自定义UITableViewCell，UITableView和allowsMultipleSelectionDuringEditing [英] Custom UITableViewCell, UITableView and allowsMultipleSelectionDuringEditing

问题描述

使用 iOS 5 新功能在编辑模式下选择多个单元格时出现问题。
申请结构如下：

I have a problem using iOS 5 new functionality to select multiple cells during editing mode. The application structure is the following:

-> UIViewController
---> UITableView
----> CustomUITableViewCell

其中 UIViewController 是委托和 UITableView 的数据源（我使用的是 UIViewController 而不是 UITableViewController 因需求原因而无法更改）。单元格加载到 UITableView 中，如下面的代码。

where UIViewController is both the delegate and the data source for the UITableView (I'm using an UIViewController instead of UITableViewController for requirement reasons and I cannot change it). Cells are loaded into the UITableView like the following code.

- (UITableViewCell *)tableView:(UITableView *)tv cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    CustomTableViewCell *cell = (CustomTableViewCell*)[tv dequeueReusableCellWithIdentifier:kCellTableIdentifier];
    if (cell == nil)
    {
        [[NSBundle mainBundle] loadNibNamed:@"CustomTableViewCellXib" owner:self options:nil];     
        cell = self.customTableViewCellOutlet;    
        cell.selectionStyle = UITableViewCellSelectionStyleNone;
    }

    // configure the cell with data
    [self configureCell:cell atIndexPath:indexPath];    

    return cell;
}

已从xib文件创建单元格界面。特别是，我创建了一个新的xib文件，其中superview包含一个 UITableViewCell 元素。为了提供自定义，我将该元素的类型设置为 CustomUITableViewCell ，其中 CustomUITableViewCell extends UITableViewCell 。

The cell interface has been created from a xib file. In particular, I've created a new xib file where the superview consists of a UITableViewCell element. To provide customization, I set the type for that element as CustomUITableViewCell, where CustomUITableViewCell extends UITableViewCell.

@interface CustomTableViewCell : UITableViewCell

// do stuff here

@end

代码效果很好。在表格中显示自定义单元格。现在，在应用程序执行期间，我将 allowsMultipleSelectionDuringEditing 设置为 YES ，然后进入的编辑模式的UITableView 。看起来很有效。实际上，每个单元格旁边都会出现一个空圆圈。问题是，当我选择一行时，空圆圈不会改变其状态。理论上，圆圈必须从空变为红色复选标记，反之亦然。似乎圆圈仍然在单元格的 contentView 之上。

The code works well. In the table custom cells are displayed. Now, during application execution I set allowsMultipleSelectionDuringEditing to YES and I enter the edit mode for the UITableView. It seems working. In fact, alongside of each cell an empty circle appears. The problem is that when I select a row the empty circle doesn't change its state. In theory, the circle has to change from empty to red checkmark and viceversa. It seems that circle remains above the contentView for the cell.

我做了很多实验。我还检查了以下方法。

I've made a lot of experiments. I've also checked also that following method.

- (NSArray *)indexPathsForSelectedRows

并在编辑模式选择期间更新。它会显示正确的选定单元格。

and it gets updated during selection in editing mode. It displays the right selected cells.

我不太清楚的是，当我尝试在没有自定义单元格的情况下工作时，仅使用 UITableViewCell ，圆圈正确更新其状态。

The thing that it's not so clear to me is that when I try to work without a custom cell, only with UITableViewCell, the circle updates its state correctly.

您有任何建议吗？提前谢谢。

Do you have any suggestion? Thank you in advance.

推荐答案

对于那些感兴趣的人，我找到了解决上一个问题的有效解决方案。
问题是当选择样式为 UITableViewCellSelectionStyleNone 编辑模式下的红色复选标记无法正确显示。解决方案是创建一个自定义 UITableViewCell 并ovverride一些方法。我正在使用 awakeFromNib ，因为我的单元格是通过xib创建的。为了达到解决方案，我遵循了以下两个stackoverflow主题：

For those interested in, I've found a valid solution to fix the previous problem. The problem is that when selection style is UITableViewCellSelectionStyleNone red checkmarks in editing mode aren't displayed correctly. The solution is to create a custom UITableViewCell and ovverride some methods. I'm using awakeFromNib because my cell has been created through xib. To reach the solution I've followed these two stackoverflow topics:

1. multi-select-table-view-cell-and-no-selection-style


2. uitableviewcell-how-to-prevent-blue -selection-background-wo-borking-isselected

1. multi-select-table-view-cell-and-no-selection-style
2. uitableviewcell-how-to-prevent-blue-selection-background-w-o-borking-isselected

此处代码：

- (void)awakeFromNib
{
    [super awakeFromNib];

    self.backgroundView = [[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"row_normal"]] autorelease];
    self.selectedBackgroundView = [[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"row_selected"]] autorelease];
}

- (void)setSelected:(BOOL)selected animated:(BOOL)animated
{
    if(selected && !self.isEditing)
    {

        return;
    }        

    [super setSelected:selected animated:animated];
}

- (void)setHighlighted: (BOOL)highlighted animated: (BOOL)animated
{
    // don't highlight
}

- (void)setEditing:(BOOL)editing animated:(BOOL)animated
{
    [super setEditing:editing animated:animated];

}

希望有所帮助。

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