Ios 将tableView单元格展开和折叠到标签'；s文本_Ios_Objective C_Uitableview

Ios 将tableView单元格展开和折叠到标签'；s文本

ios objective-c uitableview

Ios 将tableView单元格展开和折叠到标签'；s文本,ios,objective-c,uitableview,Ios,Objective C,Uitableview,我在TableViewCell中有一个标签，其中有多行文本。最初在标签上仅显示一行。我在那个手机上有一个按钮。我想通过单击按钮将单元格扩展到标签文本的最高位 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"tabCell"; _cell = [table

我在TableViewCell中有一个标签，其中有多行文本。最初在标签上仅显示一行。我在那个手机上有一个按钮。我想通过单击按钮将单元格扩展到标签文本的最高位

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
   static NSString *CellIdentifier = @"tabCell";
   _cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];

// Configure the cell...
   NSManagedObject *device = [self.persons objectAtIndex:indexPath.row];

   UILabel *nameLabel = (UILabel*)[_cell.contentView viewWithTag:2];
  nameLabel.text = [NSString stringWithFormat:@"%@", [device valueForKey:@"name"]];

   UILabel *dateLabel = (UILabel *)[_cell.contentView viewWithTag:3];
   dateLabel.text = [NSString stringWithFormat:@"%@",[device valueForKey:@"date"]];

   UILabel *descLabel = (UILabel *)[_cell.contentView viewWithTag:4];
//descTextView.text = [NSString stringWithFormat:@"%@",[device valueForKey:@"desc"]];


   UIImageView *personImage = (UIImageView *)[_cell.contentView viewWithTag:1];
   UIImage *personImg = [UIImage imageWithData:[device valueForKey:@"image"]];
   personImage.image = personImg;

    UIButton *viewMoreButton = (UIButton *)[_cell.contentView viewWithTag:5];
    [viewMoreButton addTarget:self
             action:@selector(myAction)
   forControlEvents:UIControlEventTouchUpInside];

    NSAttributedString *attrString = [[NSAttributedString alloc] initWithString:[device valueForKey:@"desc"]
                                                                 attributes:@{ NSFontAttributeName:[UIFont fontWithName:@"HelveticaNeue" size:17]}];


    reqFrame=[attrString boundingRectWithSize:CGSizeMake(descLabel.frame.size.height, CGFLOAT_MAX)options:NSStringDrawingUsesLineFragmentOrigin
                                  context:nil];


    descLabel.attributedText = attrString;




    return _cell;
}

- (void)myAction{

   //what to write here?

}

首先，在

cellforrowatinexpath

中构建单元格不是一个好的做法。改用

willDisplayCell

其次，要执行所需操作，必须在

heightforrowatinexpath

中设置所需的高度。完成后，在按钮选择器调用中使用

[tableView reloadRowsAtIndexPaths:[NSArray arrayWithObjects:indexPathOfYourCell, nil] withRowAnimation:UITableViewRowAnimationAutomatic];

实施情况类似：

- (void)buttonSelector
{
    myLabel.text = @"YOUR TEXT";
    [myLabel sizeToFit];
    [tableView reloadRowsAtIndexPaths:[NSArray arrayWithObjects:indexPathOfYourCell, nil] withRowAnimation:UITableViewRowAnimationAutomatic];
}

-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
    ...
    return yourLabel.height;
}

