iOS UITableView 单元格重复

Question

我有一个 tableviewcontroller，它在单元格中创建了动态控件。如果是下拉类型，我会将用户带到不同的 tableviewcontroller 来选择值。选择后，我会弹出并重新加载数据，但是当我这样做时，它会一层一层地覆盖单元格。我知道这是因为我重复使用了细胞，但我似乎不知道如何防止它。

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:YES];

    [self.tableView reloadData];

}


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {


    EWHInboundCustomAttribute *ca = [visibleCustomAttributes objectAtIndex:indexPath.row];

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell"];
        cell.tag=indexPath.row;


    if (ca.CustomControlType == 1) {
        cell.detailTextLabel.hidden=true;
        cell.textLabel.hidden=true;

        UITextField *caTextField = [[UITextField alloc] initWithFrame:CGRectMake(10, 10, 185, 30)];

            caTextField.adjustsFontSizeToFitWidth = YES;
            caTextField.textColor = [UIColor blackColor];

            caTextField.placeholder = ca.LabelCaption;
            if (ca.ReadOnly) {
                [caTextField setEnabled: NO];
            } else {
                [caTextField setEnabled: YES];
            }
            caTextField.text=nil;
            caTextField.text=ca.Value;
            caTextField.tag=indexPath.row;

            caTextField.delegate=self;

            [cell.contentView addSubview:caTextField];



    } else if (ca.CustomControlType == 4) {

        cell.detailTextLabel.text=ca.Value;
        cell.textLabel.text=ca.LabelCaption;
        cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;

    } else {

            cell.detailTextLabel.hidden=true;
            cell.textLabel.hidden=true;
            UITextField *caTextField = [[UITextField alloc] initWithFrame:CGRectMake(10, 10, 185, 30)];
            caTextField.adjustsFontSizeToFitWidth = YES;
            caTextField.textColor = [UIColor grayColor];

            caTextField.placeholder = ca.LabelCaption;
            [caTextField setEnabled: NO];
            caTextField.text = ca.Value;

            caTextField.tag=indexPath.row;
            caTextField.delegate=self;
            [cell.contentView addSubview:caTextField];
    }



    return cell;
}

Answer 1

与其每次都创建 UITextfield，我建议至少使用 [UIView viewWithTag:tag] 来捕获相同的 UITextField 对象。