ios - collectionview 自定义单元格没有出现

Question

我使用自定义单元格创建 collectionview 并且它工作正常，但是当我在应用程序中更新时它不起作用，我不知道为什么。

[self.collectionView registerClass:[CellItem class] forCellWithReuseIdentifier:@"CellItem"];
[self.collectionView setDataSource:self];
[self.collectionView setDelegate:self];

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    CellItem* cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"CellItem"
                                                           forIndexPath:indexPath];
   //cell.backgroundColor = [UIColor redColor];
   NSDictionary* celldata = [productsDictionary objectAtIndex:indexPath.row];
   NSString* productName = [celldata objectForKey:@"name"];
   NSString* productImage = [celldata objectForKey:@"image"];

   dispatch_async(dispatch_get_global_queue(0,0), ^{

    NSData * data = [[NSData alloc] initWithContentsOfURL: [NSURL URLWithString: productImage]];
      if (data == nil)
        return;
      dispatch_async(dispatch_get_main_queue(), ^{

        // WARNING: is the cell still using the same data by this point??

       cell.imageViewProduct.image = [UIImage imageWithData: data];

        //cell.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageWithData: data]];
      });
  });
  [cell.lableTitle setText:productName];
  return cell;
}

对于 itemcell 类:

@property (weak, nonatomic) IBOutlet UITextView *lableTitle;

@property (weak, nonatomic) IBOutlet UIImageView *imageViewProduct;

这里的输出图像: http://i.stack.imgur.com/bcZaw.jpg

Answer 1

请尝试删除

[self.collectionView registerClass:[CellItem class] forCellWithReuseIdentifier:@"CellItem"];

您使用的是自定义 UICollectionViewCell，因此您不应使用 registerClass