当表格向上滚动并返回到该单元格时，UITableViewCell背景图像问题

当用户在表格上下滚动时，我面临UITableViewCell设置问题。一旦分组的表格滚动到另一个单元格并返回到该单元格，该单元格将取消更改（在

-didSelectRowAtIndexPath

中设置的红色/绿色背景图像）

我用下面的代码在两个部分展示了一个问题和4个答案选项

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    NSString *kCustomCellID = [NSString stringWithFormat:@"CustomCellID%d", ((100 * indexPath.section) + indexPath.row)];

    UITableViewCell *cell = nil;//[tableView dequeueReusableCellWithIdentifier:kCustomCellID];

    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:kCustomCellID] autorelease];
        cell.selectionStyle = UITableViewCellSelectionStyleNone;
    }

    if (indexPath.section == 0) {
        cell.textLabel.text = questionText;
        cell.textLabel.textAlignment = UITextAlignmentCenter;
        cell.textLabel.font = FONT_QUESTIONTEXT;
        cell.textLabel.numberOfLines = 0;
    }
    else {
        cell.textLabel.text = [self.answerChoices objectAtIndex:indexPath.row];
        cell.textLabel.font = FONT_ANSWERTEXT;
        cell.textLabel.numberOfLines = 0;

        ConfigurationBase *configBase = [[ConfigurationBase alloc] initWithConfigurationType:kConfigTypeQuiz];

        NSString *backgroundImageName = [configBase.configInfo valueForKey:CKEY_IMG_ANSWER_BACKGROUND];
        NSString *leftImage = [configBase.configInfo valueForKey:[choicesLeftImages objectAtIndex:indexPath.row]];
        [configBase release];

        cell.backgroundColor = [UIColor clearColor];
        UIImageView *bgView = [[UIImageView alloc] initWithFrame:cell.frame];
        bgView.image = [UIImage imageNamed:backgroundImageName];
        cell.backgroundView = bgView;
        [bgView release];

        cell.imageView.image = [UIImage imageNamed:leftImage];
    }

    return cell;
}

而且，当用户选择其中一个选项时，我会用绿色和红色更改背景颜色的正确选择和错误选择。下面是更改两行背景的代码

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    if (indexPath.section == 1) {   // Answer choice section.
        NSString *correctAnswerStr = [quizSession fetchCorrectAnswer];
        NSInteger correctAnswerIndex = -1;
        ConfigurationBase *configBase = [[ConfigurationBase alloc] initWithConfigurationType:kConfigTypeQuiz];

        NSString *correctAnsImageName = [configBase.configInfo valueForKey:CKEY_IMG_ANSWER_CORRECT_BACKGROUND];
        NSString *wrongAnsImageName = [configBase.configInfo valueForKey:CKEY_IMG_ANSWER_WRONG_BACKGROUND];
        [configBase release];

        UITableViewCell *answerCell = [tableView cellForRowAtIndexPath:indexPath];

        answerCell.backgroundColor = [UIColor clearColor];
        UIImageView *bgView = [[UIImageView alloc] initWithFrame:answerCell.frame];
        bgView.image = [UIImage imageNamed:wrongAnsImageName];
        answerCell.backgroundView = bgView;
        [bgView release];

        for (NSString *answerChoice in answerChoices) {
            ++correctAnswerIndex;

            if ([answerChoice isEqualToString:correctAnswerStr]) {
                // Correct Index obtained, so set the background color for it.
                NSIndexPath *correctIndexPath = [NSIndexPath indexPathForRow:correctAnswerIndex
                                                                   inSection:indexPath.section];
                UITableViewCell *correctAnswerCell = [tableView cellForRowAtIndexPath:correctIndexPath];

                correctAnswerCell.backgroundColor = [UIColor clearColor];
                UIImageView *bgView = [[UIImageView alloc] initWithFrame:correctAnswerCell.frame];
                bgView.image = [UIImage imageNamed:correctAnsImageName];
                correctAnswerCell.backgroundView = bgView;
                [bgView release];

                break;
            }
        }

        // Enable the 'next' button, allowing user to go for next question.
        self.navigationItem.rightBarButtonItem.enabled = YES;
        // Disable selection of answer until user go to next question.
    tableView.allowsSelection = NO;
}

有人能帮我吗？蒂亚

---

注意。

您检索背景图像名称信息的方法非常复杂且容易出错。请在适当的位置插入

NSLog

s或检查调试器，以确保一切正常工作

处理单元格的

backgroundView

属性时，必须将此代码放入

tableView:willDisplayCell:ForRowatineXpath:

而不是

CellForRowatineXpath

中。一个更简单的方法将再次为您节省时间