如何从另一个线程- PyQt向gui发送标签？

import sys
import time
from PyQt5.QtCore import Qt, QObject, pyqtSignal, pyqtSlot
from PyQt5.QtWidgets import QApplication, QLabel, QVBoxLayout, QWidget
from PyQt5.QtGui import QFont


class Worker(QObject):
    finished = pyqtSignal()
    label_updated = pyqtSignal(str)

    @pyqtSlot()
    def do_work(self):
        # 模拟耗时操作
        time.sleep(2)

        # 发送信号更新标签文本
        self.label_updated.emit("Hello from another thread!")

        # 发送信号通知工作完成
        self.finished.emit()


class GUI(QWidget):
    def __init__(self):
        super().__init__()

        self.init_ui()

    def init_ui(self):
        self.setWindowTitle("Thread Communication Example")
        self.setGeometry(300, 300, 300, 200)

        self.label = QLabel("Waiting for update...", self)
        self.label.setAlignment(Qt.AlignCenter)
        self.label.setFont(QFont("Arial", 12))

        layout = QVBoxLayout()
        layout.addWidget(self.label)

        self.setLayout(layout)

    @pyqtSlot(str)
    def update_label(self, text):
        self.label.setText(text)


if __name__ == '__main__':
    app = QApplication(sys.argv)

    worker = Worker()
    gui = GUI()

    # 连接信号与槽
    worker.label_updated.connect(gui.update_label)
    worker.finished.connect(app.quit)

    # 启动工作线程
    worker_thread = QThread()
    worker.moveToThread(worker_thread)
    worker_thread.started.connect(worker.do_work)
    worker_thread.start()

    gui.show()

    sys.exit(app.exec_())