带有两个自定义单元格的 UITableView(多个标识符) [英] UITableView with two custom cells (multiple identifiers)

问题描述

我试图将一个单元格作为每个单元格之间的空格 - 这将通过设置 alpha = 0 来隐藏.在我的表格中，空格单元格将用于奇数行.

I am trying to put a cell as a space between each cell - which will be hidden by setting alpha = 0. In my table, the space cells will be for rows that are odd.

注意实际单元格高度为85，但隐藏单元格高度(即单元格间距)为20.

Note that the actual cell height is 85, but the hidden cell height (ie space between cells) is 20.

问题是空间单元高度是85，不是20，不知道为什么.可能单元格加载不正确.

The problem is that the space cell height is 85, but not 20, I don't know why. Maybe the cell is not loaded correctly.

Cell 这里是 UITableViewCell - 实际的单元格 - 带有标识符Cell".

Cell here is the UITableViewCell - the actual cell - with identifier 'Cell'.

Cell2 是标识符为Space"的空间.

Cell2 is the space with identifier 'Space'.

上面的每个类都有自己的 UITableViewCell 类，并且还为每个类分配了 XIB 文件.标识符也在 IB 中为每个 Xib 设置.

Each class above has its own UITableViewCell class and the XIB files are also assigned to each of them. The identifier is also set in the IB for each Xib.

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier1 = @"Cell";
static NSString *CellIdentifier2 = @"Space";

Cell *cell = (Cell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier1];

if(!cell)
{
    NSArray *ar = [[NSBundle mainBundle] loadNibNamed:@"CellView" owner:nil options:nil];
    for (id obj in ar)
    {
        if ([obj isKindOfClass:[Cell class]])
        {
            cell = (Cell *)obj;
            break;
        }
    }
}

if (indexPath.row % 2 == 1)
{
    Cell2 *cell2 = (Cell2 *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier2];

    if (!cell2)
    {
        NSArray *ar = [[NSBundle mainBundle] loadNibNamed:@"Cell2" owner:nil options:nil];
        for(id obj in ar)
        {
            if([obj isKindOfClass:[Cell2 class]])
            {
                cell2 = (Cell2 *)obj;
                break;
            }
        }

        // Method 1
        cell2 = [[Cell2 alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier2];
         // Method 2
        //cell2 = [[Cell2 alloc] init];
        // Method 3
        //cell2 = (Cell2 *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier2];

        [cell2.contentView setAlpha:0];
        // prevent selection and other stuff
        [cell2 setUserInteractionEnabled:NO];
    }
    return cell2;
}
else
{
    // Configure the actual cell
}


return cell;

}

推荐答案

* 为了更好地理解，我重命名了您的一些 NIB/类名称.*

首先，您应该注册每个单元格的 NIB:

First, you should register each cells' NIB:

- (void)viewDidLoad{
    [super viewDidLoad];

    static NSString *CellIdentifier1 = @"ContentCell";
    static NSString *CellIdentifier2 = @"SpaceCell";

    UINib *nib = [UINib nibWithNibName:@"CellViewNIBName" bundle:nil];
    [self.tableView registerNib:nib forCellReuseIdentifier:CellIdentifier1];

    nib = [UINib nibWithNibName:@"CellSpaceNIBName" bundle:nil];
    [self.tableView registerNib:nib forCellReuseIdentifier:CellIdentifier2];

    self.contentView.hidden = YES;
    [self loadData];
}

因为您已注册 NIB，所以 dequeueReusableCellWithIdentifier: 将始终返回一个单元格:

Because you have the NIBs registered, dequeueReusableCellWithIdentifier: will always return a cell:

- (UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath      *)indexPath
{
    static NSString *CellIdentifier1 = @"ContentCell";
    static NSString *CellIdentifier2 = @"SpaceCell";

    // Space Cell
    if (indexPath.row % 2 == 1) {
        CellSpace *cell = (CellSpace *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier2];
        return cell;
    }

    // Content cell
    else {
        CellView *cell = (CellView *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier1];
        // Configure cell
        return cell;
    }
}

最后但并非最不重要的一点，请确保实现以下委托方法:

Last, but not least, make sure to implement the following delegate method:

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Space cell's height
    if (indexPath.row % 2 == 1) {
        return 20.0f;
    }

    // Content cell's height
    else {
        return 80.0f;
    }
}

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