个项目,旋转几次,再选择一些并继续旋转,在某些时候它会崩溃.
3)选择项目时,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)
}
}
})
}
}
然后在详细视图控制器中：
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
...
}
}
EDIT2：
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 })
}
}
编辑方式3：我已经重写了sendEvent方法来跟踪用户是否正在触摸应用程序,但即使我拿出这段代码,它仍然会崩溃,然后调试器在UIApplicationMain上中断.
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()
}
}
}
}
}
}
解决方法
艰难的一点,对这个bug的事件有点了解可能会有所帮助.
>它是否会在每台设备上发生(如果没有,哪些设备会给您带来麻烦)
>它发生在“大力选择”项目之后.您的设备在此之前是否更改了方向.在你旋转之前它也会发生吗？
>当您“选择项目”时,您在代码中做什么.
除此之外,我开始在breakupFormerViewTree()中删除你的子ViewControllers.基于Apple Docs,你想告诉孩子它被删除,然后删除视图然后最终从Parent ViewController中删除子项
这里它实际上表示你想在删除之前调用willMovetoParentViewController(nil).它没有说明如果你不这样做会发生什么,但我可以想象操作系统在那里进行一些生命周期管理,防止它在以后发送腐败事件.
编辑(额外发布代码后)
我的代码中没有看到任何可能导致崩溃的内容.它确实看起来像你所说的内存错误,但不知道它来自何处.尝试打开Zombie对象和Guard Malloc(Scheme> Run> Diagnostics),也许你可以获得更多信息,了解导致它的原因.
除此之外,我只是注释掉你的实现的负载,用空的ViewControllers交换Subclasses,直到它不再发生.您应该能够确定创建此事件涉及实现的哪个部分.一旦你这样做,那就更好地指出并评估该实现中的每一行代码.
