当从不同的故事板上复制/粘贴视图时，Xcode 11崩溃

Question

我在Catalina上运行的Xcode 11有问题（与Moave相同）。当我尝试将视图或ViewController从一个故事板复制/粘贴到另一个Xcode时发生崩溃，但出现以下异常：

...
Exception Type:        EXC_CRASH (SIGABRT)
Exception Codes:       0x0000000000000000, 0x0000000000000000
Exception Note:        EXC_CORPSE_NOTIFY

Application Specific Information:
Sending paste: to IBStructureAreaDockView from <NSMenuItem: 0x7fe24030ddd0 Paste>
ProductBuildVersion: 11A1027
ASSERTION FAILURE in /Library/Caches/com.apple.xbs/Sources/IDEInterfaceBuilder/IDEInterfaceBuilder-15400/InterfaceBuilderKit/WidgetIntegration/View/IBViewIntegration.m:2451
Details:  There should only be 1 parent of all the constraint items extracted from the pasteboard: {(
)}
Object:   <IBUIView: 0x7fe23db1c600>
Method:   -ibDidExtractObjects:fromPasteboard:intoDocument:context:
Thread:   <NSThread: 0x7fe23ac17e80>{number = 1, name = main}
Hints:   
  0: Sending paste: to IBStructureAreaDockView from <NSMenuItem: 0x7fe24030ddd0 Paste>
Backtrace:
  0   -[IDEAssertionHandler handleFailureInMethod:object:fileName:lineNumber:assertionSignature:messageFormat:arguments:] (in IDEKit)
  1   _DVTAssertionHandler (in DVTFoundation)
  2   _DVTAssertionFailureHandler (in DVTFoundation)
  3   -[NSView(IBViewIntegration) ibDidExtractObjects:fromPasteboard:intoDocument:context:] (in IDEInterfaceBuilderKit)
  4   -[IBUIView(IBUIViewIntegration) ibDidExtractObjects:fromPasteboard:intoDocument:context:] (in IDEInterfaceBuilderCocoaTouchIntegration)
  5   -[IBDocument ibDidExtractObjects:fromPasteboard:context:] (in IDEInterfaceBuilderKit)
  6   -[IBDocument insertObjectsFromPasteboard:ofType:asChildrenOfObject:atIndex:context:finishExtractingObjectsBlock:] (in IDEInterfaceBuilderKit)
  7   -[IBDocument insertOrMoveChildrenFromPasteboard:ofType:asChildrenOfObject:atIndex:context:finishExtractingObjectsBlock:] (in IDEInterfaceBuilderKit)
  8   -[IBDocument addOrMoveChildrenFromPasteboard:ofType:toObject:context:finishExtractingObjectsBlock:] (in IDEInterfaceBuilderKit)
  9   -[IBStoryboardDocument addOrMoveChildrenFromPasteboard:ofType:toSceneGroup:context:] (in IDEInterfaceBuilderKit)
 10   -[IBSceneDockViewController performDockPasteWithPasteboard:context:] (in IDEInterfaceBuilderKit)
 11   -[IBSceneDockViewController dockViewPerformPaste:] (in IDEInterfaceBuilderKit)
 12   -[IBStructureAreaDockView paste:] (in IDEInterfaceBuilderKit)
 13   -[NSApplication(NSResponder) sendAction:to:from:] (in AppKit)
 14   __37-[DVTApplication sendAction:to:from:]_block_invoke.86 (in DVTKit)
 15   DVTInvokeWithFailureHint (in DVTFoundation)
 16   -[DVTApplication sendAction:to:from:] (in DVTKit)
 17   -[NSMenuItem _corePerformAction] (in AppKit)
 18   -[NSCarbonMenuImpl performActionWithHighlightingForItemAtIndex:] (in AppKit)
 19   -[NSMenu performKeyEquivalent:] (in AppKit)
 20   routeKeyEquivalent (in AppKit)
 21   -[NSApplication(NSEvent) sendEvent:] (in AppKit)
 22   -[IDEApplication sendEvent:] (in IDEKit)
 23   -[NSApplication run] (in AppKit)
 24   NSApplicationMain (in AppKit)
 25   main (in Xcode)
 26   start (in libdyld.dylib)

Performing @selector(paste:) from sender NSMenuItem 0x7fe24030ddd0
abort() called

Application Specific Signatures:
[parentsOfItemsInConstraints count] == 1
...

这是发生在别人身上吗？故事板不支持此功能吗？

Answer 1

我的问题是因为我的应用程序在后台运行。关闭模拟器后，我能够复制/剪切和粘贴（即使在不同的故事板文件中）。

Answer 2

Xcode->Preferences-Locations 单击“Derived Data”下方的小箭头并删除该文件夹。完成此操作后，我可以在故事板之间进行剪切和粘贴。

Answer 3

同样的问题在这里。我认为这是新Xcode 11的错误。

找到了一个快速的解决方法。不必复制和粘贴会导致Xcode崩溃的视图控制器，您可以使用cmd + D复制视图控制器。但这仅在同一个情节提要中有用

Answer 4

我找到了一个快速破解方法，转到您的项目导航器，然后右键单击您的 .storyboard 文件并选择作为源代码打开。

您将获得 xml 格式的情节提要，搜索并复制控制器的类，然后按照在其他情节提要中复制它的方式进行粘贴。确保获取视图控制器的完整代码。

            <!--Detail View Controller-->
    <scene sceneID="n6l-mp-H1E"> .... </scene>