How do I calculate the UILabel height dynamically

Question

I have the following code:

label.numberOfLines = 0; // allows label to have as many lines as needed
label.text = @"some long text";
[label sizeToFit];

How do I get the height of label in points?

Fabio Berger · Answer 1 · 2017-04-01T15:48:07.723

60

The easiest way to get the height is sizeThatFits. Use it like this:

Objective-C

CGFloat maxLabelWidth = 100;
CGSize neededSize = [label sizeThatFits:CGSizeMake(maxLabelWidth, CGFLOAT_MAX)];

Swift 3.0

let maxLabelWidth: CGFloat = 100
let neededSize = label.sizeThatFits(CGSize(width: maxLabelWidth, height: CGFloat.greatestFiniteMagnitude))

The height your label needs is neededSize.height.
Note that im using CGFLOAT_MAX for the size height, to make sure the label has enough place to fit in the CGSize.

The height of your label also depends on your width of the label, thats why I added maxLabelWidth, it makes a difference if the label can be 100pt wide or 200pt.

Hope this helps!

Edit: Make sure you set label.numberOfLines = 0; otherwise neededSize returns the size where the text is in a single line.

Edit: Added Swift version, although the naming is a bit weird, greatestFiniteMagnitude seems to be the correct equivalent for CGFLOAT_MAX.

edited Apr 01 '17 at 15:48

answered Dec 09 '14 at 10:23

Fabio Berger

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1

It worked very nice for me. – Joqus Aug 25 '15 at 17:43
1

This method is better than the accepted answer I guess. – abhimuralidharan Oct 16 '15 at 04:52
1

excellent. short & finer than the accepted one. – Linkon Sid Jan 11 '16 at 12:59
1

@user1007522 Do you set numberOfLines to 0 ? – Fabio Berger Jan 15 '16 at 13:05
@user1007522 I guess you do not, because it's definitely working on iOS9, read my edit. – Fabio Berger Jan 15 '16 at 13:08
numberOfLines is set to 0. EDIT: nvm this works. – user1007522 Jan 15 '16 at 13:25
I wish I could give this answer two up clicks! Thanks @FabioBerger. – Scooter Feb 07 '16 at 16:55
This is absolutely perfect, I'm also using label.frame.size.width so as to dynamically grab the max width of my label to pass as maxLabelWidth – Simon Sebastian Vollmer Jan 29 '19 at 20:35

score 57 · Accepted Answer · edited Jun 10 '16 at 20:19

57

Use following method to calculate dynamic UILabel height:

- (CGFloat)getLabelHeight:(UILabel*)label
{
    CGSize constraint = CGSizeMake(label.frame.size.width, CGFLOAT_MAX);
    CGSize size;

    NSStringDrawingContext *context = [[NSStringDrawingContext alloc] init];
    CGSize boundingBox = [label.text boundingRectWithSize:constraint
                                                  options:NSStringDrawingUsesLineFragmentOrigin
                                               attributes:@{NSFontAttributeName:label.font}
                                                  context:context].size;

    size = CGSizeMake(ceil(boundingBox.width), ceil(boundingBox.height));

    return size.height;
}

edited Jun 10 '16 at 20:19

Philippe

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answered Dec 09 '14 at 08:52

Salman Zaidi

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how is the UILabel alloc init'd? – cdub Dec 09 '14 at 09:10
Will this work an NSMutableAttributedString as well? – cdub Dec 09 '14 at 09:27
1

YES.. change `label.text` to `label.attributedText` to call `boundingRectWithSize` method – Salman Zaidi Dec 09 '14 at 09:46
Works like a charm, only one edit, need to get rid of attributes if you want to use an attributedText as well. – cdub Dec 14 '14 at 08:33
Is there a point to creating a new `NSStringDrawingContext`? – Mike Jun 29 '15 at 16:27
It looks like `ceil(boundingBox.height)` isn't quite right, on retina devices UILabel seems to round to the nearest .5 points. I'm going to try using `ceil(boundingBox.height * scale) / scale`, does anyone know if this is the right thing to do? – Pierre Houston Jan 29 '16 at 01:23
please what is the unit of the returned height? – Ne AS Feb 09 '17 at 18:01
@NeAS ... CGFloat – Chris Allinson Mar 02 '18 at 01:34
thanks, this worked for me when many other slightly different solutions didn't work for me. the keypoint from your solution that made the difference for me was ```ceil(boundingBox.height)``` – markckim Jan 16 '19 at 07:52

score 7 · Answer 3 · edited May 23 '17 at 12:18

7

Just use [label sizeThatFits:label.frame.size]; and it will return the size of label which will fit for given text. Or you can also follow the question

edited May 23 '17 at 12:18

Community

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answered Dec 09 '14 at 08:46

iHulk

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For Swift4 I user this: label.sizeThatFits(label.frame.size).height and it works perfectly, numberOfLines are 0 – clopex Nov 21 '19 at 09:42

score 6 · Answer 4 · answered Jun 25 '16 at 11:54

For those who want to estimate the size a label takes in a method which estimates header / cell height in UICollectionView or UITableView, follow this:

Set maxWidth that your label will take
Create a new UILabel and set numberOfLines to 0
Add Font attributes like custom font name and font size if using custom fonts
Set text for this label and get estimated height using sizeThatFits. Label height is neededHeight.height

Swift Version

let maxLabelWidth:CGFloat = collectionView.frame.width - 20
let label = UILabel()
label.numberOfLines = 0
let addressFont = [ NSFontAttributeName: UIFont(name: "OpenSans", size: 12.0)! ]
let addr = "Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum."
label.attributedText = NSMutableAttributedString(string: addr , attributes: addressFont )
let neededSize:CGSize = label.sizeThatFits(CGSizeMake(maxLabelWidth, CGFloat.max))
let labelHeight = neededSize.height

