_kCATransitionFade", referenced from:
_kCATransitionFade$non_lazy_ptr in ViewTransitionsAsViewControllerViewController.o
(maybe you meant: _kCATransitionFade$non_lazy_ptr)
最近朋友碰到这个问题，是相应的framework没有add 近工程里的原因。只需把相应包add进来就行啦 。
xcode 4 add方法见http://blog.csdn.net/top123xcode/article/details/6629354