我是 Xcode 的新手，在使用 Interface Builder 时遇到了 IDE 崩溃的问题。这是 Xcode 4.5。
它可以正常工作足够长的时间，我可以在情节提要中添加十几个按钮 - 但是当我尝试调整其中任何一个按钮时，它会崩溃并退出。如果我移动一个按钮，它就会崩溃。如果我添加一个像标签这样的新对象，它有时会崩溃，但并非总是如此。
如果我不尝试编辑情节提要，项目将在模拟器上构建并运行，没有任何问题。
我在下面粘贴了看起来像是崩溃报告相关部分的内容。为了节省空间，我从“视图层次结构”部分向下删除了所有内容，但如果有用，我可以添加它。所有的崩溃报告都指向同一个错误。
有趣的是，当我查看控制台日志时，在每次崩溃之前，Interface Builder 都会提供另一份报告：
25/09/2012 10:46:35.661 Interface Builder Cocoa Touch Tool: CFPreferences:
user home directory at file://localhost/Users/me/Library/Application Support/
iPhone Simulator/User/ is unavailable. User domains will be volatile.
没错——那个目录不存在。我有 iPhone Simulator/6.0，但没有别的。我以该路径中的用户身份登录。
根据 Stack Overflow 和其他地方的其他建议，我尝试清理构建，然后删除整个 iPhone Simulator 目录并让模拟器重新创建它，但这没有区别。
作为一个实验，我刚刚创建了一个新项目并将一些按钮和标签拖到情节提要中。这似乎很好。没有崩溃。
这是否表明我的其他项目中的某些内容已损坏？
任何建议都会非常受欢迎。这不是一个重要的项目——我在这个阶段正在学习我的方法——但是如果有什么问题导致了问题，那么我想在我开始在 Xcode 中进行任何认真的工作之前解决它。
提前致谢。
詹姆士
Process: Xcode [650]
Path: /Applications/Xcode.app/Contents/MacOS/Xcode
Identifier: com.apple.dt.Xcode
Version: 4.5 (1839)
Build Info: IDEApplication-1839000000000000~3
App Item ID: 497799835
App External ID: 10747437
Code Type: X86-64 (Native)
Parent Process: launchd [129]
Date/Time: 2012-09-25 10:46:43.202 +0100
OS Version: Mac OS X 10.7.5 (11G56)
Report Version: 9
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Application Specific Information:
ProductBuildVersion: 4G182
ASSERTION FAILURE in /SourceCache/IDEInterfaceBuilderCocoaTouch/IDEInterfaceBuilderCocoaTouch-1926/IBPlugin/Utilities/IBObjectMarshalling.m:651
Details: Failed to arbitrate IBNSLayoutConstraint, IBUIButton, IBUILabel, IBUIView, and IBUIViewController.
Interface Builder encountered an error communicating with the iOS Simulator. If you choose to file a crash report or radar for this issue, please check Console.app for crash reports for "Interface Builder Cocoa Touch Tool" and include their content in your crash report.
Exception name: IBAssertionFailure
Exception reason: ASSERTION FAILURE:
Reason: All views needing candidate constraints have already had constraints generated. This most likely indicates a bug involving layout of the following views:
Layout engine frame ({{20, 60}, {282, 57}}) of <UILabel: 0xb36f590; frame = (20 60; 281 57); text = '0'; clipsToBounds = YES; opaque = NO; autoresize = TM+BM; userInteractionEnabled = NO; layer = <CALayer: 0xb36f620>> does not match canvas frame ({{20, 60}, {281, 57}})
Layout engine frame ({{236, 328}, {66, 43}}) of <UIRoundedRectButton: 0xb384590; frame = (236 328; 65 44); opaque = NO; autoresize = TM+BM; layer = <CALayer: 0xb384660>> does not match canvas frame ({{236, 328}, {65, 43}})
Layout engine frame ({{236, 124}, {66, 43}}) of <UIRoundedRectButton: 0xb38ea10; frame = (236 124; 65 44); opaque = NO; autoresize = TM+BM; layer = <CALayer: 0xb38eae0>> does not match canvas frame ({{236, 124}, {65, 43}})
Layout engine frame ({{236, 175}, {66, 43}}) of <UIRoundedRectButton: 0xb390a30; frame = (236 175; 65 44); opaque = NO; autoresize = TM+BM; layer = <CALayer: 0xb36e8e0>> does not match canvas frame ({{236, 175}, {65, 43}})
Layout engine frame ({{236, 226}, {66, 43}}) of <UIRoundedRectButton: 0xb392a90; frame = (236 226; 65 44); opaque = NO; autoresize = TM+BM; layer = <CALayer: 0xb392b60>> does not match canvas frame ({{236, 226}, {65, 43}})
Layout engine frame ({{236, 277}, {66, 43}}) of <UIRoundedRectButton: 0xb394b70; frame = (236 277; 65 44); opaque = NO; autoresize = TM+BM; layer = <CALayer: 0xb394c40>> does not match canvas frame ({{236, 277}, {65, 43}})