iOS 越獄判斷

@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