UITextView line limit

NSInteger startChars = 0;

- (BOOL)textView:aView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
    NSInteger numLines;
    numLines = tView.contentSize.height/tView.font.leading;

    if (numLines == 9)
    {
        if (startChars == 0)
        {
            startChars = tView.text.length;
        }

        NSLog(@"StartChars: %d", startChars);

        NSString *lastLine = [[NSString alloc]initWithString:[[tView text] substringFromIndex:startChars]];
        CGSize lineSize = [lastLine sizeWithFont:tView.font forWidth:tView.contentSize.width lineBreakMode:UILineBreakModeWordWrap];
        [lastLine release];

        if (range.length > text.length)
        {
            return YES;
        }
        else if (numLines == 9 && lineSize.width >= tView.contentSize.width - 45)
        {
            return NO;
        }
    }
    else
    {
        startChars = 0;
    }

    return YES;
}