get the last word in a line UITextField

gistfile1.m

    UITextPosition *firstRowStart = self.myTextView.beginningOfDocument;
    UITextPosition *firstRowEnd = [self.myTextView.tokenizer positionFromPosition:firstRowStart
                                                                       toBoundary:UITextGranularityLine
                                                                      inDirection:UITextLayoutDirectionRight];

    NSString *lastWord = nil;
    while (!lastWord) {
        UITextRange *range = [self.myTextView.tokenizer rangeEnclosingPosition:firstRowEnd
                                                               withGranularity:UITextGranularityWord
                                                                   inDirection:UITextLayoutDirectionLeft];
        lastWord = [self.myTextView textInRange:range];
        firstRowEnd = [self.myTextView positionFromPosition:firstRowEnd offset:-1];
        NSLog(@"%@",lastWord);
    }