ios - UITableview重复复选标记

Question

我已经尝试了一切来让它工作，但是当我滚动时cellForRowAtIndexPath，它似乎在我的 tableview 上添加和删除复选标记，有人可以帮忙吗？

// Configure the cell...
cell.textLabel.text = [currencyList objectAtIndex:indexPath.row];

// Check to see what currency is currently selected and checkstyle
if ([selectedCurrency isEqualToString:cell.textLabel.text]) {

    // Add a tick to the selected row
    cell.accessoryType = UITableViewCellAccessoryCheckmark;

    // Change the text colour
    cell.textLabel.textColor = [UIColor colorWithRed:0 green:0 blue:0.5 alpha:1];
    self.checkedIndexPath = indexPath;
} else {
    UITableViewCell *uncheckCell = [self.tableView
                                    cellForRowAtIndexPath:self.checkedIndexPath];
    uncheckCell.accessoryType = UITableViewCellAccessoryNone;
    // Change the font colour back to black
    uncheckCell.textLabel.textColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:1];
}

Answer 1

您无需取消选中 cell in cellForRowAtIndexPath。更好的解决方案只是重新加载已检查的单元格。

- (void)setCheckedIndexPath:(NSIndexPath *)indexPath
{
    NSIndexPath *uncheckIndexPath = self.checkedIndexPath;
    _checkedIndexPath = indexPath;
    [self.tableView reloadRowsAtIndexPaths:@[uncheckIndexPath]
                          withRowAnimation:UITableViewRowAnimationLeft];
}

并改变cellForRowAtIndexPath。请注意，我们设置UITableViewCellAccessoryNone为必须返回的单元格，而不是您要取消选中的单元格。

// Configure the cell...
cell.textLabel.text = [currencyList objectAtIndex:indexPath.row];

// Check to see what currency is currently selected and checkstyle
if ([selectedCurrency isEqualToString:cell.textLabel.text]) {

    // Add a tick to the selected row
    cell.accessoryType = UITableViewCellAccessoryCheckmark;

    // Change the text colour
    cell.textLabel.textColor = [UIColor colorWithRed:0 green:0 blue:0.5 alpha:1];
    self.checkedIndexPath = indexPath;
} else {
    //If cell unchecked
    cell.accessoryType = UITableViewCellAccessoryNone;
    // Change the font colour back to black
    cell.textLabel.textColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:1];
}