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a guest May 19th, 2019 58 Never
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  1. @import CoreText;
  2.  
  3. @implementation NSAttributedString (Size)
  4.  
  5. - (CGFloat)heightForAttributedStringWithWidth:(CGFloat)inWidth {
  6.     if (self.length == 0) {
  7.         return 0;
  8.     }
  9.  
  10.     NSTextStorage *textStorage = [[NSTextStorage alloc]
  11.                                   initWithAttributedString:self];
  12.     NSTextContainer *textContainer = [[NSTextContainer alloc]
  13.                                        initWithSize: CGSizeMake(inWidth, FLT_MAX)];
  14.     NSLayoutManager *layoutManager = [[NSLayoutManager alloc] init];
  15.  
  16.     [layoutManager addTextContainer:textContainer];
  17.     [textStorage addLayoutManager:layoutManager];
  18.  
  19.     UIFont *font = [self attribute:NSFontAttributeName
  20.                            atIndex:0
  21.              longestEffectiveRange:nil
  22.                            inRange:NSMakeRange(0, [textStorage length])];
  23.  
  24.     [textStorage
  25.      addAttribute:NSFontAttributeName value:font
  26.      range:NSMakeRange(0, [textStorage length])];
  27.  
  28.     [textContainer
  29.      setLineFragmentPadding:0.0];
  30.  
  31.     layoutManager.usesFontLeading = false;
  32.  
  33.     [layoutManager
  34.      ensureGlyphsForGlyphRange:NSMakeRange(0, [textStorage length])];
  35.  
  36.     (void) [layoutManager
  37.             glyphRangeForTextContainer:textContainer];
  38.  
  39.     CGFloat height = [layoutManager
  40.             usedRectForTextContainer:textContainer].size.height;
  41.  
  42.     return height;
  43. }
  44.  
  45. @end
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