How do I calculate the UILabel height dynamically [duplicate]

Answer 1

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

Answer 2

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

    return requiredSize.height;
}

Answer 3

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;
}

Answer 4

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;
}

Answer 5

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;
}

Answer 6

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:

1. Set maxWidth that your label will take
2. Create a new UILabel and set numberOfLines to 0
3. Add Font attributes like custom font name and font size if using custom fonts
4. 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