Ios 未调用TableView动态行高度_Ios_Objective C_Uitableview

Ios 未调用TableView动态行高度

ios objective-c uitableview

Ios 未调用TableView动态行高度,ios,objective-c,uitableview,Ios,Objective C,Uitableview,我有一个应用程序，它显示一个TableView，顶部有两个相对静态的单元格，后面是一系列包含标签和分段控件的自定义单元格。这些单元格的高度需要根据标签中的文本量而变化我正在计算cellForRowAtIndexPath中所需的单元格高度，将值存储在数组中，然后在heightForRowAtIndexPath中使用该数组中的值。然而，heightForRowAtIndexPath似乎是首先被调用的，因此我的所有行高度都是0/nil 在配置单元格之前需要知道单元格高度时，如何根据单元格的特定内容指

我有一个应用程序，它显示一个TableView，顶部有两个相对静态的单元格，后面是一系列包含标签和分段控件的自定义单元格。这些单元格的高度需要根据标签中的文本量而变化

我正在计算cellForRowAtIndexPath中所需的单元格高度，将值存储在数组中，然后在heightForRowAtIndexPath中使用该数组中的值。然而，heightForRowAtIndexPath似乎是首先被调用的，因此我的所有行高度都是0/nil

在配置单元格之前需要知道单元格高度时，如何根据单元格的特定内容指定行高度

cellForRowAtIndexPath中的代码段：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSInteger currentIndex = indexPath.item;
    if (indexPath.item == 0){
        static NSString *CellIdentifier = @"MeasurementCell";
        UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
        [self.cellHeightList insertObject:[NSNumber numberWithInt:44] atIndex:currentIndex];
        return cell;
    } else if (indexPath.item == 1){
        if (self.dataController.isScoreAvailable){
            static NSString *CellIdentifier = @"ScoreCell";
            UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
            [self.cellHeightList insertObject:[NSNumber numberWithInt:46] atIndex:currentIndex];
            return cell;
        } else {
            static NSString *CellIdentifier = @"ScoreCell";
            UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
            cell.accessoryType = UITableViewCellAccessoryNone;
            [self.cellHeightList insertObject:[NSNumber numberWithInt:0] atIndex:currentIndex];
            return cell;
        }
    } else if (indexPath.item > 1){
        NSInteger labelWidth = [UIScreen mainScreen].applicationFrame.size.width - 140; //80 for segment + 3*20 for margins & spacing
        CGSize maxSize = CGSizeMake(labelWidth, MAXFLOAT);
        CGSize labelSize;

        static NSString *CellIdentifier = @"QuestionCell";
        InterviewQuestionCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
        InterviewQuestion *questionAtIndex = [self.dataController objectInListAtIndex:(indexPath.item-2)];
        cell.questionLabel.text = questionAtIndex.questionText;
        labelSize = [cell.questionLabel.text sizeWithFont:[UIFont systemFontOfSize:12.0] constrainedToSize:maxSize lineBreakMode:NSLineBreakByWordWrapping];
        CGRect labelFrame = CGRectMake(0, 0, labelWidth, labelSize.height);
        cell.questionLabel.frame = labelFrame;
        cell.questionLabel.numberOfLines = 0;
        cell.answerControl.selectedSegmentIndex = questionAtIndex.answer;
        cell.answerControl.tag = indexPath.item;
        [self.cellHeightList insertObject:[NSNumber numberWithInt:labelSize.height] atIndex:currentIndex];
        return cell;
    }
    return nil;
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSInteger currentIndex = indexPath.item;
    return [[self.cellHeightList objectAtIndex:currentIndex] integerValue];
}

   - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
    {
        NSInteger currentIndex = indexPath.row;
        if (currentIndex == 0){
            static NSString *CellIdentifier = @"MeasurementCell";
            UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
            [[cell textLabel] setText:@"Eating"];
            [self.cellHeightList insertObject:[NSNumber numberWithInt:44] atIndex:currentIndex];
            return cell;
        } else if (currentIndex == 1){
            if (self.dataController.isScoreAvailable){
                static NSString *CellIdentifier = @"ScoreCell";
                UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
                [[cell textLabel] setText:@"Score"];
                [[cell detailTextLabel] setText:@"Score short description"];
                [self.cellHeightList insertObject:[NSNumber numberWithInt:46] atIndex:currentIndex];
                return cell;
            } else {
                static NSString *CellIdentifier = @"ScoreCell";
                UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
                [[cell textLabel] setText:@""];
                [[cell detailTextLabel] setText:@""];
                cell.accessoryType = UITableViewCellAccessoryNone;
                [self.cellHeightList insertObject:[NSNumber numberWithInt:0] atIndex:currentIndex];
                return cell;
            }
        } else if (currentIndex > 1){
            NSInteger labelWidth = [UIScreen mainScreen].applicationFrame.size.width - 140;
            CGSize maxSize = CGSizeMake(labelWidth, MAXFLOAT);

            static NSString *CellIdentifier = @"QuestionCell";
            InterviewQuestionCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
            InterviewQuestion *questionAtIndex = [self.dataController objectInListAtIndex:(currentIndex-2)];
            cell.questionLabel.text = questionAtIndex.questionText;
            CGSize labelSize = [cell.questionLabel.text sizeWithFont:[UIFont systemFontOfSize:12.0] constrainedToSize:maxSize lineBreakMode:NSLineBreakByWordWrapping];
            CGRect labelFrame = CGRectMake(0, 0, labelWidth, labelSize.height);
            cell.questionLabel.frame = labelFrame;
            cell.questionLabel.numberOfLines = 0;
            cell.answerControl.selectedSegmentIndex = questionAtIndex.answer;
            cell.answerControl.tag = indexPath.item;
            [self.cellHeightList insertObject:[NSNumber numberWithInt:labelSize.height] atIndex:currentIndex];
            return cell;
        }
        return nil;
    }

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSInteger currentIndex = indexPath.row;
    if (currentIndex == 0){
        return 44;
    } else if (currentIndex == 1){
        if (self.dataController.isScoreAvailable){
            return 46;
        } else {
            return 0;
        }
    } else if (currentIndex > 1){
        return [self getRowHeightForRow:currentIndex];
    }
    return 0;
}

heightForRowAtIndexPath中的代码：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSInteger currentIndex = indexPath.item;
    if (indexPath.item == 0){
        static NSString *CellIdentifier = @"MeasurementCell";
        UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
        [self.cellHeightList insertObject:[NSNumber numberWithInt:44] atIndex:currentIndex];
        return cell;
    } else if (indexPath.item == 1){
        if (self.dataController.isScoreAvailable){
            static NSString *CellIdentifier = @"ScoreCell";
            UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
            [self.cellHeightList insertObject:[NSNumber numberWithInt:46] atIndex:currentIndex];
            return cell;
        } else {
            static NSString *CellIdentifier = @"ScoreCell";
            UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
            cell.accessoryType = UITableViewCellAccessoryNone;
            [self.cellHeightList insertObject:[NSNumber numberWithInt:0] atIndex:currentIndex];
            return cell;
        }
    } else if (indexPath.item > 1){
        NSInteger labelWidth = [UIScreen mainScreen].applicationFrame.size.width - 140; //80 for segment + 3*20 for margins & spacing
        CGSize maxSize = CGSizeMake(labelWidth, MAXFLOAT);
        CGSize labelSize;

        static NSString *CellIdentifier = @"QuestionCell";
        InterviewQuestionCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
        InterviewQuestion *questionAtIndex = [self.dataController objectInListAtIndex:(indexPath.item-2)];
        cell.questionLabel.text = questionAtIndex.questionText;
        labelSize = [cell.questionLabel.text sizeWithFont:[UIFont systemFontOfSize:12.0] constrainedToSize:maxSize lineBreakMode:NSLineBreakByWordWrapping];
        CGRect labelFrame = CGRectMake(0, 0, labelWidth, labelSize.height);
        cell.questionLabel.frame = labelFrame;
        cell.questionLabel.numberOfLines = 0;
        cell.answerControl.selectedSegmentIndex = questionAtIndex.answer;
        cell.answerControl.tag = indexPath.item;
        [self.cellHeightList insertObject:[NSNumber numberWithInt:labelSize.height] atIndex:currentIndex];
        return cell;
    }
    return nil;
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSInteger currentIndex = indexPath.item;
    return [[self.cellHeightList objectAtIndex:currentIndex] integerValue];
}

   - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
    {
        NSInteger currentIndex = indexPath.row;
        if (currentIndex == 0){
            static NSString *CellIdentifier = @"MeasurementCell";
            UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
            [[cell textLabel] setText:@"Eating"];
            [self.cellHeightList insertObject:[NSNumber numberWithInt:44] atIndex:currentIndex];
            return cell;
        } else if (currentIndex == 1){
            if (self.dataController.isScoreAvailable){
                static NSString *CellIdentifier = @"ScoreCell";
                UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
                [[cell textLabel] setText:@"Score"];
                [[cell detailTextLabel] setText:@"Score short description"];
                [self.cellHeightList insertObject:[NSNumber numberWithInt:46] atIndex:currentIndex];
                return cell;
            } else {
                static NSString *CellIdentifier = @"ScoreCell";
                UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
                [[cell textLabel] setText:@""];
                [[cell detailTextLabel] setText:@""];
                cell.accessoryType = UITableViewCellAccessoryNone;
                [self.cellHeightList insertObject:[NSNumber numberWithInt:0] atIndex:currentIndex];
                return cell;
            }
        } else if (currentIndex > 1){
            NSInteger labelWidth = [UIScreen mainScreen].applicationFrame.size.width - 140;
            CGSize maxSize = CGSizeMake(labelWidth, MAXFLOAT);

            static NSString *CellIdentifier = @"QuestionCell";
            InterviewQuestionCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
            InterviewQuestion *questionAtIndex = [self.dataController objectInListAtIndex:(currentIndex-2)];
            cell.questionLabel.text = questionAtIndex.questionText;
            CGSize labelSize = [cell.questionLabel.text sizeWithFont:[UIFont systemFontOfSize:12.0] constrainedToSize:maxSize lineBreakMode:NSLineBreakByWordWrapping];
            CGRect labelFrame = CGRectMake(0, 0, labelWidth, labelSize.height);
            cell.questionLabel.frame = labelFrame;
            cell.questionLabel.numberOfLines = 0;
            cell.answerControl.selectedSegmentIndex = questionAtIndex.answer;
            cell.answerControl.tag = indexPath.item;
            [self.cellHeightList insertObject:[NSNumber numberWithInt:labelSize.height] atIndex:currentIndex];
            return cell;
        }
        return nil;
    }

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSInteger currentIndex = indexPath.row;
    if (currentIndex == 0){
        return 44;
    } else if (currentIndex == 1){
        if (self.dataController.isScoreAvailable){
            return 46;
        } else {
            return 0;
        }
    } else if (currentIndex > 1){
        return [self getRowHeightForRow:currentIndex];
    }
    return 0;
}

谢谢大家!

首先确保在indexPath上不使用'item'，而是使用'row'。我认为UICollectionView使用的是项，而不是UITableView。第二，您需要某种方法来计算单元格的大小，而不需要将单元格放在手边。您的tableView具有一定的宽度，因此基于此，您可以计算必要的高度。将此计算放在HeightForRowatineXpath中：（如果这是密集型的，请缓存它）

具体而言，将以下代码不放置在CellForRowatineXpath中，而是放置在HeightForRowatineXpath中：

NSInteger labelWidth = [UIScreen mainScreen].applicationFrame.size.width - 140;
CGSize maxSize = CGSizeMake(labelWidth, MAXFLOAT);
CGSize labelSize;

