尝试从didSelectItemAtIndexPath中的uilabel访问cellForItemAtIndexPath,但无法获取第一个单元格。这是我的代码

cellForItemAtIndexPath

UICollectionViewCell *cell=[collectionView dequeueReusableCellWithReuseIdentifier:@"Cell" forIndexPath:indexPath];
UILabel *featureName = [[UILabel alloc] initWithFrame:CGRectMake(5, 5, cell.frame.size.width-10, cell.frame.size.height-10)];
    featureName.tag = indexPath.row;
    [cell addSubview:featureName];


didSelectItemAtIndexPath

UICollectionViewCell *cell = [collectionView cellForItemAtIndexPath:indexPath];

UILabel *featureName = [cell viewWithTag:indexPath.row];
featureName.textColor = [UIColor lightGrayColor];


可以从所有单元格获得label.tag,但不能从第一个单元格获得。点击第一个单元格时,应用程序崩溃。

最佳答案

第一行的indexPath.row为0,但0不是有效标记。
我认为您应该只使用非零值。

尝试即

featureName.tag = indexPath.row + 1;

...

UILabel *featureName = [cell viewWithTag:indexPath.row+1];

08-19 12:28