IOS判断设备是否已越狱(isJailbroken)

@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