[ios] UILabel - auto-size label to fit text?

Is it possible to auto-resize the UILabel box/bounds to fit the contained text? (I don't care if it ends up larger than the display)

So if a user enters "hello" or "my name is really long i want it to fit in this box", it is never truncated and the label is 'widened' accordingly?

I created some methods based Daniel's reply above.

-(CGFloat)heightForLabel:(UILabel *)label withText:(NSString *)text
{
    CGSize maximumLabelSize     = CGSizeMake(290, FLT_MAX);

    CGSize expectedLabelSize    = [text sizeWithFont:label.font
                                constrainedToSize:maximumLabelSize
                                    lineBreakMode:label.lineBreakMode];

    return expectedLabelSize.height;
}

-(void)resizeHeightToFitForLabel:(UILabel *)label
{
    CGRect newFrame         = label.frame;
    newFrame.size.height    = [self heightForLabel:label withText:label.text];
    label.frame             = newFrame;
}

-(void)resizeHeightToFitForLabel:(UILabel *)label withText:(NSString *)text
{
    label.text              = text;
    [self resizeHeightToFitForLabel:label];
}

Here's what I am finding works for my situation:

1) The height of the UILabel has a >= 0 constraint using autolayout. The width is fixed. 2) Assign the text into the UILabel, which already has a superview at that point (not sure how vital that is). 3) Then, do:

    label.sizeToFit()
    label.layoutIfNeeded()

The height of the label is now set appropriately.

If we want that UILabel should shrink and expand based on text size then storyboard with autolayout is best option. Below are the steps to achieve this

Steps

1. Put UILabel in view controller and place it wherever you want. Also put 0 for numberOfLines property of UILabel.

2. Give it Top, Leading and Trailing space pin constraint.

3. Now it will give warning, Click on the yellow arrow.

4. Click on Update Frame and click on Fix Misplacement. Now this UILabel will shrink if text is less and expand if text is more.

I had a huge problems with auto layout. We have two containers inside table cell. Second container is resized depending on Item description (0 - 1000 chars), and row should be resized based on them.

The missing ingredient was bottom constraint for description.

I've changed bottom constraint of dynamic element from = 0 to >= 0.

you can show one line output then set property Line=0 and show multiple line output then set property Line=1 and more

[self.yourLableName sizeToFit];

@implementation UILabel (UILabel_Auto)

- (void)adjustHeight {

    if (self.text == nil) {
        self.frame = CGRectMake(self.frame.origin.x, self.frame.origin.y, self.bounds.size.width, 0);
        return;
    }

    CGSize aSize = self.bounds.size;
    CGSize tmpSize = CGRectInfinite.size;
    tmpSize.width = aSize.width;

    tmpSize = [self.text sizeWithFont:self.font constrainedToSize:tmpSize];

    self.frame = CGRectMake(self.frame.origin.x, self.frame.origin.y, aSize.width, tmpSize.height);
}

@end

This is category method. You must set text first, than call this method to adjust UILabel's height.

This is not as complicated as some of the other answers make it.

Pin the left and top edges

Just use auto layout to add constraints to pin the left and top sides of the label.

After that it will automatically resize.

Notes

• Don't add constraints for the width and height. Labels have an intrinsic size based on their text content.
• Thanks to this answer for help with this.

• No need to set sizeToFit when using auto layout. My complete code for the example project is here:

  import UIKit
  class ViewController: UIViewController {
  
      @IBOutlet weak var myLabel: UILabel!
  
      @IBAction func changeTextButtonTapped(sender: UIButton) {
          myLabel.text = "my name is really long i want it to fit in this box"
      }
  }
  

• If you want your label to line wrap then set the number of lines to 0 in IB and add myLabel.preferredMaxLayoutWidth = 150 // or whatever in code. (I also pinned my button to the bottom of the label so that it would move down when the label height increased.)

• If you are looking for dynamically sizing labels inside a UITableViewCell then see this answer.

Using [label sizeToFit]; will achieve the same result from Daniels Category.

Although I recommend to use autolayout and let the label resize itself based on constraints.

There's also this approach:

[self.myLabel changeTextWithAutoHeight:self.myStringToAssignToLabel width:180.0f];

Use [label sizeToFit]; to adjust the text in UILabel

1. Add missing constraints in storyboard.
2. Select UILabel in storyboard and set the attributes "Line" to 0.
3. Ref Outlet the UILabel to Controller.h with id:label
4. Controller.m and add [label sizeToFit]; in viewDidLoad

You can size your label according to text and other related controls using two ways-

1. For iOS 7.0 and above

   CGSize labelTextSize = [labelText boundingRectWithSize:CGSizeMake(labelsWidth, MAXFLOAT)
                                             options:NSStringDrawingUsesLineFragmentOrigin
                                          attributes:@{
                                                       NSFontAttributeName : labelFont
                                                       }
                                             context:nil].size;
   

before iOS 7.0 this could be used to calculate label size

CGSize labelTextSize = [label.text sizeWithFont:label.font 
                            constrainedToSize:CGSizeMake(label.frame.size.width, MAXFLOAT)  
                                lineBreakMode:NSLineBreakByWordWrapping];

// reframe other controls based on labelTextHeight

CGFloat labelTextHeight = labelTextSize.height;

2. If you do not want to calculate the size of the label's text than you can use -sizeToFit on the instance of UILabel as-

   [label setNumberOfLines:0]; // for multiline label
   [label setText:@"label text to set"];
   [label sizeToFit];// call this to fit size of the label according to text
   

// after this you can get the label frame to reframe other related controls

Fits everytime! :)

    name.text = @"Hi this the text I want to fit to"
    UIFont * font = 14.0f;
    CGSize size = [name.text sizeWithAttributes:@{NSFontAttributeName: font}];
    nameOfAssessment.frame = CGRectMake(400, 0, size.width, 44);
    nameOfAssessment.font = [UIFont systemFontOfSize:font];