导入PCH文件之后报错unknown type name 'NSString'

导入PCH文件之后报错,找不到NSString,UIKit,Foundation等,报错:

error: expected identifier or '('

@class NSString, Protocol;

/Applications/XCode8.1/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator10.1.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:494:9: error: unknown type name 'NSString'

typedef NSString * NSExceptionName NS_EXTENSIBLE_STRING_ENUM;

typedef NSString * NSRunLoopMode NS_EXTENSIBLE_STRING_ENUM;

FOUNDATION_EXPORT NSString *NSStringFromSelector(SEL aSelector);

FOUNDATION_EXPORT SEL NSSelectorFromString(NSString *aSelectorName);

FOUNDATION_EXPORT NSString *NSStringFromClass(Class aClass);

FOUNDATION_EXPORT Class _Nullable NSClassFromString(NSString *aClassName);

FOUNDATION_EXPORT NSString *NSStringFromProtocol(Protocol *proto) NS_AVAILABLE(10_5, 2_0);

In module 'ObjectiveC' imported from /Applications/XCode8.1/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator10.1.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:9:

/Applications/XCode8.1/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator10.1.sdk/usr/include/objc/runtime.h:78:28: note: previous declaration is here

typedef struct objc_object Protocol;

While building module 'UIKit' imported from /Users/cbwl/Library/Developer/Xcode/DerivedData/BBJD-dimoovxwuxypokadrohgluegljkb/Build/Products/Debug-iphonesimulator/SDAutoLayout/SDAutoLayout.framework/Headers/UIView+SDAutoLayout.h:55:

While building module 'Foundation' imported from /Applications/XCode8.1/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator10.1.sdk/System/Library/Frameworks/UIKit.framework/Headers/UIAccelerometer.h:8:

In file included from :1:

In file included from /Applications/XCode8.1/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator10.1.sdk/System/Library/Frameworks/Foundation.framework/Headers/Foundation.h:8:

FOUNDATION_EXPORT Protocol * _Nullable NSProtocolFromString(NSString *namestr) NS_AVAILABLE(10_5, 2_0);

FOUNDATION_EXPORT void NSLog(NSString *format, ...) NS_FORMAT_FUNCTION(1,2) NS_NO_TAIL_CALL;

~~~~~~~~~~~~~~~~^~

#define NS_FORMAT_FUNCTION(F,A) __attribute__((format(__NSString__, F, A)))

FOUNDATION_EXPORT void NSLogv(NSString *format, va_list args) NS_FORMAT_FUNCTION(1,0) NS_NO_TAIL_CALL;

~~~~~~~~~~~~~~~~^~

#define NS_FORMAT_FUNCTION(F,A) __attribute__((format(__NSString__, F, A)))

/Applications/XCode8.1/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator10.1.sdk/usr/include/objc/module.map:8:10: error: module 'ObjectiveC.NSObject' requires feature 'objc'

解决:

在PCH中添加#ifdef ObjectC,即可解决

导入PCH文件之后报错unknown type name 'NSString'

解决:

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