qt5 中登录界面

    //设置密码的模式
    ui->pwdLineEdit->setEchoMode(QLineEdit::Password);
    //让字符出现在LineEdit中
    ui->pwdLineEdit->setPlaceholderText(tr("请输入用户名"));
    ui->usrLineEdit->setPlaceholderText(tr("请输入密码"));

        ui->usrLineEdit->clear();
        ui->pwdLineEdit->clear();
        //光标自动进入usrlineedit中
        ui->usrLineEdit->setFocus();