_psdTextField.attributedPlaceholder = [[NSAttributedString alloc] initWithString:NSLocalizedString(@"密码", nil) attributes:@{NSFontAttributeName:_psdTextField.font,NSForegroundColorAttributeName:[UIColor whiteColor]}];iOS：自定义UITextField的Placeholder提示字格式
原文：http://blog.csdn.net/u013243469/article/details/45559123