UITextField *text = [[UITextField alloc] initWithFrame:CGRectMake(, , , )];

text.borderStyle = UITextBorderStyleRoundedRect;

NSMutableAttributedString * attributedStr = [[NSMutableAttributedString alloc]initWithString:@"密码"];

[attributedStr addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(, attributedStr.length)];

text.attributedPlaceholder = attributedStr;

[self.view addSubview:text];