Undefined symbols for architecture i386:

  "_OBJC_CLASS_$_CATransition", referenced from:

      objc-class-ref in RootViewController.o

  "_kCATransitionFromLeft", referenced from:

      -[RootViewController setPage] in RootViewController.o

  "_kCATransitionFromRight", referenced from:

      -[RootViewController setPage] in RootViewController.o

  "_kCATransitionPush", referenced from:

      -[RootViewController setPage] in RootViewController.o

ld: symbol(s) not found for architecture i386

clang: error: linker command failed with exit code 1 (use -v to see invocation)

原因是少加了包 “ QuartzCore.framework”