- (void)textViewDidChange:(UITextView *)textView {

    NSInteger number = [textView.text length];

    if (number > 128) {

        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" message:@"字符个数不能大于128" delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil];

        [alert show];

        textView.text = [textView.text substringToIndex:128];

        number = 128;

        [alert release];

    }

//    self.statusLabel.text = [NSString stringWithFormat:@"%d/128",number];

}