另外，不使用UI屏幕，只需使用tableView的宽度，它会降低代码之间的紧密耦合。

我使用Joride的答案作为一个很好的起点，然后将标签高度功能拉到一个单独的函数中。我想我会再提取一个缺口，然后从该函数返回标签的实际CGSize，这样我就可以从HeightForRowatineXpath和CellForRowatineXpath中清晰地调用它。我在下面包含了我的更新代码

cellForRowAtIndexPath:

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSInteger currentIndex = indexPath.item;
    if (indexPath.item == 0){
        static NSString *CellIdentifier = @"MeasurementCell";
        UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
        [self.cellHeightList insertObject:[NSNumber numberWithInt:44] atIndex:currentIndex];
        return cell;
    } else if (indexPath.item == 1){
        if (self.dataController.isScoreAvailable){
            static NSString *CellIdentifier = @"ScoreCell";
            UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
            [self.cellHeightList insertObject:[NSNumber numberWithInt:46] atIndex:currentIndex];
            return cell;
        } else {
            static NSString *CellIdentifier = @"ScoreCell";
            UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
            cell.accessoryType = UITableViewCellAccessoryNone;
            [self.cellHeightList insertObject:[NSNumber numberWithInt:0] atIndex:currentIndex];
            return cell;
        }
    } else if (indexPath.item > 1){
        NSInteger labelWidth = [UIScreen mainScreen].applicationFrame.size.width - 140; //80 for segment + 3*20 for margins & spacing
        CGSize maxSize = CGSizeMake(labelWidth, MAXFLOAT);
        CGSize labelSize;

        static NSString *CellIdentifier = @"QuestionCell";
        InterviewQuestionCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
        InterviewQuestion *questionAtIndex = [self.dataController objectInListAtIndex:(indexPath.item-2)];
        cell.questionLabel.text = questionAtIndex.questionText;
        labelSize = [cell.questionLabel.text sizeWithFont:[UIFont systemFontOfSize:12.0] constrainedToSize:maxSize lineBreakMode:NSLineBreakByWordWrapping];
        CGRect labelFrame = CGRectMake(0, 0, labelWidth, labelSize.height);
        cell.questionLabel.frame = labelFrame;
        cell.questionLabel.numberOfLines = 0;
        cell.answerControl.selectedSegmentIndex = questionAtIndex.answer;
        cell.answerControl.tag = indexPath.item;
        [self.cellHeightList insertObject:[NSNumber numberWithInt:labelSize.height] atIndex:currentIndex];
        return cell;
    }
    return nil;
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSInteger currentIndex = indexPath.item;
    return [[self.cellHeightList objectAtIndex:currentIndex] integerValue];
}

   - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
    {
        NSInteger currentIndex = indexPath.row;
        if (currentIndex == 0){
            static NSString *CellIdentifier = @"MeasurementCell";
            UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
            [[cell textLabel] setText:@"Eating"];
            [self.cellHeightList insertObject:[NSNumber numberWithInt:44] atIndex:currentIndex];
            return cell;
        } else if (currentIndex == 1){
            if (self.dataController.isScoreAvailable){
                static NSString *CellIdentifier = @"ScoreCell";
                UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
                [[cell textLabel] setText:@"Score"];
                [[cell detailTextLabel] setText:@"Score short description"];
                [self.cellHeightList insertObject:[NSNumber numberWithInt:46] atIndex:currentIndex];
                return cell;
            } else {
                static NSString *CellIdentifier = @"ScoreCell";
                UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
                [[cell textLabel] setText:@""];
                [[cell detailTextLabel] setText:@""];
                cell.accessoryType = UITableViewCellAccessoryNone;
                [self.cellHeightList insertObject:[NSNumber numberWithInt:0] atIndex:currentIndex];
                return cell;
            }
        } else if (currentIndex > 1){
            NSInteger labelWidth = [UIScreen mainScreen].applicationFrame.size.width - 140;
            CGSize maxSize = CGSizeMake(labelWidth, MAXFLOAT);

