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.o
ld: symbol(s) not found for architecture i386
collect2: 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