ios - 具有动态高度 iOS 的 UITableViewCell

Question

我在我的应用中使用 CustomCell 实现了 TableView，

UITableViewCell我想要我根据文本长度的动态高度UITableViewCell，

这是快照Customcell

：这是我的快照UITableView ：代码片段heightForRowAtIndexPath

#define FONT_SIZE 14.0f
#define CELL_CONTENT_WIDTH 320.0f
#define CELL_CONTENT_MARGIN 10.0f

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath;
{
    NSString *text = [DescArr objectAtIndex:[indexPath row]];
    CGSize constraint = CGSizeMake(CELL_CONTENT_WIDTH - (CELL_CONTENT_MARGIN * 2), 20000.0f);
    CGSize size = [text sizeWithFont:[UIFont systemFontOfSize:FONT_SIZE] constrainedToSize:constraint lineBreakMode:UILineBreakModeWordWrap];
    CGFloat height = MAX(size.height, 100.0);
    return height; 
}

正如您在第二张图片中看到的，单元格的高度是固定的，它不会随其文本（内容）大小而改变。

我在哪里犯错？如何制作标签或单元格以根据其内容/文本更新其大小？

Answer 1

请看这里-动态表格视图单元格高度和自动布局教程。

你需要什么：

• 对单元格中的元素设置所需的约束（确保一切都正确完成，如果没有 - 你会遇到很多问题）。还要确保将 IntrinsicSize 设置为 PlaceHolder 值

• 添加一些计算单元格大小的方法

方法：

//this will calculate required height for your cell
-(CGFloat)heightForBasicCellAtIndexPath:(NSIndexPath *)indexPath {
      static UIYourClassCellName *sizingCell = nil;
      //create just once per programm launching
      static dispatch_once_t onceToken;
      dispatch_once(&onceToken, ^{
      sizingCell = [self.tableView dequeueReusableCellWithIdentifier:@"identifierOfCell"];
});
  [self configureBasicCell:sizingCell atIndexPath:indexPath];
  return [self calculateHeightForConfiguredSizingCell:sizingCell];
}
//this method will calculate required height of cell
- (CGFloat)calculateHeightForConfiguredSizingCell:(UITableViewCell *)sizingCell {
      [sizingCell setNeedsLayout];
      [sizingCell layoutIfNeeded];
      CGSize size = [sizingCell.contentView systemLayoutSizeFittingSize:UILayoutFittingCompressedSize];
      return size.height;
}

并打电话

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
  return [self heightForBasicCellAtIndexPath:indexPath];
}

单元配置

- (void)configureBasicCell:(RWBasicCell *)cell atIndexPath:(NSIndexPath *)indexPath {
    //make some configuration for your cell
}

在完成所有操作后，我得到了下一个（单元格内的文本仅作为占位符）：

Answer 2

以下代码对我来说很好用。试试这个

-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {

    CGFloat lRetval = 10;
    CGSize maximumLabelSize = CGSizeMake(231, FLT_MAX);
    CGSize expectedLabelSize;


    CGFloat numberoflines = [thirdcellText length]/17.0;

    if (indexPath.section == 0) {
        expectedLabelSize = [firstcellText sizeWithFont:[UIFont systemFontOfSize:16.0]
                                      constrainedToSize:maximumLabelSize
                                          lineBreakMode:NSLineBreakByWordWrapping];
        lRetval = expectedLabelSize.height;
    }
    else if(indexPath.section == 1)
    {
        expectedLabelSize = [secondcellText sizeWithFont:[UIFont systemFontOfSize:16.0]
                                       constrainedToSize:maximumLabelSize
                                           lineBreakMode:NSLineBreakByWordWrapping];
        lRetval = expectedLabelSize.height;
    }
    else if (indexPath.section == 2)
    {
        expectedLabelSize = [thirdcellText sizeWithFont:[UIFont systemFontOfSize:16.0]
                                       constrainedToSize:CGSizeMake(231, numberoflines*17.0)
                                           lineBreakMode:NSLineBreakByWordWrapping];
        lRetval = expectedLabelSize.height-128.0;
    }

    UIImage *factoryImage = [UIImage imageNamed:NSLocalizedString(@"barcode_factory_reset.png", @"")];

