objective-c - 无法在 UICollectionView 单元格上创建底部边框

Question

我需要为我的 UICollectionView 单元格添加一个 1px 的底部边框，但我无法让它工作，我尝试了以下代码，但边框没有显示:

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    CollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:reuseIdentifier forIndexPath:indexPath];


    // Configure the cell
    cell.backgroundColor = [UIColor whiteColor];
    cell.titolo.text = arrayt[prova];

    //create the border
    UIView *bottomBorder = [[UIView alloc] initWithFrame:CGRectMake(0, cell.frame.size.height, cell.frame.size.width, 1)];
    bottomBorder.backgroundColor = [UIColor redColor];

    [cell.contentView addSubview:bottomBorder];


    return cell;
}

可能是什么问题？

CGRectMake 获取 (x,y,width,height) 作为参数，所以我无法理解我的代码有什么问题

Answer 1

你需要有正确的y偏移量

//create the border
    UIView *bottomBorder = [[UIView alloc] initWithFrame:CGRectMake(0, cell.frame.size.height - 1, cell.frame.size.width, 1)];
    bottomBorder.backgroundColor = [UIColor redColor];