On May 10, 2011, at 3:34 AM, Brian Bruinewoud wrote:

> But this doesn't link because the CADisplayLink class is missing:
> 
>    displayLink = [CADisplayLink                       displayLinkWithTarget: 
> tapped selector:@selector(respond:)];
> 
> ??
> 
> Link error is:
> 
> Undefined symbols for architecture i386:
>  "_OBJC_CLASS_$_CADisplayLink", referenced from:
>      objc-class-ref in drawingViewController.o
> ld: symbol(s) not found for architecture i386
> collect2: ld returned 1 exit status


These types of link errors typically indicate that you forgot to link a 
necessary framework, in this case QuartzCore.framework.
--
David Duncan

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