QT 1.11

.cpp

#include "widget.h"
#include "ui_widget.h"
#include 
Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);

    ui->lineEdit->setPlaceholderText("请输入用户名");
    ui->lineEdit_2->setPlaceholderText("请输入密码");
    ui->lineEdit_2->setEchoMode(QLineEdit::Password );
    ui->radioButton_2->setChecked(true);

    connect(ui->radioButton,SIGNAL(clicked()),this,SLOT(radiobuttun_clicked()));
    connect(ui->radioButton_2,SIGNAL(clicked()),this,SLOT(radiobuttun_clicked()));
    connect(ui->pushButton,SIGNAL(clicked()),this,SLOT(pushbuttun_clicked()));
    connect(ui->lineEdit_2,SIGNAL(editingFinished()),this,SLOT(pushbuttun_clicked()));
}

Widget::~Widget()
{
    delete ui;
}

void Widget::radiobuttun_clicked()
{
    if(ui->radioButton->isChecked()){
        ui->pushButton->setText("注册");
    }

    if(ui->radioButton_2->isChecked()){
        ui->pushButton->setText("登录");
    }
}

void Widget::pushbuttun_clicked()
{
    qDebug()<<"用户名: "<lineEdit->text();
    qDebug()<<"密码: "<lineEdit_2->text();
    qDebug()<<"单选框状态:";
    if(ui->radioButton->isChecked()){
        qDebug()<<"注册";
    }

    if(ui->radioButton_2->isChecked()){
        qDebug()<<"登录";
    }
    qDebug()<<"复选框状态:";
    if(ui->checkBox->isChecked()){
        qDebug()<<"选中记住密码";
    }
    else{
        qDebug()<<"未选中";
    }
}

.h

#ifndef WIDGET_H
#define WIDGET_H

#include 

QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACE

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = nullptr);
    ~Widget();
public slots:
    void radiobuttun_clicked();
    void pushbuttun_clicked();

private:
    Ui::Widget *ui;
};
#endif // WIDGET_H