How do I resolve the linker error when I try to use CIFilter in my iOS (iPhone) app?

Question

I get the following link error:

Undefined symbols for architecture armv7: "_OBJC_CLASS_$_CIFilter", referenced from: objc-class-ref in CameraViewController.o "_OBJC_CLASS_$_CIImage", referenced from: objc-class-ref in CameraViewController.o ld: symbol(s) not found for architecture armv7 clang: error: linker command failed with exit code 1 (use -v to see invocation)

I already have included the QuartzCore.framework.

Answer 1

You need Library/Frameworks/CoreImage.framework

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