    CGFloat height = factoryImage.size.height;

    if (lRetval < height) {
        lRetval = height+15.0;
    }

    return lRetval;
}

尝试在您的 customcell 类自动布局方法中添加以下代码

textview.frame = frame;
CGRect frame1 = textview.frame;
frame1.size.height = textview.contentSize.height-2;
textview.frame = frame1;


textview.contentSize = CGSizeMake(textview.frame.size.width, textview.frame.size.height);

labelPtr.frame = CGRectMake(CGRectGetMinX(imageView.frame)+CGRectGetMaxX(imageView.frame)+5.0, textview.frame.size.height+10.0, 140, 16.0);
[labelPtr setNeedsDisplayInRect:labelPtr.frame];

尝试设置标签属性，如下所示

labelPtr = [[UILabel alloc] initWithFrame:CGRectZero];
labelPtr.backgroundColor =[UIColor clearColor];
[labelPtr setNeedsLayout];
[labelPtr setNeedsDisplay];
[self.contentView addSubview:labelPtr];

Answer 3

一直在寻找如何正确确定单元格高度 - 看起来 - 这是一个最佳解决方案，boundingRectWithSize 和 constrainedToSize 经常错误地计算文本高度，你需要创建 UILabel 而不是使用 sizeThatFits 函数，见下文

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
    {

    UILabel  * label = [[UILabel alloc] initWithFrame:CGRectMake(8, 5, celllabelWidth, 9999)];
    label.numberOfLines=0;
    label.font = [UIFont fontWithName:fontName size:textSize];
    label.text = @"celllabelTextHere";

    CGSize maximumLabelSize = CGSizeMake(celllabelWidth, 9999);
    CGSize expectedSize = [label sizeThatFits:maximumLabelSize];
    return expectedSize.height;
}

Answer 4

我看到了很多解决方案，但都是错误的或不完整的。你可以用 viewDidLoad 和 autolayout 中的 5 行来解决所有问题。这对于目标 C：

_tableView.delegate = self;
_tableView.dataSource = self;
self.tableView.estimatedRowHeight = 80;//the estimatedRowHeight but if is more this autoincremented with autolayout
self.tableView.rowHeight = UITableViewAutomaticDimension;
[self.tableView setNeedsLayout];
[self.tableView layoutIfNeeded];
self.tableView.contentInset = UIEdgeInsetsMake(20, 0, 0, 0) ;

对于 Swift 2.0：

 self.tableView.estimatedRowHeight = 80
 self.tableView.rowHeight = UITableViewAutomaticDimension      
 self.tableView.setNeedsLayout()
 self.tableView.layoutIfNeeded()
 self.tableView.contentInset = UIEdgeInsetsMake(20, 0, 0, 0)

现在使用 xib 或在 Storyboard 中的 tableview 中创建单元格有了这个，您无需再实现或覆盖。（不要忘记数字 os 行 0）和底部标签（约束）降级“Content Hugging Priority -- Vertical to 250”

您可以在下一个 url 中下载代码： https ://github.com/jposes22/exampleTableCellCustomHeight

参考资料：http ://candycode.io/automatically-resizing-uitableviewcells-with-dynamic-text-height-using-auto-layout/

Answer 5

现在这很简单
使用以下步骤

1. 为您的标签设置约束（如果使用自定义单元格）
2. 行数必须为 0
3. 设置 UITableView 的几个属性

self.tableView.estimatedRowHeight = 100.0;
self.tableView.rowHeight = UITableViewAutomaticDimension;

享受：）
有关更多详细信息，您可以查看
www.raywenderlich.com
stackoverflow.com

Answer 6

你能试试这个吗？

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
    {
     int topPadding = cell.yourLabel.frame.origin.x;
     int bottomPadding = cell.frame.size.heigth-(topPadding+cell.yourLabel.frame.size.height);
     NSString *text = [DescArr objectAtIndex:[indexPath row]];
     CGSize maximumSize = CGSizeMake(cell.yourLabel.frame.size.width, 9999);
     CGSize expectedSize = [text sizeWithFont:yourCell.yourLabel.font constrainedToSize:maximumSize lineBreakMode:yourCell.yourLabel.lineBreakMode];

     return topPadding+expectedSize.height+bottomPadding;
}

Answer 7

请参阅此链接您正在使用自动布局

否则你可以使用下面的方法

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


NewsVCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath];

if (cell == nil)
{

    cell = [[NewsVCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"Cell"];

}

cell.titleCell.numberOfLines = 0;
cell.descriptionCell.numberOfLines = 0;

cell.titleCell.font = [UIFont systemFontOfSize:12.0f];
cell.descriptionCell.font = [UIFont systemFontOfSize:12.0f];

cell.descriptionCell.textColor = [UIColor lightGrayColor];


