在尝试将 Facebook SDK 安装到项目后，我在编译项目时遇到了问题。我已将代码恢复到之前的状态，但是我仍然收到与“ProcessPCH”相关的错误消息。我检查了目标设置，但仍然找不到此问题的任何解决方案。
错误代码如下所示：
ProcessPCH /Users/admin/Library/Developer/Xcode/DerivedData/AirFranceMusic-btdgsdavrzffuyaockrkcyvdacgq/Build/Intermediates/PrecompiledHeaders/AirFranceMusic-Prefix-acpjajeiwlvgzwgddsqkamtwztjy/AirFranceMusic-Prefix.pch.pth AirFranceMusic/AirFranceMusic-Prefix.pch normal i386 objective-c com.apple.compilers.llvm.clang.1_0.compiler
cd /Users/admin/Documents/AirFranceMusic/src
setenv LANG en_US.US-ASCII
setenv PATH "/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -x objective-c-header -arch i386 -fmessage-length=0 -std=gnu99 -fobjc-arc -Wno-trigraphs -fpascal-strings -O0 -Wno-missing-field-initializers -Wno-missing-prototypes -Wreturn-type -Wno-implicit-atomic-properties -Wno-receiver-is-weak -Wformat -Wno-missing-braces -Wparentheses -Wswitch -Wno-unused-function -Wno-unused-label -Wno-unused-parameter -Wunused-variable -Wunused-value -Wuninitialized -Wno-unknown-pragmas -Wno-shadow -Wno-four-char-constants -Wno-conversion -Wno-sign-compare -Wno-shorten-64-to-32 -Wpointer-sign -Wno-newline-eof -Wno-selector -Wno-strict-selector-match -Wno-undeclared-selector -Wno-deprecated-implementations -DDEBUG=1 -DDEBUG=1 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.1.sdk -fexceptions -fasm-blocks -Wprotocol -Wdeprecated-declarations -mmacosx-version-min=10.6 -g -Wno-sign-conversion -fobjc-abi-version=2 -fobjc-legacy-dispatch "-DIBOutlet=__attribute__((iboutlet))" "-DIBOutletCollection(ClassName)=__attribute__((iboutletcollection(ClassName)))" "-DIBAction=void)__attribute__((ibaction)" -D__IPHONE_OS_VERSION_MIN_REQUIRED=40000 -I/Users/admin/Library/Developer/Xcode/DerivedData/AirFranceMusic-btdgsdavrzffuyaockrkcyvdacgq/Build/Intermediates/AirFranceMusic.build/Debug-iphonesimulator/AirFranceMusic.build/AirFranceMusic.hmap -I/Users/admin/Library/Developer/Xcode/DerivedData/AirFranceMusic-btdgsdavrzffuyaockrkcyvdacgq/Build/Products/Debug-iphonesimulator/include -I/Users/admin/Library/Developer/Xcode/DerivedData/AirFranceMusic-btdgsdavrzffuyaockrkcyvdacgq/Build/Intermediates/AirFranceMusic.build/Debug-iphonesimulator/AirFranceMusic.build/DerivedSources/i386 -I/Users/admin/Library/Developer/Xcode/DerivedData/AirFranceMusic-btdgsdavrzffuyaockrkcyvdacgq/Build/Intermediates/AirFranceMusic.build/Debug-iphonesimulator/AirFranceMusic.build/DerivedSources -F/Users/admin/Library/Developer/Xcode/DerivedData/AirFranceMusic-btdgsdavrzffuyaockrkcyvdacgq/Build/Products/Debug-iphonesimulator -F/Users/admin/Documents/AirFranceMusic/src --serialize-diagnostics /Users/admin/Library/Developer/Xcode/DerivedData/AirFranceMusic-btdgsdavrzffuyaockrkcyvdacgq/Build/Intermediates/PrecompiledHeaders/AirFranceMusic-Prefix-acpjajeiwlvgzwgddsqkamtwztjy/AirFranceMusic-Prefix.pch.dia -c /Users/admin/Documents/AirFranceMusic/src/AirFranceMusic/AirFranceMusic-Prefix.pch -o /Users/admin/Library/Developer/Xcode/DerivedData/AirFranceMusic-btdgsdavrzffuyaockrkcyvdacgq/Build/Intermediates/PrecompiledHeaders/AirFranceMusic-Prefix-acpjajeiwlvgzwgddsqkamtwztjy/AirFranceMusic-Prefix.pch.pth -MMD -MT dependencies -MF /Users/admin/Library/Developer/Xcode/DerivedData/AirFranceMusic-btdgsdavrzffuyaockrkcyvdacgq/Build/Intermediates/PrecompiledHeaders/AirFranceMusic-Prefix-acpjajeiwlvgzwgddsqkamtwztjy/AirFranceMusic-Prefix.pch.d
In file included from /Users/admin/Documents/AirFranceMusic/src/AirFranceMusic/AirFranceMusic-Prefix.pch:20:
In file included from /Users/admin/Documents/AirFranceMusic/src/AirFranceMusic/../../libs/MKNetworkKit/MKNetworkKit.h:52:
/Users/admin/Documents/AirFranceMusic/src/AirFranceMusic/../../libs/MKNetworkKit/Categories/NSString+MKNetworkKitAdditions.h:26:1: error: missing '@end'
@interface NSString (MKNetworkKitAdditions)
^
@end
/Users/admin/Documents/AirFranceMusic/src/AirFranceMusic/AppDelegate.h:16:1: note: class started here
@interface AppDelegate : UIResponder <UIApplicationDelegate, UITabBarControllerDelegate>
^
In file included from /Users/admin/Documents/AirFranceMusic/src/AirFranceMusic/AirFranceMusic-Prefix.pch:20:
In file included from /Users/admin/Documents/AirFranceMusic/src/AirFranceMusic/../../libs/MKNetworkKit/MKNetworkKit.h:52:
/Users/admin/Documents/AirFranceMusic/src/AirFranceMusic/../../libs/MKNetworkKit/Categories/NSString+MKNetworkKitAdditions.h:26:21: error: method type specifier must start with '-' or '+'
@interface NSString (MKNetworkKitAdditions)
^
/Users/admin/Documents/AirFranceMusic/src/AirFranceMusic/../../libs/MKNetworkKit/Categories/NSString+MKNetworkKitAdditions.h:26:22: error: expected a type
@interface NSString (MKNetworkKitAdditions)
^
/Users/admin/Documents/AirFranceMusic/src/AirFranceMusic/../../libs/MKNetworkKit/Categories/NSString+MKNetworkKitAdditions.h:28:1: error: expected selector for Objective-C method
- (NSString *) md5;
^
4 errors generated.
如果有人对此有解决方案，将不胜感激。
问题现已解决。虽然我对自己造成这个问题并不感到自豪，但我很高兴它得到了解决。
就我而言，我不小心注释掉了 AppDelegate 头文件的 @end，导致 XCode 项目完全构建失败。
我仍然非常不确定为什么它会说我的失败与 MKNetworkKit 中的一个文件有关，但我只能建议您检查所有文件是否存在类似这样的常见错误，如果清理构建/派生数据不起作用工作。重新安装XCode绝对不是一个理想的解决方案。