Use sizeToFit with lineSpacing

Question

I have a UILabel with several lines. The text is set dynamically, and my label height too, with this native method :

[myLabel sizeToFit];

I have an other method that sets the line spacing in my label :

    NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:@"My long dynamic text"];
    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
    [paragraphStyle setLineSpacing:5];
    [attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [labelText length])];


myLabel.attributedText = attributedString;

The problem is that even if I set the line spacing first, and then call sizeToFit, the new height of my label is to small. It doesn't take in count the line spacing.

It really is a problem as my label is in a UIScrollView and I need the right height.

Answer 1

For getting size of label dynamically based on text length use this method:

/*! Returns the size of the label to display the text provided
    @param text
        The string to be displayed
    @param width
        The width required for displaying the string
    @param fontName
        The font name for the label
    @param fontSize
        The font size for the label
 */
- (CGSize)getSizeForText:(NSString *)text maxWidth:(CGFloat)width font:(NSString *)fontName fontSize:(float)fontSize {
    CGSize constraintSize;
    constraintSize.height = MAXFLOAT;
    constraintSize.width = width;
    NSDictionary *attributesDictionary = [NSDictionary dictionaryWithObjectsAndKeys:
                                          [UIFont fontWithName:fontName size:fontSize], NSFontAttributeName,
                                          nil];

    CGRect frame = [text boundingRectWithSize:constraintSize
                                      options:NSStringDrawingUsesLineFragmentOrigin
                                   attributes:attributesDictionary
                                      context:nil];

    CGSize stringSize = frame.size;
    return stringSize;
}

Answer 2

Try using – boundingRectWithSize:options:context: method of the NSMutableAttributedString. Refer the Apple Docs for more info.