访问cellForRowAtIndexPath之外的单元属性

Question

我在Signup控制器上设置了五个字段.用户名,显示名,密码,确认密码和电子邮件地址.

它们设置如下:

static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = (UITableViewCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }

    cell.selectionStyle = UITableViewCellSelectionStyleNone;
    cell.textLabel.textColor = [UIColor colorWithRed:14.0f/255.0f green:62.0f/255.0f blue:178.0f/255.0f alpha:0.8f];
    cell.textLabel.font = [UIFont boldSystemFontOfSize:13.0f];


    switch ( indexPath.row ) {
        case 0: {
            cell.textLabel.text = NSLocalizedString(@"UsernameFieldLabel", @"Username field label");
            [cell addSubview:self.usernameField];
            break ;
        }
        case 1: {
            cell.textLabel.text = NSLocalizedString(@"DisplayNameFieldLabel", @"Displayname field lael");
            [cell addSubview:self.displayNameField];
            break ;
        }
        case 2: {
            cell.textLabel.text = NSLocalizedString(@"PasswordFieldLabel", @"Password field lael");
            [cell addSubview:self.passwordField];
            break ;
        }
        case 3: {
            cell.textLabel.text = NSLocalizedString(@"ConfirmPasswordFieldLabel", @"Confirm Password field lael");
            cell.textLabel.lineBreakMode = UILineBreakModeWordWrap;
            cell.textLabel.numberOfLines = 2;
            [cell addSubview:self.confirmPasswordField];
            break ;
        }
        case 4: {
            cell.textLabel.text = NSLocalizedString(@"EmailFieldLabel", @"Email field lael");
            [cell addSubview:self.emailField];
            break ;
        }
    }

    return cell;

细胞本身工作正常.然后我对一个检查有效电子邮件地址等的按钮进行了一些验证,这也可以正常工作.

我想要做的是更新验证代码中的cell.textLabel.textColor属性.例如,如果电子邮件地址无效,我想将标签文本颜色更新为红色,以便它突出(我也对响应者进行排序等).

如何在单元设置之外获取对此特定单元的引用？

编辑 这是答案后的变化.我需要访问第1节中的第5个cll(索引路径4)(表视图中只有一个部分):

NSIndexPath *indexPath = [NSIndexPath indexPathForRow:4 inSection:1];

UITableViewCell* cell = [self.tableView cellForRowAtIndexPath:indexPath];
cell.textLabel.textColor = [UIColor redColor];
[self.tableView reloadRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];

Answer 1

你可以使用NSIndexPath获得UITableViewCell.

NSIndexPath *indexPath = [NSIndexPath indexPathForRow:YOUR_ROW inSection:YOUR_SECTION];

UITableViewCell* cell = [yourTable cellForRowAtIndexPath:indexPath];
cell.textLabel.textColor = YOUR_COLOR;
[yourTable reloadRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];

希望它能帮到你.