Truncate a String and Append an Ellipsis, Respecting the Font Size http://iosdevelopertips.com/cocoa/truncate-an-nsstring-and-append-an-ellipsis-respecting-the-font-size.html

NSString+TruncateToWidth.h

@interface NSString (TruncateToWidth)
 
- (NSString*)stringByTruncatingToWidth:(CGFloat)width withFont:(UIFont *)font;
 
@end

NSString+TruncateToWidth.m

#import "NSString+TruncateToWidth.h"
 
#define ellipsis @"…"
 
@implementation NSString (TruncateToWidth)
 
- (NSString*)stringByTruncatingToWidth:(CGFloat)width withFont:(UIFont *)font
{
  // Create copy that will be the returned result
  NSMutableString *truncatedString = [[self mutableCopy] autorelease];
 
  // Make sure string is longer than requested width
  if ([self sizeWithFont:font].width > width)
  {
    // Accommodate for ellipsis we'll tack on the end
    width -= [ellipsis sizeWithFont:font].width;
 
    // Get range for last character in string
    NSRange range = {truncatedString.length - 1, 1};
 
    // Loop, deleting characters until string fits within width
    while ([truncatedString sizeWithFont:font].width > width) 
    {
      // Delete character at end
      [truncatedString deleteCharactersInRange:range];
 
      // Move back another character
      range.location--;
    }
 
    // Append ellipsis
    [truncatedString replaceCharactersInRange:range withString:ellipsis];
  }
 
  return truncatedString;
}
 
@end