條件：

①2個類直接沒有任何關係；

②接收訊息的類必須有一個全域性變數；

③ QMetaObject::invokeMethod((QObject*)全域性變數類, "接收的方法", Qt::AutoConnection, Q_ARG(接收的引數型別, 接收的引數));

class ViewManagerA : public QMainWindow

{

    Q_OBJECT   

public:

    ViewManagerA(QWidget *parent = 0);

    ~ViewManagerA();

private slots:

    //介面點選事件處理
 

    void receiveMsg(QString msg);

}

ViewManager *g_viewManagerA;

extern ViewManager *g_viewManagerA;

class ViewManagerB : public QObject

{

    Q_OBJECT   

public:

    ViewManagerB(QWidget *parent = 0);

    ~ViewManagerB();

 private:
    void sendMsg();

}

void ViewManagerB::sendMsg()

{

   QMetaObject::invokeMethod((QObject*)g_viewManagerA, "receiveMsg", Qt::AutoConnection, Q_ARG(QString, "測試"));

}