Objective c Apple Mach-o链接（Id）错误架构i386 AppDelegate.o的未定义符号

嗨，我已经有这个问题很长时间了，它让我发疯

Ld /Users/soc/Library/Developer/Xcode/DerivedData/friendSpotted-dohwbjpnqfiztkcphlehsjqjusjk/Build/Products/Debug-iphonesimulator/friendSpotted.app/friendSpotted normal i386
    cd /Users/soc/Desktop/friendSpotted
    setenv MACOSX_DEPLOYMENT_TARGET 10.6
    setenv PATH "/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
    /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/clang -arch i386 -isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.0.sdk -L/Users/soc/Library/Developer/Xcode/DerivedData/friendSpotted-dohwbjpnqfiztkcphlehsjqjusjk/Build/Products/Debug-iphonesimulator -F/Users/soc/Library/Developer/Xcode/DerivedData/friendSpotted-dohwbjpnqfiztkcphlehsjqjusjk/Build/Products/Debug-iphonesimulator -filelist /Users/soc/Library/Developer/Xcode/DerivedData/friendSpotted-dohwbjpnqfiztkcphlehsjqjusjk/Build/Intermediates/friendSpotted.build/Debug-iphonesimulator/friendSpotted.build/Objects-normal/i386/friendSpotted.LinkFileList -mmacosx-version-min=10.6 -Xlinker -objc_abi_version -Xlinker 2 -Xlinker -no_implicit_dylibs -D__IPHONE_OS_VERSION_MIN_REQUIRED=50000 -framework MobileCoreServices -framework UIKit -framework Foundation -framework CoreGraphics -o /Users/soc/Library/Developer/Xcode/DerivedData/friendSpotted-dohwbjpnqfiztkcphlehsjqjusjk/Build/Products/Debug-iphonesimulator/friendSpotted.app/friendSpotted

Undefined symbols for architecture i386:
  "_OBJC_CLASS_$_ViewController", referenced from:
      objc-class-ref in AppDelegate.o
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)

这真的让我陷入了死胡同，我在这个网站上尝试了一些解决方案，但都没有用。我已经检查了viewController.m，看看它是否针对正确的项目，就我所知，我已经添加了所有正确的框架。见下文：

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我确实需要帮助，我将非常感谢。

似乎您没有包括一些框架。看起来您的viewcontroller.m文件实际上是在声明一个cameraViewController类，而不是ViewControllerHanks Fred，这似乎是问题所在，我刚刚将名称改回viewcontroller。再次感谢！