滚动后ios UICollectionView单元格没有刷新

Question

我有一个基本的UICollectionView，如果我滚动将“重绘”单元格顶部的标签，

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


    UICollectionViewCell *cell=[collectionView dequeueReusableCellWithReuseIdentifier:@"cellIdentifier" forIndexPath:indexPath];


    cell.backgroundColor=[UIColor greenColor];

    UILabel *title = [[UILabel alloc]initWithFrame:CGRectMake(0, 10, cell.bounds.size.width, 40)];
    [cell.contentView addSubview:title];

    //NSString *titleLbl = [NSString stringWithFormat:@"i = %d", indexPath.row];


    title.text = [self.arraya objectAtIndex:indexPath.row];

    return cell;
}

如何修复它以便在滚动后刷新正确的单元格？ 干杯

Answer 1

执行此操作时：

UILabel *title = [[UILabel alloc]initWithFrame:CGRectMake(0, 10, cell.bounds.size.width, 40)];
[cell.contentView addSubview:title];

您每次都会创建一个新标题并将其添加到您的contentView。相反，尝试在UILabel中添加标签并更改现有的UILabel文本，如下所示：

UILabel *title = (UILabel *)[cell.contentView viewWithTag:SOME_NUMBER];
if (!title) {
    title = [[UILabel alloc]initWithFrame:CGRectMake(0, 10, cell.bounds.size.width, 40)];
    title.tag = SOME_NUMBER;
    [cell.contentView addSubview:title];
}
title.text = @"your new text"