Qt中线程间使用信号槽，槽函数不响应的问题

class myThread:public QThread
{
signals:
    void updateSig(MyData);
}
void myThread::run()
{
    emit updateSig(MyData);
}
 
class MainWid:public MainWindow
{
myThread *thread;
public slots:
    void updateSlot(MyData);
}
MainWid:MainWid()
{
    thread=new myThread;
    qRegisterMetaType<MyData>("MyData");//自定义数据类型需要进行注册
    connect(thread,SIGNAL(updateSig(MyData)),this,SLOT(updateSlot(MyData)));
}