注意：
1. CollectionView 的头标题位置 和 他的 滚动 方向 相关
2.一定要 注册 头标题
3. 在初始化Layout 的时候 设置 flowLayout.headerReferenceSize = CGSizeMake(JKScreenWidth, 23);
不然不显示

不多说，直接 上 代码

创建：

pragma mark - 组织成员 CollectionView

• (void)setupMemberCollectionView{

  UICollectionViewFlowLayout * flowLayout = [[UICollectionViewFlowLayout alloc] init];
  //根据自己的需求设置宽高
  [flowLayout setItemSize:CGSizeMake(40, 40)];
  //水平滑动
  [flowLayout setScrollDirection:UICollectionViewScrollDirectionVertical];
  //内边距，列、行间距
  flowLayout.sectionInset = UIEdgeInsetsMake(0,0,0,0);
  flowLayout.minimumInteritemSpacing = 12;
  flowLayout.minimumLineSpacing = 12;
  flowLayout.headerReferenceSize = CGSizeMake(JKScreenWidth, 23);

  UICollectionView * memberCollectionView = [[UICollectionView alloc] initWithFrame:CGRectMake(0, 0, JKScreenWidth, 100) collectionViewLayout:flowLayout];
  memberCollectionView.translatesAutoresizingMaskIntoConstraints = NO;
  [self addSubview:memberCollectionView];

  [memberCollectionView mas_makeConstraints:^(MASConstraintMaker *make) {

    make.top.equalTo(_managerCollectionView.mas_bottom).mas_equalTo(20);
    make.left.equalTo(_managerCollectionView);
    make.right.mas_equalTo(0);
    make.height.mas_equalTo(64);
  

  }];
  memberCollectionView.delegate = self;
  memberCollectionView.dataSource = self;
  memberCollectionView.bounces = NO;
  memberCollectionView.scrollEnabled = NO;
  memberCollectionView.showsHorizontalScrollIndicator = NO;
  memberCollectionView.backgroundColor = [UIColor whiteColor];
  self.memberCollectionView = memberCollectionView;

}

注册：

pragma mark - 注册

• (void)registerCollectionViewCell{

  [_managerCollectionView registerClass:[RSMeGroupDetailsCollectionViewCell class] forCellWithReuseIdentifier:croupDetailsIdentifier];

  [_managerCollectionView registerClass:[RSMeGroupDetailsCollectionReusableView class] forSupplementaryViewOfKind:@"UICollectionElementKindSectionHeader" withReuseIdentifier:reusableViewIdentifier];

[_memberCollectionView registerClass:[RSMeGroupDetailsCollectionViewCell class] forCellWithReuseIdentifier:croupDetailsIdentifier];

[_memberCollectionView registerClass:[RSMeGroupDetailsCollectionReusableView class] forSupplementaryViewOfKind:@"UICollectionElementKindSectionHeader" withReuseIdentifier:reusableViewIdentifier];

}

代理： 在代理 方法 设置 头视图 或者 脚视图

• (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath{

   RSMeGroupDetailsCollectionReusableView *headerView = [collectionView dequeueReusableSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:reusableViewIdentifier forIndexPath:indexPath];
  

  if (collectionView == _managerCollectionView) {
  headerView.nameLabel.text = @"管理员";
  }else if(collectionView == _memberCollectionView){

      headerView.nameLabel.text = @"组织成员";
  

  }

  return headerView;

}