等待QThread时UI会阻塞/如何正确使用QThread

// 自定义线程类
class MyThread : public QThread {
    Q_OBJECT
public:
    MyThread(QObject *parent = nullptr) : QThread(parent) {}

protected:
    void run() override {
        // 耗时操作
        emit finished();
    }

signals:
    void finished();
};

// 主线程代码
int main(int argc, char *argv[]) {
    QApplication app(argc, argv);

    QWidget window;
    QPushButton button("Start Thread");
    QVBoxLayout layout(&window);
    layout.addWidget(&button);

    MyThread thread;

    QObject::connect(&button, &QPushButton::clicked, [&thread]() {
        thread.start();
    });

    QObject::connect(&thread, &MyThread::finished, &app, &QApplication::quit);

    window.show();
    return app.exec();
}

// 自定义任务类
class MyRunnable : public QRunnable {
public:
    void run() override {
        // 耗时操作
    }
};

// 主线程代码
int main(int argc, char *argv[]) {
    QApplication app(argc, argv);

    QWidget window;
    QPushButton button("Start Task");
    QVBoxLayout layout(&window);
    layout.addWidget(&button);

    QThreadPool pool;
    pool.setMaxThreadCount(10);

    QObject::connect(&button, &QPushButton::clicked, [&pool]() {
        MyRunnable *task = new MyRunnable;
        pool.start(task);
    });

    window.show();
    return app.exec();
}