CGSize maximumLabelSize;

if([UIDevice currentDevice].userInterfaceIdiom==UIUserInterfaceIdiomPad || [[[UIDevice currentDevice] model] isEqualToString:@"iPad Simulator"])
{
    maximumLabelSize = CGSizeMake(768, 10000);

}
else
{
    maximumLabelSize = CGSizeMake(270, 10000);

}

NSString *newsTitle =  [[feeds objectAtIndex:indexPath.row] objectForKey: @"title"];

NSString *descriptionsText = [[feeds objectAtIndex:indexPath.row] objectForKey: @"description"];


CGSize expectedTitleLabelSize = [newsTitle sizeWithFont: cell.titleCell.font constrainedToSize:maximumLabelSize lineBreakMode:cell.titleCell.lineBreakMode];

CGSize expectedDescriptionLabelSize = [descriptionsText sizeWithFont:cell.descriptionCell.font constrainedToSize:maximumLabelSize lineBreakMode:cell.descriptionCell.lineBreakMode];

NSLog(@"cellForRowAtIndexPath :indexpath.row %d: height expectedTitleLabelSize:%f , indexpath.row height expectedDescriptionLabelSize:%f",indexPath.row,expectedTitleLabelSize.height,expectedDescriptionLabelSize.height);



if (newsTitle.length > 0)
{

    cell.titleCell.frame = CGRectMake(20.0f, 10.0f, 270.0f ,expectedTitleLabelSize.height+20.0f);

}
else
{
     cell.titleCell.frame = CGRectMake(20.0f, 10.0f, 270.0f ,expectedTitleLabelSize.height-20.0f);
}


if (descriptionText.length > 0)
{
    cell.descriptionCell.frame =  CGRectMake(20.0f, 10.0f + cell.titleCell.frame.size.height, 270.0f, expectedDescriptionLabelSize.height+20.0f);

}
else
{
    cell.descriptionCell.frame =  CGRectMake(20.0f, cell.titleCell.frame.size.height, 270.0f, 0.0f);

}


  cell.descriptionCell.frame =  CGRectMake(20.0f, 10.0f + cell.titleCell.frame.size.height, 270.0f, expectedDescriptionLabelSize.height+20.0f);

cell.titleCell.text = newsTitle;
cell.descriptionCell.text = descriptionsText;

NSLog(@"indexpath.row %d :title %@ ",indexPath.row,newsTitle);

NSLog(@"indexpath.row %d :description %@",indexPath.row,descriptionsText);

return cell;

 }

杂注标记 - UITableViewDelegate

   - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
 {
float totalHeight = 0.0f;

UILabel *labelTitle;


CGSize maximumLabelSize;


if([UIDevice currentDevice].userInterfaceIdiom==UIUserInterfaceIdiomPad || [[[UIDevice currentDevice] model] isEqualToString:@"iPad Simulator"])
{
    labelTitle = [[UILabel alloc]initWithFrame:CGRectMake(0.0f, 0.0f, 692.0f, 20.0f)];  // iPad
    maximumLabelSize = CGSizeMake(768.0f, 10000.0f);

}
else
{
    labelTitle = [[UILabel alloc]initWithFrame:CGRectMake(0.0f, 0.0f, 270.0f, 20.0f)];
    maximumLabelSize = CGSizeMake(270.0f, 10000.0f);

}



labelTitle.font = [UIFont systemFontOfSize:12.0f];


NSString *newsTitle;
NSString *newsDescription;

  //  cell.titleCell.text = [[feeds objectAtIndex:indexPath.row] objectForKey: @"title"];
  //   cell.descriptionCell.text = [[feeds objectAtIndex:indexPath.row] objectForKey: @"description"];



    newsTitle = [[feeds objectAtIndex:indexPath.row] objectForKey: @"title"];

    newsDescription = [[feeds objectAtIndex:indexPath.row] objectForKey: @"description"];

NSLog(@"indexpath.row %d :newsDescription.length %d",indexPath.row,newsDescription.length);
CGSize expectedTitleLabelSize;
CGSize expectedDescriptionLabelSize;


if (newsTitle.length > 0)
{
    expectedTitleLabelSize = [newsTitle sizeWithFont:labelTitle.font constrainedToSize:maximumLabelSize lineBreakMode:labelTitle.lineBreakMode];
    totalHeight = totalHeight + 20.0f;
}
else
{
    expectedTitleLabelSize = CGSizeMake(0.0f, 0.0f);
    totalHeight = -20.0f;
}

if (newsDescription.length > 0)
{
    expectedDescriptionLabelSize = [newsDescription sizeWithFont:labelTitle.font constrainedToSize:maximumLabelSize lineBreakMode:labelTitle.lineBreakMode];
    totalHeight = totalHeight + 20.0f;

