mainwindow.h 

#ifndef WORKERTHREAD_H
#define WORKERTHREAD_H#include <QObject>
#include <QThread>
#include <QQueue>
class WorkerThread : public QThread
{Q_OBJECT
public:explicit WorkerThread();
private:void run() override;  //重新实现run（）signals:void sendData(float zhi);};#endif // WORKERTHREAD_H

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workerthread.cpp 

#include <iostream>
#include "workerthread.h"
#include <QTimer>WorkerThread::WorkerThread()
{}void WorkerThread::run()
{std::cout << "Thread started" << std::endl;std::this_thread::sleep_for(std::chrono::seconds(5)); // 延时2秒std::cout << "Thread finished" << std::endl;emit sendData(5.28);
}

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mainwindow.h 

#ifndef MAINWINDOW_H
#define MAINWINDOW_H#include <QMainWindow>QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE
class WorkerThread;
class MainWindow : public QMainWindow
{Q_OBJECTpublic:MainWindow(QWidget *parent = nullptr);~MainWindow();private:Ui::MainWindow *ui;WorkerThread* t;private slots:void receiveData(float zhi);
};
#endif // MAINWINDOW_H

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mainwindow.cpp 

#include "mainwindow.h"
#include "ui_mainwindow.h"#include <QApplication>#include <QThread>
#include <QDebug>
#include <QTimer>#include<workerthread.h>MainWindow::MainWindow(QWidget *parent): QMainWindow(parent), ui(new Ui::MainWindow)
{ui->setupUi(this);t=new WorkerThread;connect(t,&WorkerThread::sendData,this,&MainWindow::receiveData);t->start();//t->wait();  //线程执行完之前,会一直堵塞在这，一般用不上，因为用线程就是为了避免堵塞
}void MainWindow::receiveData(float zhi){qDebug()<<"receive data from thread : "<<zhi;
}
MainWindow::~MainWindow()
{delete ui;
}

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FR:徐海涛(hunklxu)