如何在ios中根据textlength增加UItableView Cell和UITextView高度

Question

嗨，我是 Ios 的初学者，在我的项目中，我在 UItableview 单元格上添加了 UItextView，并根据 textlength 自动增加 UItextview 和 UItableview 单元格的高度，但根据我的代码，所有 textdata 都没有显示在 textview 上，有些数据丢失了请帮助我某一个

这是我的代码：

 formulaArray = [NSArray arrayWithObjects:@"Implement exponential back-off in your retry mechanism. (e.g. if you waited one second before the first retry,Implement exponential back-off in your retry mechanism. (e.g. if you waited one second before the first retry,Implement exponential back-off in your retry mechanism. (e.g. if you waited one second before the first retry,Implement exponential back-off in your retry mechanism. (e.g. if you waited one second before the first retry,finally",nil];


- (UITableViewCell *)tableView:(UITableView *)tableView
         cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *cellIdentifier = @"cellIdentifier";

    UITableViewCell *cell =
    [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
     cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];

if(indexPath.section == 1)
    {

        formulaText = [[UITextView alloc]init];
        formulaText.font = [UIFont fontWithName:@"Bitter-Regular" size:15.0f];
        formulaText.translatesAutoresizingMaskIntoConstraints = NO;
        formulaText.backgroundColor = [UIColor lightGrayColor];
        formulaText.scrollEnabled = NO;
        [cell.contentView addSubview:formulaText];

        NSDictionary * views = NSDictionaryOfVariableBindings(formulaText);

        NSArray * formulaH = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-10-[formulaText]-10-|"
                                                                        options:0
                                                                        metrics:nil
                                                                          views:views];

        NSArray * formulaV = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-5-[formulaText]-5-|"
                                                                     options:0
                                                                     metrics:nil
                                                                       views:views];

        [cell.contentView addConstraints:formulaH];
        [cell.contentView addConstraints:formulaV];

        formulaText.text = [formulaArray objectAtIndex:0];

        #define kMaxHeight 100.f
        formulaText.contentSize = [formulaText.text sizeWithFont:[UIFont fontWithName:@"Bitter-Regular" size:15.0]
                                                   constrainedToSize:CGSizeMake(100, kMaxHeight)
                                                       lineBreakMode:NSLineBreakByWordWrapping];

    }

    if (indexPath.section == 2)
    {
        aboutText = [[UITextView alloc]init];
        aboutText.font = [UIFont fontWithName:@"Bitter-Regular" size:15.0f];
        aboutText.translatesAutoresizingMaskIntoConstraints = NO;
        aboutText.backgroundColor = [UIColor darkGrayColor];
        aboutText.scrollEnabled = NO;
        [cell.contentView addSubview:aboutText];

        NSDictionary * views = NSDictionaryOfVariableBindings(aboutText);

        NSArray * formulaH = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-10-[aboutText]-10-|"
                                                                     options:0
                                                                     metrics:nil
                                                                       views:views];

        NSArray * formulaV = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-5-[aboutText]-5-|"
                                                                     options:0
                                                                     metrics:nil
                                                                       views:views];

        [cell.contentView addConstraints:formulaH];
        [cell.contentView addConstraints:formulaV];

        aboutText.text = [aboutArray objectAtIndex:0];
        #define kMaxHeight 100.f
        aboutText.contentSize = [aboutText.text sizeWithFont:[UIFont fontWithName:@"Bitter-Regular" size:15.0]
                                               constrainedToSize:CGSizeMake(100, kMaxHeight)
                                               lineBreakMode:NSLineBreakByWordWrapping];
    }

    return cell;
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    //return 200;

    if([indexPath section] == 0)
    {
        return  200;
    }

    else if([indexPath section] == 1)
    {
        NSString *cellText = [formulaArray objectAtIndex:0];
        UIFont *cellFont = [self fontForCell];
        CGSize constraintSize = CGSizeMake(280.0f, MAXFLOAT);
        CGSize labelSize = [cellText sizeWithFont:cellFont constrainedToSize:constraintSize lineBreakMode:NSLineBreakByWordWrapping];
        return labelSize.height + 20;
    }

    else
    {
        NSString *cellText = [aboutArray objectAtIndex:0];
        UIFont *cellFont = [self fontForCell];
        CGSize constraintSize = CGSizeMake(280.0f, MAXFLOAT);
        CGSize labelSize = [cellText sizeWithFont:cellFont constrainedToSize:constraintSize lineBreakMode:NSLineBreakByWordWrapping];
        return labelSize.height + 20;
    }
}

但是这里的公式数组所有 text 数据没有显示请帮帮我

Answer 1

试试这个。

  - (CGSize )getLabelSizeForString:(NSString *)message      withLabel:(UILabel *)label{
     CGSize size = [message sizeWithFont:label.font constrainedToSize:CGSizeMake(label.bounds.size.width, 99999) lineBreakMode:NSLineBreakByWordWrapping];
      return size;
   }
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{

CustomCell *cell = [tableView dequeueReusableCellWithIdentifier:@"CustomCell"];
NSString *message = [[self.dataArray objectAtIndex:indexPath.row]valueForKey:Message];
CGSize size = [[GlobalConstants sharedInstance] getLabelSizeForString:message withLabel:cell.aboutLabel];

    return size.height;
   }

或者你可以引用链接 http://www.fantageek.com/1468/ios-dynamic-table-view-cells-with-varying-row-height-and-autolayout/

Answer 2

我觉得这个功能

CGSize labelSize = [cellText sizeWithFont:cellFont constrainedToSize:constraintSize lineBreakMode:NSLineBreakByWordWrapping];

在您的身高 ForRowAtIndexPath 中已弃用。

尝试使用 NSFontAttribute 代替它。在您的情况下，它看起来像这样：

CGRect textRect = [cellText boundingRectWithSize:constraintSize
                                 options:NSStringDrawingUsesLineFragmentOrigin
                              attributes:@{NSFontAttributeName:cellFont}
                                 context:nil];
CGSize labelSize = textRect.size;

如果您想动态增加它，您需要刷新已编辑的特定单元格。在你的

- (void)textViewDidChange:(UITextView *)textView

您需要刷新您的单元格。

  [tableView reloadRowsAtIndexPaths:@[yourIndex] withRowAnimation:UITableViewRowAnimationNone];

Answer 3

    - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return formulaArray.count;
}

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

    MyTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"CellIdentifier"];


    cell.myTextView.text     = formulaArray[indexPath.row];

    [cell.contentView layoutIfNeeded];
    return cell;
}

    - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
    return UITableViewAutomaticDimension;
}

    - (CGFloat)tableView:(UITableView *)tableView estimatedHeightForRowAtIndexPath:(NSIndexPath *)indexPath {
    return UITableViewAutomaticDimension;
}

您可以通过情节提要轻松实现这些。

1. 在单元格中拖动 textview 并仅添加顶部、底部、前导和尾随约束。

2. 取消选中为 textview 启用滚动。

3. 然后实现这些方法