}
else
{
    expectedDescriptionLabelSize = CGSizeMake(0.0f, 0.0f);
    totalHeight = -20.0f;
}


//  NSLog(@"question: %f title:%f",expectedQuestionLabelSize.height,expectedTitleLabelSize.height);

totalHeight = expectedDescriptionLabelSize.height + expectedTitleLabelSize.height + 30.0f+20.0f;




return totalHeight;

 }

Answer 8

如果要将最大高度限制为 100 pt，则必须MIN改用 on MAX：

CGFloat height = fmin(size.height, 100.0);

Answer 9

要设置行高和估计行高的自动尺寸，请确保执行以下步骤，自动尺寸对单元格/行高布局有效。

• 分配和实现tableview dataSource和delegate
• 分配UITableViewAutomaticDimension给 rowHeight 和estimatedRowHeight
• 实现委托/数据源方法（即heightForRowAt并返回一个值UITableViewAutomaticDimension给它）

-

@IBOutlet weak var table: UITableView!

override func viewDidLoad() {
    super.viewDidLoad()

    // Don't forget to set dataSource and delegate for table
    table.dataSource = self
    table.delegate = self

    // Set automatic dimensions for row height
    // Swift 4.2 onwards
    table.rowHeight = UITableView.automaticDimension
    table.estimatedRowHeight = UITableView.automaticDimension


    // Swift 4.1 and below
    table.rowHeight = UITableViewAutomaticDimension
    table.estimatedRowHeight = UITableViewAutomaticDimension

}



// UITableViewAutomaticDimension calculates height of label contents/text
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
    // Swift 4.2 onwards
    return UITableView.automaticDimension

    // Swift 4.1 and below
    return UITableViewAutomaticDimension
}

对于 UITableviewCell 中的标签实例

• 设置行数 = 0（& 换行模式 = 截断尾部）
• 设置关于其超级视图/单元格容器的所有约束（顶部、底部、左右）。
• 可选：设置标签的最小高度，如果你想要标签覆盖的最小垂直区域，即使没有数据。

Answer 10

我刚刚写了这个问题以及我最终选择的方法。你可以在这里阅读：Dynamic UITableView Cell Height Based on Contents

基本上，我创建了一个 UITableView 子类来处理默认和自定义单元格的所有这些。它可能需要调整，但我已经按原样使用它，效果很好。

你可以在这里获取代码：https ://github.com/danielsaidi/DSTableViewWithDynamicHeight

希望它有帮助（......如果没有，我很抱歉，很想听听为什么不）

Answer 11

我需要一个基于该单元格中显示的文本量的动态表格视图单元格高度。我以这种方式解决了它：

    - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
    {
        if (!isLoading)
        {

            if ([self.conditionsDataArray count]>0)
            {
                Conditions *condition =[self.conditionsDataArray objectAtIndex:indexPath.row];
                int height;
                UITextView *textview = [[UITextView alloc] initWithFrame:CGRectMake(0, 0, 236, 0)];   //you can set your frame according to your need
                textview.text  = condition.comment;
                textview.autoresizingMask = UIViewAutoresizingFlexibleHeight;
                [tableView addSubview:textview];
                textview.hidden = YES;
                height = textview.contentSize.height;
                NSLog(@"TEXT VIEW HEIGHT %f", textview.contentSize.height);
                [textview removeFromSuperview];
                [textview release];
                return height;
       }
       return 55;  //Default height, if data is in loading state
}

请注意，文本视图已添加为子视图，然后被隐藏，因此请确保将其添加为子视图，否则将不考虑它的高度。

Answer 12

试试这个，它就像一个魅力！为了我，

在 viewDidLoad 中写下这段代码，

-(void)viewDidLoad 
{
[super viewDidLoad];
 self.tableView.estimatedRowHeight = 100.0; // for example. Set your average height
 self.tableView.rowHeight = UITableViewAutomaticDimension;
}

在 cellForRowAtIndexPath 中写下这段代码，

 -(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
 {
  static NSString *CellIdentifier = @"Cell";
  UITableViewCell *cell = [tableView 
  dequeueReusableCellWithIdentifier:CellIdentifier];
 if (cell == nil) {
    cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] ;
  }
    cell.textLabel.numberOfLines = 0; // Set label number of line to 0
    cell.textLabel.text=[[self.arForTable objectAtIndex:indexPath.row] valueForKey:@"menu"];
    [cell.textLabel sizeToFit]; //set size to fit 
    return cell;
 }

希望这对某些人有所帮助。