UICollectionView Header 和Footer

@interface FooterView : UICollectionReusableView

Footer  和 Header  基于  UICollectionReusableView

重用標識

static NSString * headeridentifier = @"header";
static NSString * footeridentifier = @"FOOTER";

  注冊重用標識符

     第一個參數 : 返回的view類型
     第二個參數: 設置view的種類 (header , footer)
     第三個參數: 設置重用標識符
    
    [cView registerClass:[HeaderView class] forSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:headeridentifier];
   

    [cView registerClass:[FooterView class] forSupplementaryViewOfKind:UICollectionElementKindSectionFooter withReuseIdentifier:footeridentifier];

Header 和 Footer 重用

- (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath
{
  if ([kind isEqualToString:UICollectionElementKindSectionHeader]) {
    
    HeaderView * headerView = [collectionView dequeueReusableSupplementaryViewOfKind:kind withReuseIdentifier:headeridentifier forIndexPath:indexPath];
    headerView.backgroundColor = [UIColor whiteColor];
    headerView.label.text = @"header";
    headerView.label.textAlignment = NSTextAlignmentCenter;
    
     return headerView;
  }
 
    
    FooterView * footerView = [collectionView dequeueReusableSupplementaryViewOfKind:kind withReuseIdentifier:footeridentifier forIndexPath:indexPath];
    footerView.backgroundColor = [UIColor whiteColor];
    footerView.label.text = @"footer";
    footerView.label.textAlignment = NSTextAlignmentCenter;
    
    
    return footerView;
    
}