iPhone开发--Unresolved Symbols CAKeyframeAnimation : iOS Animation
我尝试这用CoreAnimation做一些动画效果，却在最后出现了如下的编译错误：
Undefined symbols for architecture i386: "_OBJC_CLASS_$_CAKeyframeAnimation", referenced from: objc-class-ref in SpellPageViewController.old: symbol(s) not found for architecture i386collect2: ld returned 1 exit status
解决方法：
检查你是否链接了QuartzCore库，如没有链接，请将其放到frameWork中。
原文地址：http://geoff.evason.name/2011/09/27/unresolved-symbols-cakeyframeanimation-ios-animation