Use sizeToFit with lineSpacing - ios

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.