在做一些东西的时候，习惯性的引入头文件并且调用，因此出现了很多bug,qt的信号槽机制便可以有效的避免一些问题。
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();
}
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。