无论如何，需要获取单元格的引用和indexath，在
myAction（）
中点击该按钮
创建一个私有变量
CGFloat newCellHeight并将其初始化为0.0。让关联单元格的引用为selectedCell ，所选索引路径为indexPathOfTappedCell - (void)myAction{ UILabel *descLabel = (UILabel*)[selectedCell.contentView viewWithTag:4]; [descLabel sizeToFit]; // Automatically increases the height of the label as required newCellHeight = CGRectGetMaxY(descLabel.frame) + 10.0; // Extra padding 10.0 [tableView reloadRowsAtIndexPaths:@[indexPathOfTappedCell] withRowAnimation:UITableViewRowAnimationAutomatic]; } 现在在视图控制器中添加以下TableView委托方法 -(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{ if (indexPath.section == indexPathOfTappedCell.section && indexPath.row == indexPathOfTappedCell.row ) { return newCellHeight; } return 44.0; // Suppose default height is 44.0 } 您需要维护两个变量，只需将标记赋予按钮，并通过其标记在操作中检测以重新加载特定单元格，以及另一个BOOL变量来检测按钮是否被触碰。您应该使用heightForRowAtIndexPath方法计算高度。我张贴代码，它可能会帮助你 -(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{ if(isReadMoreButtonTouched && [indexPath row]== indexOfReadMoreButton) { NSString *yourText = [arr1 objectAtIndex:indexPath.row]; // your text NSDictionary *attributes = [NSDictionary dictionaryWithObjectsAndKeys: [UIFont fontWithName:@"Avenir Next" size:14], NSFontAttributeName, [UIColor grayColor], NSForegroundColorAttributeName, nil]; // set custom attributes NSAttributedString *attributedText = [[NSAttributedString alloc] initWithString:yourText attributes:attributes]; CGRect paragraphRect = [attributedText boundingRectWithSize:CGSizeMake(625, CGFLOAT_MAX) options:(NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading) context:nil]; //here 625 is width of label NSLog(@"height = %f", paragraphRect.size.height); return paragraphRect.size.height; } else{ return 200; //default height taken in storyboard } } -(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{ cell = [tableView dequeueReusableCellWithIdentifier:@"cell"]; cell.lblKB.text = [arr objectAtIndex:indexPath.row]; cell.lblDetail.text = [arr1 objectAtIndex:indexPath.row]; NSString *yourText = [arr1 objectAtIndex:indexPath.row]; NSDictionary *attributes = [NSDictionary dictionaryWithObjectsAndKeys: [UIFont fontWithName:@"Avenir Next" size:14], NSFontAttributeName, GrayColor, NSForegroundColorAttributeName, nil]; //your custom attributes NSAttributedString *attributedText = [[NSAttributedString alloc] initWithString:yourText attributes:attributes]; CGRect paragraphRect = [attributedText boundingRectWithSize:CGSizeMake(625, CGFLOAT_MAX) options:(NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading) context:nil]; NSLog(@"height = %f", paragraphRect.size.height); if (paragraphRect.size.height<200) { cell.btnMore.hidden = YES; } else{ cell.btnMore.hidden = NO; } cell.btnMore.tag = indexPath.row; return cell; } // action of button click -(IBAction)MoreBtnClicked:(id)sender { if (!isReadMoreButtonTouched) { isReadMoreButtonTouched = YES; } else{ isReadMoreButtonTouched = NO; } indexOfReadMoreButton = [sender tag]; NSIndexPath *indexPath = [NSIndexPath indexPathForRow:[sender tag] inSection:0]; [self.tblKB reloadRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic]; //reload that cell of your tableview } -（CGFloat）tableView:（UITableView*）tableView rowatinexpath的高度：（nsindepath*）indepath{ 如果（isReadMoreButtonTouched&&[indexPath行]==indexOfReadMoreButton）{ NSString*yourText=[arr1 objectAtIndex:indexath.row]；//您的文本 NSDictionary*属性=[NSDictionary Dictionary WithObjectsAndKeys: [UIFont fontWithName:@“Avenir Next”大小：14]，NSFontAttributeName， [UIColor grayColor]，NSForegroundColorAttributeName， nil]；//设置自定义属性 NSAttributedString*attributedText=[[NSAttributedString alloc]initWithString:yourText属性：属性]； CGRect PARATRAPHRECT=[attributedText BoundingDirectWithSize:CGSizeMake（625，CGFLOAT_MAX）选项：（NSStringDrawingUserLineFragmentOrigin | NSStringDrawingUserFontLeading）上下文：nil]；//这里625是标签的宽度 NSLog（@“height=%f”，paragraphRect.size.height）；返回段落rect.size.height； } 否则{ return 200；//脚本中的默认高度 } } -（UITableViewCell*）tableView:（UITableView*）tableView cellForRowAtIndexPath:（NSIndexPath*）indexPath{ cell=[tableView dequeueReusableCellWithIdentifier:@“cell”]； cell.lblKB.text=[arr objectAtIndex:indexath.row]； cell.lblDetail.text=[arr1 objectAtIndex:indexath.row]； NSString*yourText=[arr1 objectAtIndex:indexath.row]； NSDictionary*属性=[NSDictionary Dictionary WithObjectsAndKeys: [UIFont fontWithName:@“Avenir Next”大小：14]，NSFontAttributeName，灰色，NSForegroundColorAttributeName， nil]；//您的自定义属性 NSAttributedString*attributedText=[[NSAttributedString alloc]initWithString:yourText属性：属性]； CGRect PARATRAPHRECT=[attributedText BoundingDirectWithSize:CGSizeMake（625，CGFLOAT_MAX）选项：（NSStringDrawingUserLineFragmentOrigin | NSStringDrawingUserFontLeading）上下文：无]； NSLog（@“height=%f”，paragraphRect.size.height）； if（paragraphRect.size.heights）但是如何扩展到标签文本的高度sir？在heightForRowAtIndexPath中返回标签的高度。为了获得标签，可以将其存储在某个集合中，或者给它一个标签，然后使用[view subViewWithTag:tag]检索它起初，标签仅显示两行文本。但单击按钮后，单元格和标签的高度将展开并显示全文。这是我的要求。@MishaGood。我写的内容肯定会对您有所帮助。在此之前，在按钮选择器中，您可以将全文指定给按钮并调用[标签尺寸合适]使标签设置显示整个文本所需的最小宽度和高度。我们是否可以将此讨论转移到chat@Misha？indexPathOfTappedCell和indexPath.row应该相同。不是吗？@Sauvik？indexPath.row哪一个？索引路径包含节和行。其中indexPath.row仅包含行号。未存储节值。只有一个你只要告诉我按钮的动作应该写些什么就行了？我两天之内就做不成这件事了（@Sauvik DaThe indexPath.section==INDEXPATHOFTCAPEDCELL.section将其更改为indexPath.section==0。无论如何，您是否准备好在按钮点击事件中引用单元格和索引路径？我已经相应地修改了该函数，请让我知道它是否工作。