芜湖不芜
这个问题是由一个非常普遍和错误的概念引起的，他们认为 QThread 是一个Qt Thread，即Qt创建的新线程，但不，QThread是文档中指出的线程处理程序：QThread 类提供了一种与平台无关的方法来管理线程。QThread 对象管理程序中的一个控制线程。QThreads 在 run() 中开始执行。默认情况下，run() 通过调用 exec() 启动事件循环，并在线程内运行 Qt 事件循环。在另一个线程上运行的唯一部分是 run 方法，在您的情况下，您没有调用，因为您的逻辑不同，您不想连续执行繁重的任务，但应用户的要求，因此设计必须是worker 但您使用 QThread 作为基类，这是不正确的，您必须使用 QObject 作为基类并将其移动到新线程，以便 QObject 在该线程中执行其任务，防止 GUI 阻塞。一个 QObject 不是线程安全的，它存在于一个线程中，它所在的线程由以下决定：AQObject住在父线程中如果您没有父级，请留在创建它的线程中，除非您已移动到另一个线程。并且您可以使用该moveToThread()函数移动到另一个线程，但是moveToThread()如果它QObject有父级，因为第一个条件是特权的，则会失败。另一方面，如果您想从另一个线程调用一个方法，则有必要使用装饰器 @QtCore.pyqtSlot()综上所述，我们得到以下解决方案：#!/usr/bin/env python3import sysimport timefrom PyQt5 import QtCore, QtWidgetsclass ConfWorker(QtCore.QObject): updated_button = QtCore.pyqtSignal(list) updated_label = QtCore.pyqtSignal(str) updated_error = QtCore.pyqtSignal(str) request_signal = QtCore.pyqtSignal() customer = QtCore.pyqtSignal(str) def __init__(self, parent=None): super(ConfWorker, self).__init__(parent) self.customer.connect(self.getcustomer) @QtCore.pyqtSlot() def doWork(self): self.request_signal.emit() @QtCore.pyqtSlot(str) def getcustomer(self, text): self.configure(text) def configure(self, customer_name): self.updated_button.emit(["In progress...", False]) self.updated_label.emit(customer_name) time.sleep(5) # During this time you should be able to see color change etc. #myaction.myaction(customer_name)# TAKES ~20 SECONDS TO FINISH self.updated_button.emit(["Start", True])class ConfGUI(QtWidgets.QWidget): def __init__(self, parent=None): super(ConfGUI, self).__init__() # create a QThread and start the thread that handles thread = QtCore.QThread(self) thread.start() # create the worker without a parent so you can move self.worker = ConfWorker() # the worker moves to another thread self.worker.moveToThread(thread) self.worker.updated_button.connect(self.updateButton) self.worker.updated_label.connect(self.updateLabel) self.worker.updated_error.connect(self.updateError) self.worker.request_signal.connect(self.sendCustomer) self.targetBtn = QtWidgets.QPushButton('Start Configuration', self) self.targetBtn.setStyleSheet("QPushButton { background-color: green; color: white }" "QPushButton:disabled { background-color: red; color: white }") self.targetBtn.clicked.connect(self.worker.doWork) self.targetBtn.setFixedSize(200, 50) self.customerlist = QtWidgets.QComboBox(self) self.customerlist.addItems(["testcustomer1", "testcustomer2", "testcustomer3"]) self.customerlist.setFixedSize(200, 50) self.label = QtWidgets.QLabel(self, alignment=QtCore.Qt.AlignCenter) self.label.setStyleSheet('font-size: 30pt; font-family: Courier; color: green;') self.label.setFixedSize(400,50) self.error_label = QtWidgets.QLabel(self, alignment=QtCore.Qt.AlignCenter) self.error_label.setStyleSheet('font-size: 30pt; font-family: Courier; color: red;') self.error_label.setFixedSize(400,50) lay = QtWidgets.QVBoxLayout(self) lay.addWidget(self.customerlist, alignment=QtCore.Qt.AlignCenter) lay.addWidget(self.label, alignment=QtCore.Qt.AlignCenter) lay.addWidget(self.error_label, alignment=QtCore.Qt.AlignCenter) lay.addWidget(self.targetBtn, alignment=QtCore.Qt.AlignCenter) self.setFixedSize(400, 550) @QtCore.pyqtSlot() def sendCustomer(self): self.worker.customer.emit(self.customerlist.currentText()) @QtCore.pyqtSlot(list) def updateButton(self, button_list): self.targetBtn.setText(button_list[0]) self.targetBtn.setEnabled(button_list[1]) @QtCore.pyqtSlot(str) def updateLabel(self, label_text): self.label.setText(label_text) @QtCore.pyqtSlot(str) def updateError(self, error_text): self.error_label.setText(error_text)if __name__ == '__main__': app = QtWidgets.QApplication(sys.argv) ex = ConfGUI() ex.show() sys.exit(app.exec_())观察：另外，正如您在我的解决方案中看到的那样，QThread将是窗口的子级，因为QThread是QObject处理另一个线程。
FFIVE
你真的写了很困难很简单的事情。尝试一下：import sysfrom PyQt5.QtWidgets import QWidget, QApplication, QPushButton, QComboBox, QLabelfrom PyQt5.QtCore import QThread, pyqtSignalclass ConfWorker(QThread): threadSignal = pyqtSignal(str) finishSignal = pyqtSignal(str) def __init__(self, startParm): super().__init__() self.startParm = startParm # Initialize the parameters passed to the task def run(self): # Do something... for i in range(20): text = "In progress ................." \ if i%2==0 else "In progress {}".format(self.startParm) self.threadSignal.emit(text) QThread.msleep(500) self.finishSignal.emit(self.startParm)class ConfGUI(QWidget): def __init__(self): super().__init__() self.setGeometry(800, 100, 400, 550) self.setFixedSize(400, 550) self.targetBtn = QPushButton('Start Configuration', self) self.targetBtn.setStyleSheet( "QPushButton { background-color: green; color: white;}" "QPushButton:disabled { background-color: red; color: white;}" ) self.targetBtn.setGeometry(100, 400, 200, 50) self.targetBtn.clicked.connect(self.workerStart) self.customerlist = QComboBox(self) self.customerlist.setGeometry(100, 50, 200, 50) self.customerlist.setObjectName("customer") self.customerlist.addItem("testcustomer1") self.customerlist.addItem("testcustomer2") self.customerlist.addItem("testcustomer3") self.customerlist.activated[str].connect(self.comboActivated) self.startParm = "testcustomer1" self.label = QLabel(self) self.label.setStyleSheet('font-size: 30pt; font-family: Courier; color: green;') self.label.setGeometry(70,250,400,50) def workerStart(self): self.targetBtn.setText("In progress...") self.targetBtn.setEnabled(False) self.label.setText("") self.worker = ConfWorker(self.startParm) self.worker.threadSignal.connect(self.on_threadSignal) self.worker.finishSignal.connect(self.on_finishSignal) self.worker.start() def on_threadSignal(self, text): self.targetBtn.setText(text) def on_finishSignal(self, text): self.targetBtn.setEnabled(True) self.targetBtn.setText("Start Configuration'") self.label.setText(text) def comboActivated(self, text): self.startParm = textif __name__ == '__main__': app = QApplication(sys.argv) ex = ConfGUI() ex.show() sys.exit(app.exec_())