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Adjust UILabel to change it's frame according to it's content
@interface UILabel (dynamicSizeMe)
-(float)resizeToFit;
-(float)expectedHeight;
@end
#import "UILabel+dynamicSizeMe.h"
@implementation UILabel (dynamicSizeMe)
-(float)resizeToFit{
float height = [self expectedHeight];
CGRect newFrame = [self frame];
newFrame.size.height = height;
[self setFrame:newFrame];
return newFrame.origin.y + newFrame.size.height;
}
-(float)expectedHeight{
[self setNumberOfLines:0];
[self setLineBreakMode:UILineBreakModeWordWrap];
CGSize maximumLabelSize = CGSizeMake(self.frame.size.width,9999);
CGSize expectedLabelSize = [[self text] sizeWithFont:[self font]
constrainedToSize:maximumLabelSize
lineBreakMode:[self lineBreakMode]];
return expectedLabelSize.height;
}
@end
@serkanerkan
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serkanerkan commented Nov 22, 2012

thanks! im a newbie. can you say how can we use this in our projects. i couldnt import.

@skyebook
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skyebook commented Feb 13, 2013

I know this predates iOS 6, but anyone using this might be interested to know that UILineBreakModeWordWrap is deprecated as of 6.0. Apple recommends the use of NSLineBreakByWordWrapping.

@zaveri
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zaveri commented Feb 15, 2013

With iOS6 also comes auto layout and constraints. Might want take a look at preferredMaxLayoutWidth

eg: [_yourLabel setPreferredMaxLayoutWidth:200.f];

http://developer.apple.com/library/ios/#documentation/uikit/reference/UILabel_Class/Reference/UILabel.html#//apple_ref/occ/instp/UILabel/preferredMaxLayoutWidth

@pokono
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pokono commented Mar 20, 2013

Thanks! I modified this to calculate the width, but it took just a second!

@bobmoff
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bobmoff commented Jul 2, 2013

Nice cat(egory)!

I added it to cocoacats.com

@berkus
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berkus commented Jul 24, 2013

Shorter version:

[label sizeToFit];
or
[label sizeThatFits:maxSize];

@Abizern
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Abizern commented Jul 29, 2013

Daniel, It's also a good idea to use prefixes on method names when you are adding a category to an existing system class. If Apple ever adds resizeToFit this is going to cause breakage.

@ajubbal
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ajubbal commented Sep 26, 2013

It won't cause breakage Abizern, it will merely override the already existing method. That is the behavior of categories.

@WingedDoom
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WingedDoom commented Feb 7, 2014

I've changed -(float)expectedHeight method to work in iOS7 and Xcode 5 without any warnings. Hope it will help someone:

-(float)expectedHeight {

[self setNumberOfLines:0];
[self setLineBreakMode:NSLineBreakByCharWrapping];

UIFont *font = [UIFont systemFontOfSize:14.0]; //Warning! It's an example, set the font, you need

NSDictionary *attributesDictionary = [NSDictionary dictionaryWithObjectsAndKeys:
                                      font, NSFontAttributeName,
                                      nil];

CGSize maximumLabelSize = CGSizeMake(self.frame.size.width,9999);

CGRect expectedLabelRect = [[self text] boundingRectWithSize:maximumLabelSize
                                                     options:(NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading)
                                                  attributes:attributesDictionary
                                                     context:nil];
CGSize *expectedLabelSize = &expectedLabelRect.size;

return expectedLabelSize->height;

}

@emotality
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emotality commented Apr 13, 2016

Thanks @WingedDoom

Your answer made me create this:

    ...
    UILabel *titleLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 320, 80)];
    [titleLabel setText:response[@"title"]];
    [titleLabel setFont:[UIFont fontWithName:@"HelveticaNeue-Bold" size:22]];
    [ATStringHelper setExpectedHeightForLabel:titleLabel maxHeight:80];
    [self.view addSubview: titleLabel];
}

- (void)setExpectedHeightForLabel:(UILabel *)label maxHeight:(CGFloat)maxHeight
{
    [label setNumberOfLines:0];
    [label setLineBreakMode:NSLineBreakByWordWrapping];
    CGSize currentLabelSize = CGSizeMake(label.frame.origin.x, label.frame.origin.y);

    NSDictionary *attributesDictionary = @{NSFontAttributeName:label.font};
    CGSize maximumLabelSize = CGSizeMake(label.frame.size.width, maxHeight);
    CGRect expectedLabelRect = [label.text boundingRectWithSize:maximumLabelSize options:(NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading) attributes:attributesDictionary context:nil];
    CGSize expectedLabelSize = expectedLabelRect.size;
    [label setFrame:CGRectMake(currentLabelSize.width, currentLabelSize.height, expectedLabelSize.width, expectedLabelSize.height)];
}

@niveshchauhan
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niveshchauhan commented Nov 2, 2016

i only wanted to know the size of the label reduces according to the data but it is alwaz in single line....max 45 charc

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