像元大小不会动态变化

Question

I am creating a Iphone app with UITableView. In that I want to change the cell size with respect to text. I used the following code. But it fails.

-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
//    CGRect screenBounds = [[UIScreen mainScreen] bounds];
//    CGSize screenSize = screenBounds.size;

NSStringDrawingContext *ctx = [NSStringDrawingContext new];
NSAttributedString *aString = [[NSAttributedString alloc] initWithString:[message objectAtIndex:0]];
UITextView *calculationView = [[UITextView alloc] init];
[calculationView setAttributedText:aString];
CGRect textRect = [calculationView.text boundingRectWithSize:self.view.frame.size options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:calculationView.font} context:ctx];
//    CGSize size = [calculationView sizeThatFits:CGSizeMake(screenSize.width, FLT_MAX)];
return textRect.size.height;
}



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

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
[cell.textLabel setLineBreakMode:NSLineBreakByWordWrapping];
[cell.textLabel sizeToFit];

if(cell == nil)
{
    cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:simpleTableIdentifier];
}
cell.imageView.image = [UIImage imageNamed:@"gg.jpg"];
cell.textLabel.text = [NSString stringWithFormat:[message objectAtIndex:0], indexPath.row];
return cell;
}

Thanks in advance.

Answer 1

first you need to get text size.. and according this size you can set cell height.. like this example

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


            CGSize contsize={260.00f,3000.00f};
            UIFont *font=[UIFont fontWithName:@"Open Sans" size:15.0];

            NSString *strt11=@"comment_text"

            CGSize fontSize=[test sizeWithFont:font constrainedToSize:contsize lineBreakMode:NSLineBreakByWordWrapping];        
            if (fontSize.height>22)
                return fontSize.height+60.0f;

            return 80.0f;
    }

and also put this code in cellForRowAtIndexPath method for set uilabel height..

Answer 2

Please use the below code.

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


    NSString *text = [array_loaddata objectAtIndex:indexPath.row] ;

        UIFont *font = [UIFont systemFontOfSize:10];
    NSAttributedString *attributedText =
    [[NSAttributedString alloc]
     initWithString:cellText
     attributes:@
     {
     NSFontAttributeName: cellFont
     }];
    CGRect rect = [attributedText boundingRectWithSize:(CGSize){kWIDTH_FOR_MESSAGE_LABEL, MAXFLOAT}
                                               options:NSStringDrawingUsesLineFragmentOrigin
                                               context:nil];


    return rect.size.height + 75;
}


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSString *CellIdentifier =[NSString stringWithFormat:@"Cell%d",indexPath.row] ;

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];

        NSString *text = [array_loaddata objectAtIndex:indexPath.row] ;
        UIFont *font = [UIFont systemFontOfSize:10];
    NSAttributedString *attributedText =
    [[NSAttributedString alloc]
     initWithString:cellText
     attributes:@
     {
     NSFontAttributeName: cellFont
     }];
    CGRect rect = [text boundingRectWithSize:(CGSize){kWIDTH_FOR_MESSAGE_LABEL, MAXFLOAT}
                                               options:NSStringDrawingUsesLineFragmentOrigin
                                               context:nil];  
      UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(46, 0,kWIDTH_FOR_MESSAGE_LABEL, rect.size.height)];
        label.numberOfLines = 0;
        label.textColor = [UIColor grayColor];
        label.lineBreakMode = NSLineBreakByWordWrapping;
        label.text = (text ? text : @"");
        label.font = font;
        label.backgroundColor = [UIColor clearColor];
        [cell.contentView addSubview:label];
        [label release];


    }

Answer 3

As Simple as that :

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