Dynamically Changing Font Size of Uilabel

Dynamically changing font size of UILabel

Single line:

factLabel.numberOfLines = 1;
factLabel.minimumFontSize = 8;
factLabel.adjustsFontSizeToFitWidth = YES;

The above code will adjust your text's font size down to (for example) 8 trying to fit your text within the label.
numberOfLines = 1 is mandatory.

Multiple lines:

For numberOfLines > 1 there is a method to figure out the size of final text through NSString's sizeWithFont:... UIKit addition methods, for example:

CGSize lLabelSize = [yourText sizeWithFont:factLabel.font
                                  forWidth:factLabel.frame.size.width
                             lineBreakMode:factLabel.lineBreakMode];

After that you can just resize your label using resulting lLabelSize, for example (assuming that you will change only label's height):

factLabel.frame = CGRectMake(factLabel.frame.origin.x, factLabel.frame.origin.y, factLabel.frame.size.width, lLabelSize.height);

iOS6

Single line:

Starting with iOS6, minimumFontSize has been deprecated. The line

factLabel.minimumFontSize = 8.;

can be changed to:

factLabel.minimumScaleFactor = 8./factLabel.font.pointSize;

iOS7

Multiple lines:

Starting with iOS7, sizeWithFont becomes deprecated.
Multiline case is reduced to:

factLabel.numberOfLines = 0;
factLabel.lineBreakMode = NSLineBreakByWordWrapping;
CGSize maximumLabelSize = CGSizeMake(factLabel.frame.size.width, CGFLOAT_MAX);
CGSize expectSize = [factLabel sizeThatFits:maximumLabelSize];
factLabel.frame = CGRectMake(factLabel.frame.origin.x, factLabel.frame.origin.y, expectSize.width, expectSize.height);

iOS 13 (Swift 5):

label.adjustsFontSizeToFitWidth = true
label.minimumScaleFactor = 0.5

UILabel dynamically change font size and keep position?

Ended doing this :

let center:CGPoint=editedView.center // first take the center
label.font = label.font.withSize(max*percentage)
label.sizeToFit() // set right size
label.center=center //then set it back

change font size in UILabel based on auto layout (swift)

UILabel has no methods automatically reducing font to fit content size or height - only width.

So you should do it by manually changing font due to size changes (don't forget to test result sizes with UILabel not NSString.sizeWithFont:: results would be slightly different).

You can try to set constraints of your container to preserve UILabel's aspect ratio. This way when you reduce height, width will be reduced too and UILabel.adjustsFontSizeToFitWidth would do it's work. Should be rough, but enough in you case and much easier and faster to implement.

UPDATE

Forgot to mention. I spoke about your concrete example. Behaviour depends on numberOfLines and lineBreakMode. Making the first != 1 and second something like .byTruncatingTail (default value) will display close to necessary (but, for example, will wrap words when width isn't enough - while you expect no wrapping at all).

UILabel Dynamic Font size keep breaking

There is minimum font shrink property is available. it shrinks the font size as minimum ratio with the current point size. If the content become more then the ratio of fonts then it will defiantly shows the truncation dots(...) at the end.

For example :

Here I am setting up the property with minimum font scale is 0.4.

And here you can see different texts applied with the same property.

In first and second label will adjust the font size because content is less and it adjust as per minimum font scale ratio. but in 3rd the minimum font ratio and the content of the label is does not matched then it will show the dots(...) with truncation.

For this issue you should know that how mach content should be shown on that label or for batter use you can use multiline label.

Hope you will get help from the answer.

How to dynamically increase and decrease UILabel's text smoothly as font size varies ios

Instead of changing the font size, you can just use UIView's transform, e.g

self.labelAttendCount.transform = CGAffineTransformMakeScale(1.5, 1.5);

How to make UILabel and UITextField font size to be relative to screen size

You can manually change UIlabel or UITextfield font in viewDidLayoutSubviews method of your ViewController or layoutSubviews method of your superView. Like this:

CGRect screenSize = [UIScreen mainScreen].bounds;
textField.font = [UIFont fontWithName:@"YourFont-Name"  
    size:screenSize.size.width/15.f];

Change the height of UILabel dynamically based on content

Using below you can get the height of the label

• text - text of the label
• font - font used in label

• width - width of the label

  -(float) getHeightForText:(NSString*) text withFont:(UIFont*) font andWidth:(float) width{
      CGSize constraint = CGSizeMake(width , 20000.0f);
      CGSize title_size;
      float totalHeight;
  
      SEL selector = @selector(boundingRectWithSize:options:attributes:context:);
      if ([text respondsToSelector:selector]) {                
          title_size = [text boundingRectWithSize:constraint
                                          options:NSStringDrawingUsesLineFragmentOrigin
                                       attributes:@{ NSFontAttributeName : font }
                                          context:nil].size;
  
          totalHeight = ceil(title_size.height); 
      } else {                
          title_size = [text sizeWithFont:font
                        constrainedToSize:constraint
                            lineBreakMode:NSLineBreakByWordWrapping];                
          totalHeight = title_size.height ;                
      }
  
      CGFloat height = MAX(totalHeight, 40.0f);
      return height;            
  }
  

and create a frame using the height

CGRect frame = questionTitleLbl.frame;

float height = [self getHeightForText:questionTitleLbl.text 
                             withFont:questionTitleLbl.font
                            andWidth:questionTitleLbl.frame.size.width];
float gap = 2;

cell.questionTitleLbl.frame = CGRectMake(frame.origin.x, 
                                         frame.origin.y, 
                                         frame.size.width, 
                                         height);

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