How to fix a linker error when I try to use CIFilter in an iOS application (iPhone)?

Question

I get the following link error:

Undefined characters for armv7 architecture: "_OBJC_CLASS _ $ _ CIFilter" referenced: objc-class-ref in CameraViewController.o "_OBJC_CLASS _ $ _ CIImage" referenced: objc-class-ref in CameraViewController.o ld: character not found for armv7 clang architecture: error: linker command did not work with exit code 1 (use -v to call the call)

I have already included QuartzCore.framework.

Answer 1

Do you need a library /Frameworks/CoreImage.framework

http://developer.apple.com/library/ios/#DOCUMENTATION/GraphicsImaging/Reference/QuartzCoreFramework/Classes/CIImage_Class/Reference/Reference.html