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Truncate a String

/ Published in: Objective C
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  1. #import "NSString+TruncateToWidth.h"
  2.  
  3. #define ellipsis @"�¢ï¿½�¦"
  4.  
  5. @implementation NSString (TruncateToWidth)
  6.  
  7. - (NSString*)stringByTruncatingToWidth:(CGFloat)width withFont:(UIFont *)font
  8. {
  9.   // Create a copy that will be truncated and returned
  10.   NSMutableString *truncatedString = [[self mutableCopy] autorelease];
  11.  
  12.   // Accommodate for ellipsis we'll tack on the end
  13.   width -= [ellipsis sizeWithFont:font].width;
  14.  
  15.   // Get range for last character in string
  16.   NSRange range = {truncatedString.length - 1, 1};
  17.  
  18.   // Loop, deleting characters until string fits within width
  19.   while ([truncatedString sizeWithFont:font].width > width) 
  20.   {
  21.     // Delete character at end
  22.     [truncatedString deleteCharactersInRange:range];
  23.  
  24.     // Move back another character
  25.     range.location--;
  26.   }
  27.  
  28.   // Append ellipsis
  29.   [truncatedString replaceCharactersInRange:range withString:ellipsis];
  30.  
  31.   return truncatedString;
  32. }
  33.  
  34. @end

URL: http://iphonedevelopertips.com/cocoa/truncate-an-nsstring-and-append-an-ellipsis-respecting-the-font-size.html

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