直接从Qthread PyQt 5更改图形用户界面

from PyQt5.QtCore import QThread, pyqtSignal
from PyQt5.QtWidgets import QApplication, QMainWindow, QLabel

class WorkerThread(QThread):
    finished = pyqtSignal()  # 定义一个信号

    def run(self):
        # 后台任务逻辑
        # ...

        self.finished.emit()  # 发送信号，表示任务完成

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()

        self.label = QLabel("Hello World", self)
        self.label.setGeometry(50, 50, 200, 30)

        self.worker_thread = WorkerThread()
        self.worker_thread.finished.connect(self.update_ui)  # 连接信号与槽

        self.worker_thread.start()  # 启动后台任务

    def update_ui(self):
        self.label.setText("Task Finished")  # 更新界面

if __name__ == "__main__":
    app = QApplication([])
    window = MainWindow()
    window.show()
    app.exec_()