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@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 |
It's because I offer the ability to my users to resize their label size but I don't want the text to overstep the frame size. So I am trying to evaluate the text min height for the current width and the text min width for the current height.
no problem for the height with your method. But this is not working very well for the width :
I add a small text to the end of the text to estimate if the future resizment would cause the text to overstep, but it doesn't work if the user has used carriage return.
Thanks for this!
thanks! im a newbie. can you say how can we use this in our projects. i couldnt import.
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.
With iOS6 also comes auto layout and constraints. Might want take a look at preferredMaxLayoutWidth
eg: [_yourLabel setPreferredMaxLayoutWidth:200.f];
Thanks! I modified this to calculate the width, but it took just a second!
Nice cat(egory)!
I added it to cocoacats.com
Shorter version:
[label sizeToFit];
or
[label sizeThatFits:maxSize];
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.
It won't cause breakage Abizern, it will merely override the already existing method. That is the behavior of categories.
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;
}
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)];
}
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
That can be done, please let me have a think about it and come back to you in a bit. However, although I understand the geometry of what you're asking, how could this be useful ? You want a label to be as thin as it can be to hold a certain text with a fixed height? Please let me know