QTimer不会调用该方法来对绘图进行动画处理

#include <QApplication>
#include <QWidget>
#include <QPainter>
#include <QTimer>

class AnimatedWidget : public QWidget {
    Q_OBJECT

public:
    AnimatedWidget(QWidget *parent = nullptr) : QWidget(parent), angle(0) {
        timer = new QTimer(this);
        connect(timer, &QTimer::timeout, this, QOverload<>::of(&AnimatedWidget::updateAnimation));
        timer->start(30); // 每30毫秒更新一次
    }

protected:
    void paintEvent(QPaintEvent *event) override {
        QPainter painter(this);
        painter.setRenderHint(QPainter::Antialiasing);
        painter.translate(width() / 2, height() / 2);
        painter.rotate(angle);
        painter.drawRect(-50, -50, 100, 100);
    }

private slots:
    void updateAnimation() {
        angle += 1; // 每次增加1度
        update();   // 请求重绘
    }

private:
    QTimer *timer;
    int angle;
};

int main(int argc, char *argv[]) {
    QApplication app(argc, argv);
    AnimatedWidget widget;
    widget.show();
    return app.exec();
}

#include "main.moc"