combination avatar or Discussion group head
- Usage
NSMutableArray *avatars = [[NSMutableArray alloc] initWithCapacity:0];
[avatars addObject:[UIImage imageNamed:@"000"]];
HJCombinationAvatar combinationAvatar = [HJCombinationAvatar combinationAvatarWithFrame:rect images:avatars];
[self.view addSubview:combinationAvatar];