            static NSString *CellIdentifier = @"QuestionCell";
            InterviewQuestionCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
            InterviewQuestion *questionAtIndex = [self.dataController objectInListAtIndex:(currentIndex-2)];
            cell.questionLabel.text = questionAtIndex.questionText;
            CGSize labelSize = [cell.questionLabel.text sizeWithFont:[UIFont systemFontOfSize:12.0] constrainedToSize:maxSize lineBreakMode:NSLineBreakByWordWrapping];
            CGRect labelFrame = CGRectMake(0, 0, labelWidth, labelSize.height);
            cell.questionLabel.frame = labelFrame;
            cell.questionLabel.numberOfLines = 0;
            cell.answerControl.selectedSegmentIndex = questionAtIndex.answer;
            cell.answerControl.tag = indexPath.item;
            [self.cellHeightList insertObject:[NSNumber numberWithInt:labelSize.height] atIndex:currentIndex];
            return cell;
        }
        return nil;
    }

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSInteger currentIndex = indexPath.row;
    if (currentIndex == 0){
        return 44;
    } else if (currentIndex == 1){
        if (self.dataController.isScoreAvailable){
            return 46;
        } else {
            return 0;
        }
    } else if (currentIndex > 1){
        return [self getRowHeightForRow:currentIndex];
    }
    return 0;
}

ROWATINDEXPATH的高度：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSInteger currentIndex = indexPath.item;
    if (indexPath.item == 0){
        static NSString *CellIdentifier = @"MeasurementCell";
        UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
        [self.cellHeightList insertObject:[NSNumber numberWithInt:44] atIndex:currentIndex];
        return cell;
    } else if (indexPath.item == 1){
        if (self.dataController.isScoreAvailable){
            static NSString *CellIdentifier = @"ScoreCell";
            UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
            [self.cellHeightList insertObject:[NSNumber numberWithInt:46] atIndex:currentIndex];
            return cell;
        } else {
            static NSString *CellIdentifier = @"ScoreCell";
            UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
            cell.accessoryType = UITableViewCellAccessoryNone;
            [self.cellHeightList insertObject:[NSNumber numberWithInt:0] atIndex:currentIndex];
            return cell;
        }
    } else if (indexPath.item > 1){
        NSInteger labelWidth = [UIScreen mainScreen].applicationFrame.size.width - 140; //80 for segment + 3*20 for margins & spacing
        CGSize maxSize = CGSizeMake(labelWidth, MAXFLOAT);
        CGSize labelSize;

        static NSString *CellIdentifier = @"QuestionCell";
        InterviewQuestionCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
        InterviewQuestion *questionAtIndex = [self.dataController objectInListAtIndex:(indexPath.item-2)];
        cell.questionLabel.text = questionAtIndex.questionText;
        labelSize = [cell.questionLabel.text sizeWithFont:[UIFont systemFontOfSize:12.0] constrainedToSize:maxSize lineBreakMode:NSLineBreakByWordWrapping];
        CGRect labelFrame = CGRectMake(0, 0, labelWidth, labelSize.height);
        cell.questionLabel.frame = labelFrame;
        cell.questionLabel.numberOfLines = 0;
        cell.answerControl.selectedSegmentIndex = questionAtIndex.answer;
        cell.answerControl.tag = indexPath.item;
        [self.cellHeightList insertObject:[NSNumber numberWithInt:labelSize.height] atIndex:currentIndex];
        return cell;
    }
    return nil;
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSInteger currentIndex = indexPath.item;
    return [[self.cellHeightList objectAtIndex:currentIndex] integerValue];
}

   - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
    {
        NSInteger currentIndex = indexPath.row;
        if (currentIndex == 0){
            static NSString *CellIdentifier = @"MeasurementCell";
            UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
            [[cell textLabel] setText:@"Eating"];
            [self.cellHeightList insertObject:[NSNumber numberWithInt:44] atIndex:currentIndex];
            return cell;
        } else if (currentIndex == 1){
            if (self.dataController.isScoreAvailable){
                static NSString *CellIdentifier = @"ScoreCell";
                UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
                [[cell textLabel] setText:@"Score"];
                [[cell detailTextLabel] setText:@"Score short description"];
                [self.cellHeightList insertObject:[NSNumber numberWithInt:46] atIndex:currentIndex];
                return cell;
            } else {
                static NSString *CellIdentifier = @"ScoreCell";
                UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
                [[cell textLabel] setText:@""];
                [[cell detailTextLabel] setText:@""];
                cell.accessoryType = UITableViewCellAccessoryNone;
                [self.cellHeightList insertObject:[NSNumber numberWithInt:0] atIndex:currentIndex];
                return cell;
            }
        } else if (currentIndex > 1){
            NSInteger labelWidth = [UIScreen mainScreen].applicationFrame.size.width - 140;
            CGSize maxSize = CGSizeMake(labelWidth, MAXFLOAT);

            static NSString *CellIdentifier = @"QuestionCell";
            InterviewQuestionCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
            InterviewQuestion *questionAtIndex = [self.dataController objectInListAtIndex:(currentIndex-2)];
            cell.questionLabel.text = questionAtIndex.questionText;
            CGSize labelSize = [cell.questionLabel.text sizeWithFont:[UIFont systemFontOfSize:12.0] constrainedToSize:maxSize lineBreakMode:NSLineBreakByWordWrapping];
            CGRect labelFrame = CGRectMake(0, 0, labelWidth, labelSize.height);
            cell.questionLabel.frame = labelFrame;
            cell.questionLabel.numberOfLines = 0;
            cell.answerControl.selectedSegmentIndex = questionAtIndex.answer;
            cell.answerControl.tag = indexPath.item;
            [self.cellHeightList insertObject:[NSNumber numberWithInt:labelSize.height] atIndex:currentIndex];
            return cell;
        }
        return nil;
    }

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSInteger currentIndex = indexPath.row;
    if (currentIndex == 0){
        return 44;
    } else if (currentIndex == 1){
        if (self.dataController.isScoreAvailable){
            return 46;
        } else {
            return 0;
        }
    } else if (currentIndex > 1){
        return [self getRowHeightForRow:currentIndex];
    }
    return 0;
}

新的getRowHeightForRow函数：

- (NSInteger)getRowHeightForRow:(NSInteger)currentRow{
    NSInteger labelWidth = [UIScreen mainScreen].applicationFrame.size.width - 140; //80 for segment + 3*20 for margins & spacing
    CGSize maxSize = CGSizeMake(labelWidth, MAXFLOAT);
    InterviewQuestion *questionAtIndex = [self.dataController objectInListAtIndex:(currentRow-2)];
    NSString *questionText = questionAtIndex.questionText;
    CGSize labelSize = [questionText sizeWithFont:[UIFont systemFontOfSize:12.0] constrainedToSize:maxSize lineBreakMode:NSLineBreakByWordWrapping];
    return labelSize.height;

}

谢谢你关于“行”而不是“项”的提示。我想那有点干净。至于在heightForRowAtIndexPath中添加调整大小的代码，我需要从我的面试问题中提取文本才能做到这一点。在这两个位置调用InterviewQuestion对象以获取文本是否更干净，还是我应该拉一次并将其存储在此ViewController的属性中？建议的方法是将这些文本项存储在属性（NSArray）上。这样，您可以从两个位置访问项目，而无需额外工作。此外，当该数组中的项目发生更改时，您只需调用-reloadCellAtIndexPath:即可重新加载该单元格。（或者你可以使用丑陋的大锤子：-在开发过程中重新加载数据，看看你的逻辑是否正确。）看起来不错。为了使您的代码更具可读性，我建议您对NSNumbers使用现代Objective-C：而不是。“[NSNumber numberWithInt:46]”，您可以使用“@（46）”（不带引号）。编译器将从中创建一个NSNumber，您的代码基本相同，但可读性更好。实际上，不需要调用

heightforrowatinexpath

。只能在viewDidLoad（或ViewWillDisplay）中使用：

tableView.rowHeight=UITableViewAutomaticDimension