QT-信号与槽-两个类之间使用信号与槽

A类：

#ifndef A_H
#define A_H

#include <QObject>
#include <QDebug>
class A : public QObject
{
          
   
    Q_OBJECT
public:
    explicit A(QObject *parent = nullptr);

signals:
   void Asignal(void);
public slots:
   void Aslot(void){
          
   
       qDebug()<<"A类的槽函数被调用";

   }

};

#endif // A_H

B类：

#ifndef B_H
#define B_H

#include <QObject>
#include <QDebug>
class B : public QObject
{
          
   
    Q_OBJECT
public:
    explicit B(QObject *parent = nullptr);

signals:
   void Bsignal(void);
public slots:
   void Bslot(void){
          
   
       qDebug()<<"B类的槽函数被调用";

   }

};


#endif // B_H

mainwindow：

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "a.h"
#include "b.h"
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
          
   
    ui->setupUi(this);

}

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

void MainWindow::on_pushButton_2_clicked()
{
          
   
    qDebug()<<"PushButton(A>B)";
    A *a = new A;
    B *b = new B;
    connect(a,SIGNAL(Asignal()),b,SLOT(Bslot()));
    emit a->Asignal();

}
void MainWindow::on_pushButton_clicked()
{
          
   
    qDebug()<<"PushButton(B>A)";
    B *b = new B;
    A *a = new A;
    connect(b,SIGNAL(Bsignal()),a,SLOT(Aslot()));
    emit b->Bsignal();


}

效果： 当点击PushButton(A>B)时，A类发送信号，调用B类的槽函数；

当点击PushButton(B>A)时，B类发送信号，调用A类的槽函数。