通过QT制作一个模仿微信主界面的界面（不要求实现具体通信功能）

main.cpp

#include "widget.h"
#include "second.h"

#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.show();

    //实例化第二个界面
    Second s;
    QObject::connect(&w, &Widget::my_jump, &s, &Second::jump_slot);

    return a.exec();
}

second.cpp

#include "second.h"
#include "ui_second.h"

Second::Second(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Second)
{
    ui->setupUi(this);
}

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

//第二个界面自定义的槽函数的实现
void Second::jump_slot()
{
    this->show();
}

void Second::on_sendBtn_clicked()
{
    QString msg = ui->msgEdit->text();
    ui->msgWidget->addItem(msg);
}

widget.cpp

#include "widget.h"
#include "ui_widget.h"

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui-