CODEWITHSUNDEEP
iosobjective-cautolayout
Evgeniy Kleban
Evgeniy Kleban

Reputation: 6940

How to correctly calculate label size with auto layout

I know there is similar topics, but unfortunately their solution not work as i want. I have a label, with specific font, with constraints from left side equal to 16, and from right side equal to 16 also. So, for calculate expected text height i used this:

CGSize labelSize = [[strMod fineHtmlFromString:mdl.content] sizeWithFont:self.contentLabel.font
                                                               constrainedToSize:CGSizeMake(SCREEN_WIDTH - 32, (FLT_MAX))
                                                                   lineBreakMode:NSLineBreakByWordWrapping];

        self.heightFullSizeLabel = labelSize.height;

32 is a number, that is easily calculated as 16+16 (constraints indent). SCREEN_WIDTH is defined as #define SCREEN_WIDTH [[UIScreen mainScreen] bounds].size.width

Unfortunately, with that logic i get lesser height that i want to, so i had to increase 32 number to 40. Is there a way to precisely calculate label height dynamically with layout?

Upvotes: 0

Views: 99

Answers (2)

Andrea
Andrea

Reputation: 26385

The correct way to know a text container size is to use -sizeToFit or -sizeThatFits:(CGSize)size.
The one you are using asks just the area occupied by a text, but it doesn't take into account padding or other view related stuff that can be applied.
You can see a huge difference in calculation if you use a UItexView that contains a lot of padding on each side

Upvotes: 1

Vignesh Kumar
Vignesh Kumar

Reputation: 598

Try this with your label font.

    CGRect textRect = [text boundingRectWithSize:size
                                     options:NSStringDrawingUsesLineFragmentOrigin
                                  attributes:@{NSFontAttributeName:FONT}
                                     context:nil];

    CGSize size = textRect.size;
    self.heightFullSizeLabel = size.height;

Upvotes: 1

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