[TOC] ## 概述 1. 繼承 QThread 類重寫了 run() 函數 2. 執行完成后發出一個完成信號 3. connect 處理 QThread::finished() 信號觸發 QThread::deleteLater() ``` connect(thread, &WorkerThread::finished, thread, &WorkerThread::deleteLater); ``` 4. 通過從run()函數直接或者間接地調用 QThread::exec(),可以讓線程進入事件循環 ``` while (true) { //...code exec(); } ``` ## 示例 ``` class WorkerThread : public QThread { Q_OBJECT public: WorkerThread(QObject *parent = 0) : QThread(parent) { } protected: void run() { for (int i = 0; i < 1000000000; i++); emit done(); } signals: void done(); }; // main.cpp ... // 在GUI 中顯示計時器 QTimer *timer = new QTimer(this); connect(timer, &QTimer::timeout, [=]() { static int sec = 0; lcdNumber->display(QString::number(sec++)); }); WorkerThread *thread = new WorkerThread(this); // 子線程處理完發出信號 connect(thread, &WorkerThread::done, timer, &QTimer::stop); // 子線程完成后,刪除子線程 connect(thread, &WorkerThread::finished, thread, &WorkerThread::deleteLater); // 點擊事件觸發信號 connect(button, &QPushButton::clicked, [=]() { timer->start(1); thread->start(); }); ```