How To Split A Long NSString At Word Boundaries

I recently needed to split an NSString to fit in a certain width. Though you can accomplish this with a UILabel with line breaks set to word wrap and number of lines set to zero or more than one, I needed to display a very particular spacing between the two lines. Unfortunately UILabel gives no control over this so I used two carefully placed UILabels to display the text. I hope Apple will add control over multi line UILabel line height in the future.

Anyway, I ended up writing a method that takes the string to be split and the maximum character count and returns an array consisting of the separated strings. Here it is:

- (NSArray *)splitString:(NSString*)str maxCharacters:(NSInteger)maxLength {    
    NSMutableArray *tempArray = [NSMutableArray arrayWithCapacity:1];
    NSArray *wordArray = [str componentsSeparatedByCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
    NSInteger numberOfWords = [wordArray count];
    NSInteger index = 0;
    NSInteger lengthOfNextWord = 0;
    
	while (index < numberOfWords) {
		NSMutableString *line = [NSMutableString stringWithCapacity:1];
		while ((([line length] + lengthOfNextWord + 1) <= maxLength) && (index < numberOfWords)) {
	        lengthOfNextWord = [[wordArray objectAtIndex:index] length];
	        [line appendString:[wordArray objectAtIndex:index]];
	        index++;
                if (index < numberOfWords) {
                    [line appendString:@" "];
                }
	    }
		[tempArray addObject:line];
	}
    return tempArray;
}