Python PyQt5——QThread使用方法与代码实践

import sys
from PyQt5.QtCore import QThread, QObject, pyqtSignal
from PyQt5.QtWidgets import QApplication, QWidget, QPushButton
 
# 定义一个继承自QObject的子类，用于在QThread中实现需要的功能
class WorkerSignals(QObject):
    finished = pyqtSignal(str)
 
class Worker(QRunnable):
    def __init__(self, data):
        super(Worker, self).__init__()
        self.data = data
        self.signals = WorkerSignals()
 
    def run(self):
        # 这里可以执行耗时的任务
        # 这里仅示例打印数据和结束信号
        print('Running on thread: %s' % self.data)
        self.signals.finished.emit('Worker finished')
 
class MainWindow(QWidget):
    def __init__(self):
        super().__init__()
        self.button = QPushButton('Start', self)
        self.button.clicked.connect(self.on_start)
 
    def on_start(self):
        worker = Worker('test')
        worker.signals.finished.connect(self.on_finished)
        thread = QThread(self)
        worker.moveToThread(thread)
        thread.started.connect(worker.run)
        thread.finished.connect(self.on_thread_finished)
        thread.start()
 
    def on_finished(self, s):
        print(s)
 
    def on_thread_finished(self):
        print('Thread finished')
 
if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = MainWindow()
    window.show()
    sys.exit(app.exec_())

这段代码定义了一个QThread的使用方法，在MainWindow的on\_start方法中创建了一个Worker对象，并将其放到一个新的QThread中执行。Worker的run方法被连接到了QThread的started信号，以便在新线程中执行。当run方法结束后，QThread的finished信号会被触发，并调用on\_thread\_finished方法。这个例子展示了如何在PyQt5中使用QThread来执行后台任务，并在任务完成时更新UI。