Adjust UILabel height depending on the text

Question

Consider I have the following text in a UILabel (a long line of dynamic text):

Since the alien army vastly outnumbers the team, players m

Answer 1

You can get height using below code

You have to pass

1. text 2. font 3. label width

   func heightForLabel(text: String, font: UIFont, width: CGFloat) -> CGFloat {
   
      let label:UILabel = UILabel(frame: CGRect(x: 0, y: 0, width: width, height: CGFloat.greatestFiniteMagnitude))
      label.numberOfLines = 0
      label.lineBreakMode = NSLineBreakMode.byWordWrapping
      label.font = font
      label.text = text
      label.sizeToFit()
   
      return label.frame.height
   }
   

Answer 2

myLabel.text = "your very long text"
myLabel.numberOfLines = 0
myLabel.lineBreakMode = NSLineBreakMode.ByWordWrapping

Please set constraints for UILable in storyboard including top left bottom right

Answer 3

Here is a category version:

UILabel+AutoSize.h #import

@interface UILabel (AutoSize)

- (void) autosizeForWidth: (int) width;

@end

UILabel+AutoSize.m

#import "UILabel+AutoSize.h"

@implementation UILabel (AutoSize)

- (void) autosizeForWidth: (int) width {
    self.lineBreakMode = UILineBreakModeWordWrap;
    self.numberOfLines = 0;
    CGSize maximumLabelSize = CGSizeMake(width, FLT_MAX);
    CGSize expectedLabelSize = [self.text sizeWithFont:self.font constrainedToSize:maximumLabelSize lineBreakMode:self.lineBreakMode];
    CGRect newFrame = self.frame;
    newFrame.size.height = expectedLabelSize.height;
    self.frame = newFrame;
}

@end

Answer 4

UILabel extension based on this answer for Swift 4 and above

extension UILabel {

    func retrieveTextHeight () -> CGFloat {
        let attributedText = NSAttributedString(string: self.text!, attributes: [NSFontAttributeName:self.font])

        let rect = attributedText.boundingRect(with: CGSize(width: self.frame.size.width, height: CGFloat.greatestFiniteMagnitude), options: .usesLineFragmentOrigin, context: nil)

        return ceil(rect.size.height)
    }

}

Can be used like:

self.labelHeightConstraint.constant = self.label.retrieveTextHeight()

Answer 5

You can implement TableViewController's (UITableViewCell *)tableView:cellForRowAtIndexPath method in the following way (for example) :

#define CELL_LABEL_TAG 1

- (UITableViewCell *)tableView:(UITableView *)tableView  cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    NSString *text = @"my long text";

    static NSString *MyIdentifier = @"MyIdentifier";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:MyIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero  reuseIdentifier:identifier] autorelease];
    }

    CGFloat width = [UIScreen mainScreen].bounds.size.width - 50;
    CGFloat height = [self textHeight:text] + 10;
    CGRect frame = CGRectMake(10.0f, 10.0f, width, height);

    UILabel *cellLabel = [[UILabel alloc] initWithFrame:frame];
    cellLabel.tag = CELL_LABEL_TAG;
    cellLabel.textColor = [UIColor blackColor];
    cellLabel.backgroundColor = [UIColor clearColor];
    cellLabel.textAlignment = UITextAlignmentLeft;
    cellLabel.font = [UIFont systemFontOfSize:12.0f];
    [cell.contentView addSubview:cellLabel];
    [cellLabel release];

    return cell;
}

UILabel *label = (UILabel *)[cell viewWithTag:CELL_LABEL_TAG];
label.text = text;
label.numberOfLines = 0;
[label sizeToFit];
return cell;

Also use NSString's sizeWithFont:constrainedToSize:lineBreakMode: method to compute the text's height.

Answer 6

Adding to the above answers:

This can be easily achieved via storyboard.

1. Set constraint for UILabel.(In my case I did top, left and fixed width)
2. Set Number of line to 0 in Attribute Inspector
3. Set Line Break to WordWrap in Attribute Inspector.