ios-在uicollectionview的底部添加加载指示器 [英] ios - add loading indicator at the bottom of uicollectionview

问题描述

是否有内置支持将加载程序"(UIActivityIndi​​cator)添加到uicollectionview，这样，每次用户滚动到最后一个数据单元时，他都会看到带有加载指示器的另一个水平子视图吗?

in iOS is there any built in support for adding a "loader" (UIActivityIndicator) to a uicollectionview, such that every time a user scroll to the last cell of data he'll see another horizontal subview with the loading indicator?

推荐答案

不，没有内置"方式.您需要做的是增加一个包含加载程序的单元格.检测何时显示此单元格是很简单的，此时您可以开始调用以加载更多数据.

No, there's no "built in" way. What you'd need to do is have an extra cell that contains a loader. It's fairly trivial to detect when this cell appears, at which point you can start the call to load more data.

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
   return [data count] + 1;
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
   UICollectionViewCell *cell;

   if (indexPath.item < [data count])
   {
      cell = ...; // regular cell
   }
   else
   {
      cell = ...; // cell with loading indicator
   }

   return cell;
}

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