架构armv7s找不到符号（链接器命令失败，退出代码为1）

Question

当我为IOS7构建Xcode 5时，我收到此错误：

Undefined symbols for architecture armv7s:
  "_OBJC_CLASS_$_CIFilter", referenced from:
      objc-class-ref in UIImage+Filter.o
  "_kCIInputImageKey", referenced from:
      -[UIImage(Filter) filterWithPreset:] in UIImage+Filter.o
  "_OBJC_CLASS_$_CIImage", referenced from:
      objc-class-ref in UIImage+Filter.o
  "_OBJC_CLASS_$_CIContext", referenced from:
      objc-class-ref in UIImage+Filter.o
ld: symbol(s) not found for architecture armv7s
clang: error: linker command failed with exit code 1 (use -v to see invocation)

我注意到如果删除UIImage + Filter.h / m文件和UIImageView + Filter.h / m

，错误就会消失

Answer 1

简单...确保导入CoreImage框架