theos默认是不启用arc的。
如果要启用，看这个 http://iphonedevwiki.net/index.php/Using_ARC_in_tweaks
How do I use ARC in tweaks?
Using theos (limited)
In your Makefile:
TweakName_CFLAGS = -fobjc-arc
Please note that this applies ARC to all files you are compiling including your tweak file.