Thanks to @FabioBerger

score 2 · Answer 5 · answered Feb 03 '16 at 01:58

I edited Salman Zaidi's answer a little to make it work better for myself. It works well if you don't have direct access to a label, like when you are trying to get label height in heightForRowAtIndexPath:

-(CGFloat)getLabelHeight:(CGSize)labelSize string: (NSString *)string font: (UIFont *)font{

    CGSize size;

    NSStringDrawingContext *context = [[NSStringDrawingContext alloc] init];
    CGSize boundingBox = [string boundingRectWithSize:labelSize
                                                  options:NSStringDrawingUsesLineFragmentOrigin
                                               attributes:@{NSFontAttributeName:font}
                                                  context:context].size;

    size = CGSizeMake(ceil(boundingBox.width), ceil(boundingBox.height));

    return size.height;
}

score 2 · Answer 6 · answered Aug 10 '16 at 07:25

You can Create Label dynamically :

-(CGRect)newLableSize:(NSString *)lableString
{
     NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
     [paragraphStyle setLineBreakMode:NSLineBreakByWordWrapping];

        CGFloat tempwidth = YourStaticLabelWidth * ScreenWidth / 320;
        NSMutableArray *array=[[NSMutableArray alloc]initWithObjects: lableString,nil];
       CGRect newLabelsize = [[array objectAtIndex:0] boundingRectWithSize:CGSizeMake(tempwidth, MAXFLOAT)  options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:selectFont,NSParagraphStyleAttributeName:paragraphStyle} context:nil];   

        NSLog(@"New Label Size Width  : %f",newLabelsize.size.width);
        NSLog(@"New Label Size Height : %f",newLabelsize.size.height);

        return newLabelsize;
}

can you tell me one thing that 320 is the static value or can we do its dynamic? — Kaushik Movaliya, Dec 05 '18 at 11:29

score 1 · Answer 7 · answered Apr 15 '16 at 22:04

I'm adjust height, with 2 lines in my label

lblUserQuestion.preferredMaxLayoutWidth = 100.0f;

100.0f, it's a size i wanted, and another line,

[lblUserQuestion sizeToFit];

My method complete is,

UILabel *lblUserQuestion = [[UILabel alloc] initWithFrame:CGRectMake(61, 25, self.frame.size.width-61-20, 37.0f)];
    lblUserQuestion.numberOfLines= 0;
    lblUserQuestion.font =[UIFont fontWithName:@"HelveticaNeue-Thin" size:14.];
lblUserQuestion.adjustsFontSizeToFitWidth = YES;
    lblUserQuestion.minimumScaleFactor = 0.5;
    lblUserQuestion.preferredMaxLayoutWidth= 100.0f;
    lblUserQuestion.text = _photoToVote.label;

score 1 · Answer 8 · answered Sep 09 '16 at 13:20

- (CGFloat)getTextHeightByWidth:(NSString*)text textFont:(UIFont*)textFont textWidth:(float)textWidth {

    if (!text) {
        return 0;
    }
    CGSize boundingSize = CGSizeMake(textWidth, CGFLOAT_MAX);
    NSAttributedString *attributedText = [[NSAttributedString alloc] initWithString:text attributes:@{ NSFontAttributeName: textFont }];

    CGRect rect = [attributedText boundingRectWithSize:boundingSize options:NSStringDrawingUsesLineFragmentOrigin context:nil];
    CGSize requiredSize = rect.size;
    return requiredSize.height;
}

- (CGFloat)getTextWidthByHeight:(NSString*)text textFont:(UIFont*)textFont textHeight:(float)textHeight {

    if (!text) {
        return 0.0f;
    }
    CGSize boundingSize = CGSizeMake(CGFLOAT_MAX, textHeight);

    NSAttributedString *attributedText = [[NSAttributedString alloc] initWithString:text
                                                                         attributes:@{ NSFontAttributeName: textFont }];

    CGRect rect = [attributedText boundingRectWithSize:boundingSize
                                               options:NSStringDrawingUsesLineFragmentOrigin
                                               context:nil];
    CGSize requiredSize = rect.size;
    return requiredSize.width;
}

Ashokios · Answer 9 · 2015-11-03T11:39:30.143

-2

 - (CGFloat)getLabelsize:(UILabel *)label
{
    CGSize maxSize = CGSizeMake(label.frame.size.width, 9999);
    CGSize requiredSize = [label sizeThatFits:maxSize];

    return requiredSize.height;
}

edited Nov 03 '15 at 11:39

answered Dec 09 '14 at 13:52

Ashokios

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5

score -2 · Answer 10 · answered Jul 06 '15 at 12:20

Use this function

+ (CGFloat)heightForText:(NSString*)text font:(UIFont*)font withinWidth:(CGFloat)width {

    CGSize constraint = CGSizeMake(width, 20000.0f);
    CGSize size;

    CGSize boundingBox = [text boundingRectWithSize:constraint
                                                  options:NSStringDrawingUsesLineFragmentOrigin
                                               attributes:@{NSFontAttributeName:font}
                                                  context:nil].size;

    size = CGSizeMake(ceil(boundingBox.width), ceil(boundingBox.height));

    return size.height;
}

check the @Salman Zaidi answer, please not repeat answers – jose920405 Feb 04 '16 at 13:23 — jose920405, Feb 04 '16 at 13:23

How do I calculate the UILabel height dynamically

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