Unity ARKit Objective C Apple Mach-O Linked (Id) Error

Question

I'm working on a QR reader for a Unity 2017.2 ARkit project and I have run into some trouble trying to build my project with X Code 9.0. The error message is an Apple Mach-O Linker

I've haven't written my objective C project yet, but have ran into some trouble with the CIImage.

#import <Foundation/Foundation.h>

//static float qrcodeBounds[8];
static volatile BOOL reading = false;

void ReadQRCode(long long mtlTexPtr)
{
   if (reading) return;
   reading = YES;

   MTLTextureRef mtlTex = (__bridge MTLTextureRef)(void*)mtlTexPtr;
   CIImage *ciImage = [CIImage imageWithMTLTexture:mtlTex options:nil];
}

void GetQRCodeBounds(int32_t **boundsPtr){ 

}

The error which I get is an Undefined symbol for architecture arm64:

Has anyone else had this problem?

Answer 1

You are probably missing a framework, that requires this. Try to add coreImage framework

Answer 2

Apple documentation says that that CIImage class is declared in CoreImage framework. So you need to add this framework to your project if you didn't. If you have CoreImage framework imported to your project try adding #import <CoreImage/CoreImage.h> to your source file where you use CIImage