Change the height of UILabel dynamically based on content - objective-c

Question

I have a UILabel as subview of UIButton and I am passing the value
from another view and populating in UILabel. Now, I want that UILabel
must change its height based on the content.If text is "Hello" it must
be in 1 line but if text is " my text is too long to fit in the
label", it must change its size. I have used
[self.addressLabel sizeToFit];
But for this i need to leave empty space below UILabel. Simply what I
want is that when text strength increases,size of UILabel and UIView
must expand.

Answer 1

Using below you can get the height of the label
text - text of the label
font - font used in label
width - width of the label
-(float) getHeightForText:(NSString*) text withFont:(UIFont*) font andWidth:(float) width{
CGSize constraint = CGSizeMake(width , 20000.0f);
CGSize title_size;
float totalHeight;
SEL selector = #selector(boundingRectWithSize:options:attributes:context:);
if ([text respondsToSelector:selector]) {
title_size = [text boundingRectWithSize:constraint
options:NSStringDrawingUsesLineFragmentOrigin
attributes:#{ NSFontAttributeName : font }
context:nil].size;
totalHeight = ceil(title_size.height);
} else {
title_size = [text sizeWithFont:font
constrainedToSize:constraint
lineBreakMode:NSLineBreakByWordWrapping];
totalHeight = title_size.height ;
}
CGFloat height = MAX(totalHeight, 40.0f);
return height;
}
and create a frame using the height
CGRect frame = questionTitleLbl.frame;
float height = [self getHeightForText:questionTitleLbl.text
withFont:questionTitleLbl.font
andWidth:questionTitleLbl.frame.size.width];
float gap = 2;
cell.questionTitleLbl.frame = CGRectMake(frame.origin.x,
frame.origin.y,
frame.size.width,
height);

Answer 2

Here is the way that i handle this issue:
UILabel *sight = (UILabel *)[cell viewWithTag:100];
sight.text=tmpGroup.title;
sight.frame =CGRectMake(sight.frame.origin.x, sight.frame.origin.y, 191, 21);
sight.font = [UIFont fontWithName:#"RobotoSlab-Bold" size:10];
sight.numberOfLines=0;
sight.lineBreakMode=NSLineBreakByWordWrapping;
[sight sizeToFit];

Answer 3

Use this code its very easy and updated with ios8
add this method to your appconstant file
inline static CGSize getLabelHeightForFont(NSString *fontName,NSString* str, float fontSize, float lblWidth)
{
NSString *text = str;
CGFloat width = lblWidth;
UIFont *font = [UIFont fontWithName:fontName size:fontSize];
NSAttributedString *attributedText =
[[NSAttributedString alloc]
initWithString:text
attributes:#
{
NSFontAttributeName: font
}];
CGRect rect = [attributedText boundingRectWithSize:(CGSize){width, CGFLOAT_MAX}
options:NSStringDrawingUsesLineFragmentOrigin
context:nil];
return rect.size;
}
and finally use this code for dynamic create UILabel
CGFloat lbl_height = getLabelHeightForFont(#"System- System", address, 15, lbl_address.frame.size.width);
lbl_address.numberOfLines = 0;
lbl_address.textAlignment = NSTextAlignmentLeft;
[lbl_address setLineBreakMode:NSLineBreakByWordWrapping];
lbl_address.frame = CGRectMake(lbl_address.frame.origin.x, lbl_address.frame.origin.y, lbl_address.frame.size.width, lbl_height+5);

Answer 4

This is the very simplest function for getting dynamic height for labels. You can just use this function.
Here ceil is the predefind function for returns the smallest integer value.
And MAXHEIGHT is maximum height for uilabel for example you can give 1000 also for future caluclations...
-(CGFloat) getHeightForLabels : (UILabel *) label
{
CGSize widthMaxHeight = CGSizeMake(label.frame.size.width, MAXHEIGHT);
CGSize size;
NSStringDrawingContext *context = [[NSStringDrawingContext alloc] init];
CGSize boundingRect = [label.text boundingRectWithSize:widthMaxHeight
options:NSStringDrawingUsesLineFragmentOrigin
attributes:#{NSFontAttributeName:label.font}
context:context].size;
size = CGSizeMake(ceil(boundingRect.width), ceil(boundingRect.height));
return size.height;
}