How to set different height for different rows of UITableView

Question

how can i set different height for different rows of custom ui table view cell in ios? I am trying to change the height depending upon the how much lines there are in my uitextview which is inside my custom uitableview cell.

I tried setting height like this inside my heightForRowAtIndexPath method but it crashes:

PostStreamCell *cell = [tableView cellForRowAtIndexPath:indexPath];
int lines = cell.txtViewMessage.contentSize.height / cell.txtViewMessage.font.lineHeight;

if(lines < 4)
{
    return 100;
}
else if(lines == 4)
{
    return 100;
}
else{
    return 220;
}

Actually don't tell me, it's probably because you're dividing by zero? Table view cells are created after heightForRorAtIndexPath: so you cell objects will also be nil ? Add a breakpoint and see if cell is nil. — CW0007007, Jul 28 '14 at 06:35
possible duplicate of [Change UITableView height dynamically](http://stackoverflow.com/questions/14223931/change-uitableview-height-dynamically) — Hemang, Jan 13 '15 at 12:06

score 1 · Answer 1 · edited Jul 28 '14 at 06:41

1

You can't use cellForRowAtIndexPath in heightForRowAtIndexPath because the cell does not exist. You must retrieve the text by another way without use the cell.

edited Jul 28 '14 at 06:41

Kumar KL

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answered Jul 28 '14 at 06:38

tdelepine

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score 0 · Answer 2 · answered Jul 28 '14 at 06:35

0

Try by using the text boundingRectWithSize.. for calculating the size for cell itself .

Something like this :

 NSString *text = yourTextView.text;
    CGSize size;

    NSDictionary *attributesDictionary = [NSDictionary dictionaryWithObjectsAndKeys:
                                          [UIFont fontWithName:@"Helvetica Neue" size:19], NSFontAttributeName,
                                          nil];
    CGRect fontSizeFor7 = [text boundingRectWithSize:CGSizeMake(525, 500)
                                             options:NSStringDrawingUsesLineFragmentOrigin
                                          attributes:attributesDictionary
                                             context:nil];
    size = fontSizeFor7.size;

    return size.height +40;

answered Jul 28 '14 at 06:35

Kumar KL

15,315
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60

but my uitextview is in custom uitable view cell . how can i access that cell and get size of that uitextview ? – warzone_fz Jul 28 '14 at 06:38
1

Ok, Why can't you access the UITextView in the custom cell within the `heightForRowAtIndexPath` delegate. – Kumar KL Jul 28 '14 at 06:41
if i do that then only 1st row at indexpath is selected – warzone_fz Jul 28 '14 at 06:43
See there are many ways, you can hold in array of texts before the UItableView, Or just do with conditions accordingly for each rows – Kumar KL Jul 28 '14 at 06:48

score 0 · Answer 3 · answered Jul 28 '14 at 07:52

I suggest you to count int lines in viewDidLoad method using length of your text field. Then store it in some array and use it values in your heightForRowAtIndexPath method. It should look like this

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (myLinesArray[indexPath.row] =< 4)
{
    return 100;
}
else return 220;
}

Sheamus · Answer 4 · 2015-01-12T23:52:37.857

You are setting the height correctly--however, you probably shouldn't retrieve a cell within heightForRowAtIndexPath by calling cellForRowAtIndexPath, that is unless your cells are already statically created. A bare-bones implementation of heightForRowAtIndexPath (below) doesn't crash, so the problem probably lies elsewhere in your view controller implementation, or elsewhere.

Also noticed that you are dividing by a dynamic value to get the height. Check your PostStreamCell--if the cell object, txtViewMessage, or its font property is nil, then you will be dividing by 0, and that could be causing the crash.

    //Very simple implementation to demo changes in height
    - (CGFloat) tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
    {
        if (indexPath.row % 2) {
            return 60;
        } else {
            return 44;
        }
    }

How to set different height for different rows of UITableView

4 Answers4