QT 跨线程传值

控件设计

ChildThread.h

signals:
    void SigSendToUi(int i);

protected:
    void run() override;

Widget.h

private slots:
    void on_updateBtn_clicked();

    void SlotShowInfo(int i);

ChildThread.cpp

void ChildThread::run()
{
    static int clock = 1;

    emit SigSendToUi(clock);

    clock++;
}

Widget.cpp

{

    ChildThread *thread = new ChildThread();
    thread->start();

    connect(thread,&ChildThread::SigSendToUi,this,&Widget::SlotShowInfo);

}

void Widget::SlotShowInfo(int i)
{
    ui->lineEdit->setText(QString::number(i));
}