#import "NSString+TruncateToWidth.h"
 
#define ellipsis @"�¢ï¿½�¦"
 
@implementation NSString (TruncateToWidth)
 
- (NSString*)stringByTruncatingToWidth:(CGFloat)width withFont:(UIFont *)font
{
  // Create a copy that will be truncated and returned
  NSMutableString *truncatedString = [[self mutableCopy] autorelease];
 
  // 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

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

Truncate a String

iphone

Objective C