iphone - uitableviewcell 上的附件勾选在某些情况下不显示

Question

我有两个表格 View ，一个有多个表格 View 单元格，每个单元格打开相同的 subview ，但用新数据初始化。

表中有大约 100 - 200 个条目，我有一个附属 View ，它是一个勾选，当选择一个单元格时，它会勾选该单元格，然后再次加载主视图。

如果我选择相同的单元格来获取相同的数据集，它将在屏幕中间加载先前选择的单元格(因此它知道其索引路径)，但是勾选“取决于列表的深度”将或将不可见..

它往往在表的前 30/40% 左右起作用，但任何低于刻度线的东西都不会可见......也就是说，除非我每次都来回越来越深入，然后有时我可以得到勾选以出现在桌面 View 的较深处。有人知道为什么会发生这种情况吗？

以前有人遇到过这种性质的事情吗？

经过进一步调查，我认为这个方法内部出了问题..

首先，在 subview 中，一旦用户选择一个单元格，就会调用此方法

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{

 // Navigation logic may go here. Create and push another view controller.
    [self.navigationController popViewControllerAnimated:YES]; //pops current view from the navigatoin stack

    //accesses selected cells content
    UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
    // now you can use cell.textLabel.text

    //This if statment is based off which cell was selected in the parent view so that it knows which cell to pass the data back to
    if (parentViewSelectedIndexPath.section == 0) {
        if (parentViewSelectedIndexPath.row == 0) {
            manufactureCellTextLabel = cell.textLabel.text; //passing label text over to NSString for use with delegate (check "viewwilldissapear")
            [[self delegate] setManufactureSearchFields:manufactureCellTextLabel withIndexPath:indexPath]; //This is where I pass the value back to the mainview
        }
// a few more If statements for the other methods I can pass data too.


//--- this if block allows only one cell selection at a time
    if (oldCheckedData == nil) { // No selection made yet
        oldCheckedData = indexPath;
        [cell setAccessoryType:UITableViewCellAccessoryCheckmark];

    }
    else {
        UITableViewCell *formerSelectedcell = [tableView cellForRowAtIndexPath:oldCheckedData]; // finding the already selected cell
        [formerSelectedcell setAccessoryType:UITableViewCellAccessoryNone];

        [cell setAccessoryType:UITableViewCellAccessoryCheckmark]; // 'select' the new cell
        oldCheckedData = indexPath;
    }   
}

这会将索引路径传递给主视图方法...

   - (void) setManufactureSearchFields:(NSString *)cellLabeltext withIndexPath:(NSIndexPath *)myIndexPath
    {
        manufactureSearchObjectString = cellLabeltext;
        manufactureResultIndexPath = myIndexPath;
        [self.tableView reloadData]; //reloads the tabels so you can see the value.
    }

//然后设置在下一个方法中使用的ManufacturerResultIndexPath，将其传回 subview

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Navigation logic may go here. Create and push another view controller.
    //--- Idendify selected indexPath (section/row)
    if (indexPath.section == 0) {
        //--- Get the subview ready for use
        VehicleResultViewController *vehicleResultViewController = [[VehicleResultViewController alloc] initWithNibName:@"VehicleResultViewController" bundle:nil];
        // ...
        //--- Sets the back button for the new view that loads
        self.navigationItem.backBarButtonItem = [[[UIBarButtonItem alloc] initWithTitle:@"Back" style: UIBarButtonItemStyleBordered target:nil action:nil] autorelease];

        // Pass the selected object to the new view controller.
        [self.navigationController pushViewController:vehicleResultViewController animated:YES];

        [vehicleResultViewController setDelegate:self];

        if (indexPath.row == 0) 
        {
            vehicleResultViewController.title = @"Manufacture";
            [vehicleResultViewController setRequestString:@"ID.xml"]; //sets the request string in searchResultsViewController
            vehicleResultViewController.dataSetToParse = @"ID"; // This is used to controll what data is shown on subview... logic
            [vehicleResultViewController setAccessoryIndexPath:manufactureResultIndexPath]; //sends indexpath back to subview for accessory tick
            vehicleResultViewController.parentViewSelectedIndexPath = indexPath;
        }


//etc etc
}

最后我将它传递给 subview 中的方法，该方法将索引路径传递给 oldCheckedData

- (void)setAccessoryIndexPath:(NSIndexPath *)myLastIndexPath
{
                oldCheckedData = myLastIndexPath;
                [self.tableView reloadData]; //<<---- this is where I reload the table to show the tick...
}

Answer 1

尝试将 cell.accessoryType = 行移动到 willDisplayCell: 委托(delegate)函数，如下所示:

- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath {

    // You can move this one here too:
    cell.selectionStyle = UITableViewCellSelectionStyleNone; // no blue selection

    if (indexPath == oldCheckedData) {
        cell.accessoryType = UITableViewCellAccessoryCheckmark;
    } else {
        cell.accessoryType = UITableViewCellAccessoryNone;
    } 
}

我读到 willDisplayCell: 方法应该用于对单元格进行任何基本的视觉相关修改，例如 selectionStyle/accessoryType，并且cellForRowAtIndexPath:用于单元格数据相关操作的方法，例如设置文本、图像等...