UITextField *text = [[UITextField alloc] initWithFrame:CGRectMake(50, 200, 200, 40)];text.borderStyle = UITextBorderStyleRoundedRect;    NSMutableAttributedString * attributedStr = [[NSMutableAttributedString alloc]initWithString:@"密码"];[attributedStr addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(0, attributedStr.length)];text.attributedPlaceholder = attributedStr;    [self.view addSubview:text];