Getting uilabel height for bold attributed text - ios

Question

My code to calculate height required to for label is as follows:
-(float)frameForText:(NSString*)text sizeWithFont:(UIFont*)font constrainedToSize: (float)width{
NSDictionary *attributesDictionary = [NSDictionary dictionaryWithObjectsAndKeys:font, NSFontAttributeName, nil];
CGRect frame = [text boundingRectWithSize:(CGSize){width, CGFLOAT_MAX} options: (NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading) attributes:attributesDictionary
context:nil];
// This contains both height and width, but we really care about height.
return frame.size.height;
}
I have called it as follows from below code to calculate height firs then used it to draw label
//form attributed title
NSString *str_title =#"This is sample title to calculate height";
NSMutableParagraphStyle *paragraphStyle = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
[paragraphStyle setLineSpacing: 2.0f];
NSDictionary *attributes = #{ NSFontAttributeName: [UIFont fontWithName:#"PTSans-Bold" size:10], NSParagraphStyleAttributeName: paragraphStyle };
NSAttributedString *attributed_title = [[NSAttributedString alloc] initWithString:str_title attributes:attributes];
//calculate height required for title
float comment_height = [self frameForText:str_title sizeWithFont:[UIFont fontWithName:#"PTSans-Bold" size:10] constrainedToSize:250];
UILabel *lbl_title;
//use calculated height here
lbl_title = [[UILabel alloc] initWithFrame:CGRectMake(60, 5, 250, title_height)];
lbl_title.numberOfLines = 0;
lbl_title.attributedText = attributed_title;
This works fine when font is "PTSans-Regular" and gives exact uilabel height. But, it is not working for "PTSans-Bold" by above code.
How should I return exact UIlabel needed to write "PTSans-Bold" text with label of width 250, font's size 10 and paragraph line spacing equal to 2? Note: the "PTSans-Bold" is not system font, it's font I have added.
Thanks.

Answer 1

This is easyiest way to find UILabel text height dynamically height for below iOS7
CGSize fontSize = [uilabel.text sizeWithFont:uilabel.font];
NSLog(#"height %f",fontSize.height);
for iOS7
float heightIs =[uilabel.text boundingRectWithSize:uilabel.frame.size options:NSStringDrawingUsesLineFragmentOrigin attributes:#{ NSFontAttributeName:uilabel.font } context:nil].size.height;

Answer 2

use the below method after setting font and every properties.
- (CGFloat)getHeight:(UILabel *)label{
CGSize sizeOfText = [label.text boundingRectWithSize: CGSizeMake( self.bounds.size.width,CGFLOAT_MAX)
options: (NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading)
attributes: [NSDictionary dictionaryWithObject:label.font
forKey:NSFontAttributeName]
context: nil].size;
return sizeOfText.height;
}

Answer 3

OK, I solved this problem with below code:
-(float)heightOfAttrbuitedText:(NSAttributedString *)attrStr width:(CGFloat )width{
CGRect rect = [attrStr boundingRectWithSize:CGSizeMake(width, 10000) options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading context:nil];
return rect.size.height;
}