qt信号槽做一个广播（简单，待优化）

broadcast.h

#ifndef BROADCAST_H
#define BROADCAST_H
#include <QObject>
#include <QMap>

typedef void (*BroadcastBack)();//声明函数指针类型

class Broadcast: public QObject {
    Q_OBJECT
public:
    static Broadcast& getInstance(){
        static Broadcast instance;
        return instance;
    }
    void addListener(QString action,BroadcastBack broadcastBack);
    void sendMessage(QString action);

private:
    Broadcast();
    Broadcast(const Broadcast&){}
    Broadcast& operator==(const Broadcast&){}
    QMap<QString,BroadcastBack> mBackMap;


signals:
    void signalMessage(QString action);
private slots:
    void slotMessage(QString action);
};

#endif // BROADCAST_H

broadcast.cpp

#include "broadcast.h"

Broadcast::Broadcast(){
    connect(this,SIGNAL(signalMessage(QString)),this,SLOT(slotMessage(QString)));
}

void Broadcast::slotMessage(QString action){
    BroadcastBack  broadcastBack= this->mBackMap.find(action).value();
    if(broadcastBack!=NULL){
        broadcastBack();
    }
}

void Broadcast::addListener(QString action,BroadcastBack broadcastBack){
    this->mBackMap.insert(action,broadcastBack);

}

void Broadcast::sendMessage(QString action){
    emit  signalMessage(action);
}

使用：

Broadcast::getInstance().addListener("REFRESH_IOT_HOME_VIEW",[]{

        qDebug("====REFRESH_IOT_HOME_VIEW====");
    });


    Broadcast:: getInstance(). sendMessage("REFRESH_IOT_HOME_VIEW");