iOS 越狱判断

@interface UIDevice (Helper)  
- (BOOL)isJailbroken;  
@end

@implementation UIDevice (Helper)  
- (BOOL)isJailbroken {  
  BOOL jailbroken = NO;  
  NSString *cydiaPath = @"/Applications/Cydia.app";  
  NSString *aptPath = @"/private/var/lib/apt/";  
  if ([[NSFileManager defaultManager] fileExistsAtPath:cydiaPath]) {  
    jailbroken = YES;  
  }  
  if ([[NSFileManager defaultManager] fileExistsAtPath:aptPath]) {  
    jailbroken = YES;  
  }  
  return jailbroken;  
}  

@end

http://blog.sina.com.cn/s/blog_50e0bce501013njm.html