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：

[plain]
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 

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。