阻止文件被iTunes和iCloud同步

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+ (BOOL)addSkipBackupAttributeToItemAtPath:(NSString *)path {
  BOOL success = NO;

  const char *filePath = [path fileSystemRepresentation];
  const char *attrName = "com.apple.MobileBackup";

  void *check = (void *)&NSURLIsExcludedFromBackupKey;
  if (check != NULL) {
    // First try and remove the extended attribute if it is present
    int result = getxattr(filePath, attrName, NULL, sizeof(u_int8_t), 0, 0);
    if (result != -1) {
      // The attribute exists, we need to remove it
      int removeResult = removexattr(filePath, attrName, 0);
      if (removeResult == 0) {
        NSLog(@"Removed extended attribute on item at path %@", path);
      }
    }
    NSURL *url = [NSURL fileURLWithPath:path];
    success = [url setResourceValue:[NSNumber numberWithBool:YES]
                             forKey:NSURLIsExcludedFromBackupKey
                              error:nil];
  } else {
    // iOS 5.0.1 and lower
    u_int8_t attrValue = 1;
    int result =
        setxattr(filePath, attrName, &attrValue, sizeof(attrValue), 0, 0);
    success = (result == 0);
  }
  NSLog(@"Add skip backup attribute for item at path: %@, result: %d", path,
        success);
  return success;
}