qt QLineEdit 账号密码框的设置_qlineedit::password

设置占位符

ui->lineEdit->setPalaceholderText("QQ号/手机/邮箱");

设置输入为黑点

 ui->lineEdit_2->setEchoMode(QLineEdit::Password);

默认为：

QLineEdit::Normal    0    Display characters as they are entered. This is the default.

不要显示任何东西。这可能适用于密码长度都应该保密的密码。

QLineEdit::NoEcho    1    Do not display anything. This may be appropriate for passwords where even the length of the password should be kept secret.

显示与平台相关的密码掩码字符，而不是实际输入的字符。

QLineEdit::Password    2    Display platform-dependent password mask characters instead of the characters actually entered.

在编辑时按输入显示字符，否则按密码显示字符。

QLineEdit::PasswordEchoOnEdit    3    Display characters as they are entered while editing otherwise display characters as with Password.