概述

使用 QObject::moveToThread() 方法，可以把一个继承自 QObject 的对象交给一个 QThread 对象，然后再调用 QThread 的 start() 函数使其全权处理事件循环，当我们需要让子线程执行某个任务，只需要发出对应的信号就可以。
而继承 QThread 实现多线程方法，只能执行 run() 函数中的任务。使用 moveToThread 可以定义多个槽函数，用相应的信号触发即可。

代码示例

①．定义一个继承自 QObject 的对象

class WorkObject : public QObject
{
  Q_OBJECT
public:
  WorkObject(QObject *parent = nullptr);
  ~WorkObject();
signals:
  void workStart();//工作开始
  void workFinished();//工作完成
private:
  void doWork();
public slots:
  void starWork();//开始工作
};


WorkObject::WorkObject(QObject *parent)
  : QObject(parent)
{
}

WorkObject::~WorkObject()
{
  qDebug() << "WorkObject 销毁" << endl;
}

void WorkObject::doWork()
{
  for (int i = 0; i < 1000; ++i)
  {
    qDebug() << i << endl;
  }
  emit workFinished();
}

void WorkObject::starWork()
{
  emit workStart();
  doWork();
}

②．使用 moveToThread 转移线程

WorkObject * workObject = new WorkObject();//工作对象
QThread * workThread = new QThread();//工作线程
//转移线程
workObject->moveToThread(workThread);
//开始工作
QObject::connect(workThread, &QThread::started, workObject, &WorkObject::starWork);
//工作对象工作结束，停止线程
QObject::connect(workObject, &WorkObject::workFinished, workThread, [&]() {
   workThread->quit();
    workThread->wait();
});
//工作线程停止，销毁工作对象
QObject::connect(workThread, &QThread::finished, workObject, &WorkObject::deleteLater);
//工作对象销毁，销毁工作线程
QObject::connect(workObject, &WorkObject::destroyed, workThread, &QThread::deleteLater);
//线程销毁
QObject::connect(workThread, &QThread::destroyed, [&]() {
    qDebug() << "workThread 销毁" << endl;
 });
//启动线程
 workThread->start();

代码运行结果如下：