基础框架。没有 NSString.h 文件
在通过 SVN 更新工作副本后，我遇到了一些错误。
/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSCharacterSet.h:8:0 /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSCharacterSet.h:8:32: error: Foundation/NSString.h: No such file or directory
/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSCharacterSet.h:45:0 /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSCharacterSet.h:45: error: expected ')' before 'unichar'
/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSPathUtilities.h:10:0 /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSPathUtilities.h:10: error: cannot find interface declaration for 'NSString'
所有这些错误都表明编译器无法在 Foundation 框架中找到 NSString.h 文件，并且我已在 Xcode/Frameworks/Foundation.framework/Headers 中打开 Foundation 框架，并注意到那里没有 NSString 头文件。谁能告诉我发生了什么事吗？我尝试删除框架并再次添加它，但失败了。我仍然没有 NSString 头文件。
I'm getting a few errors just after I updated my working copy via SVN.
/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSCharacterSet.h:8:0 /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSCharacterSet.h:8:32: error: Foundation/NSString.h: No such file or directory
/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSCharacterSet.h:45:0 /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSCharacterSet.h:45: error: expected ')' before 'unichar'
/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSPathUtilities.h:10:0 /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSPathUtilities.h:10: error: cannot find interface declaration for 'NSString'
All that errors tell that compiler is unable to find NSString.h file in Foundation framework and I have opened the Foundation framework in Xcode/Frameworks/Foundation.framework/Headers and noticed that there is no NSString header file there. Could anyone tell me what happened? I tried to delete the framework and add it again but it failed to. Still I don't have NSString header file.
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我在 XCode 3 中启动的项目中遇到了这个问题，现在在 XCode 4 中编译，该行
被标记为没有这样的文件。我通过重新添加框架来修复它 - 尽管它已经出现在我的项目中（从我在 XCode 3 中添加它时开始），使用以下方法：
如何在 Xcode 4 中“添加现有框架”？
我注意到使用此方法看到的列表没有包括基础框架。
I had this problem in a project started in XCode 3 and now compiled in XCode 4, where the line
was flagged as no such file. I fixed it by re-adding the framework - although it was already appearing in my project (from when I had added it in XCode 3) using this approach:
How to "add existing frameworks" in Xcode 4?
I noticed the list seen by using this method did not include the Foundation framework.
尝试再次安装 XCode。不再支持较旧的 SDK 版本。选择 SDK 4.2 并重新编译。 （我已经复制了 SDK 4.0 以实现向后兼容性，但它没有显示在目标和项目设置中）
try installing XCode again. Older SDK versions are no longer supported. Choose SDK 4.2 instead and compile it again. (I have copied the SDK 4.0 for backward compatibility but it is not shown in targets and project settings)