ios资源文件加密保护

• (NSSet *)certificatesInBundle:(NSBundle *)bundle {
  NSArray *paths = [bundle pathsForResourcesOfType:@"cer" inDirectory:@"."];

  NSMutableSet *certificates = [NSMutableSet setWithCapacity:[paths count]];
  for (NSString *path in paths) {
  NSData *certificateData = [NSData dataWithContentsOfFile:path];
  [certificates addObject:certificateData];
  }

  return [NSSet setWithSet:certificates];
  }