Resize UILabel based on content

7
votes

I have a UILabel, his text size has the property

title.adjustsFontSizeToFitWidth = YES;

that prevents me from using standard methods to resize the UILabel. I read on another post here that I'm supposed to use the function

sizeWithFont:minFontSize:actualFontSize:forWidth:lineBreakMode

from this answer: How to figure out the font size of a UILabel when -adjustsFontSizeToFitWidth is set to YES?

Now, i can't figure out how to make it work.. this is the actual code

UIFont *font = [UIFont fontWithName:@"Marker Felt" size:200];
UILabel *title = [[UILabel alloc] initWithFrame:CGRectMake(0.0, 0.0, width, 20.0)];
title.text = @"this is a long title that should be resized";
title.font = font;
title.numberOfLines = 1;
title.adjustsFontSizeToFitWidth = YES;

CGFloat pointSize = 0.0;
CGSize size = [title.text sizeWithFont:font 
                           minFontSize:title.minimumFontSize 
                        actualFontSize:&pointSize 
                              forWidth:width 
                         lineBreakMode:title.lineBreakMode];
title.frame = CGRectMake(title.frame.origin.x, 
                         title.frame.origin.y, 
                         size.width, 
                         size.height);

The UILabel get resized wrongly, as if the font size it's still 200.. Any clues? Thanks!

5
iosiphoneuilabeluifont
What is title.minimumFontSize? What value is in width variable? – Nekto
there is no minimumFontSize set for now, and width is just the width of the UIView I want this text in (let's suppose it's 200.0) – ksn
try to set it to 10, for example =) If you have fixed width then what do you want to get from size? height? – Nekto
Yes I'm trying to get the height.. Basically the point is to simulate a vertical top text aligment that uilabel doesn't support – ksn
Did you try to set title.minimumFontSize to something lower then 200? – Nekto

5 Answers

8
votes

I have some code you could use on my github, check it out, it's a category for UILabel, you need to set the frame width and when you can resizeToFit on the UILabel, it adjusts the height to fit the content, and returns the y position of the end of the label so you can adjust any content appearing after it.

https://gist.github.com/1005520

6
votes

I'd suggest filing this as a bug.

The size returned by -sizeWithFont:minFontSize:actualFontSize:forWidth:lineBreakMode: has the correct width, but not the height does not account for the actual font size.

It seems likely that UILabel also has this bug. Changing the size of a label to match the height of the text in a font of the size returned by -sizeWithFont:minFontSize:actualFontSize:forWidth:lineBreakMode: will incorrectly vertically position the text within the label.

A work-around is to calculate the correct height, and change the font on the label to with the actual font size:

CGFloat pointSize = 0.0f;
CGRect frame = title.frame;
frame.size = [title.text sizeWithFont:font
                          minFontSize:title.minimumFontSize
                       actualFontSize:&pointSize
                             forWidth:width
                        lineBreakMode:title.lineBreakMode];
UIFont *actualFont = [UIFont fontWithName:@"Marker Felt" size:pointSize];
CGSize sizeWithCorrectHeight = [title.text sizeWithFont:actualFont];
frame.size.height = sizeWithCorrectHeight.height;
title.frame = frame;
title.font = actualFont;
2
votes

Try to create font with smaller fontSize. For example:

UIFont *font = [UIFont fontWithName:@"Marker Felt" size:20];

but to actualFontSize pass link to CGFloat == 200.

UPDATED:

try this then:

UIFont *font = [UIFont fontWithName:@"Marker Felt" size:20];
UILabel *title = [[UILabel alloc] initWithFrame:CGRectMake(0.0, 0.0, width, 20.0)];
title.text = @"this is a long title that should be resized";
title.font = font;
title.numberOfLines = 1;
title.adjustsFontSizeToFitWidth = YES;

CGFloat pointSize = 0.0;
CGSize size = [title.text sizeWithFont:font minFontSize:title.minimumFontSize actualFontSize:&pointSize forWidth:width lineBreakMode:title.lineBreakMode];
title.frame = CGRectMake(title.frame.origin.x, title.frame.origin.y, size.width, size.height);
font = [UIFont fontWithName:@"Marker Felt" size:200];
title.font = font;
0
votes
UILabel * label = [[UILabel alloc] init];
        [label setNumberOfLines:0];
        label.text=[detailDict valueForKey:@"method"];
        [label setFont:[UIFont fontWithName:@"Georgia" size:16.0]];
        CGSize labelsize=[label.text sizeWithFont:label.font constrainedToSize:CGSizeMake(250, 1000.0) lineBreakMode:UILineBreakModeWordWrap];
        int y=0;
        label.frame=CGRectMake(38, y, 245, labelsize.height);
        [label setBackgroundColor:[UIColor clearColor]];
        [label setTextColor:[UIColor whiteColor]];
        scrollView.showsVerticalScrollIndicator = NO;
        y+=labelsize.height;
        [scrollView setContentSize:CGSizeMake(200,y+50)];
        [scrollView addSubview:label];
        [label release];

I think you should use this code and i am using the label on scrollview for a big text you can also do so

0
votes

Have you tried intrinsicContentSize?

    myLable.numberOfLines = 0
    myLable.frame = CGRect(x: 10, y: 10, width: 300, height: lblSuperscript.intrinsicContentSize().height)