Python线程-不能设置父线程，新父线程在另一个线程中

Question

我想做一个GUI，一旦你按下一个按钮，一个滚动区会动态更新。我尝试使用QThread不锁定GUI，并向用户显示scrollArea，因为它被元素填充。我创建了一个线程工作者类，其中在循环中我正在为scrollArea创建元素。元素放在QVBoxLayout上，我试图使用QObject类型的信号将该布局传递给我的GUI scrollArea。我收到这个错误:QObject::setParent: Cannot set parent, new parent is in a different thread我不知道该怎么解决这个问题

from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
class WorkerThread(QThread):

my_signal = pyqtSignal(QObject)
def run(self):
top_layout = QtWidgets.QVBoxLayout()
for i in range(2500):
group_box = QtWidgets.QGroupBox()
group_box.setTitle('box {0}'.format(i))
label = QtWidgets.QLabel()
label.setText('label {0}'.format(i))
layout = QtWidgets.QHBoxLayout(group_box)
layout.addWidget(label)
top_layout.addWidget(group_box)
self.my_signal.emit(top_layout)
class Ui_MainWindow(object):
def setupUi(self, MainWindow):
MainWindow.setObjectName("MainWindow")
MainWindow.resize(640, 480)
self.centralwidget = QtWidgets.QWidget(MainWindow)
self.centralwidget.setObjectName("centralwidget")
self.pushButton = QtWidgets.QPushButton(self.centralwidget)
self.pushButton.setGeometry(QtCore.QRect(520, 30, 71, 51))
self.pushButton.setObjectName("pushButton")
self.scrollArea = QtWidgets.QScrollArea(self.centralwidget)
self.scrollArea.setGeometry(QtCore.QRect(0, 90, 511, 461))
self.scrollArea.setWidgetResizable(True)
self.scrollArea.setObjectName("scrollArea")
self.scrollAreaWidgetContents = QtWidgets.QWidget()
self.scrollAreaWidgetContents.setGeometry(QtCore.QRect(0, 0, 505, 455))
self.scrollAreaWidgetContents.setObjectName("scrollAreaWidgetContents")
self.scrollArea.setWidget(self.scrollAreaWidgetContents)
MainWindow.setCentralWidget(self.centralwidget)  
self.pushButton.clicked.connect(self.click)
self.retranslateUi(MainWindow)
QtCore.QMetaObject.connectSlotsByName(MainWindow)
def retranslateUi(self, MainWindow):
_translate = QtCore.QCoreApplication.translate
MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
self.pushButton.setText(_translate("MainWindow", "add"))


def click(self):
self.worker = WorkerThread()
self.worker.start()
self.worker.my_signal.connect(self.update_scrollArea)

def update_scrollArea(self, top_layout):
top_widget = QtWidgets.QWidget()
top_widget.setLayout(top_layout)
self.scrollArea.setWidget(top_widget)


if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
MainWindow = QtWidgets.QMainWindow()
ui = Ui_MainWindow()
ui.setupUi(MainWindow)
MainWindow.show()
sys.exit(app.exec_())

Answer 1

我过去在线程中创建PyQt5对象时遇到过问题，您可以选择使用计时器来代替。

class Ui_MainWindow(object):
def __init__(self):
self.timer = QtCore.QBasicTimer()
self.timer.start(250, self)
self.i = 0

def timerEvent(self, event):
if self.i < 2500:
self.i+=1
top_layout = QtWidgets.QVBoxLayout()
group_box = QtWidgets.QGroupBox()
group_box.setTitle('box {0}'.format(i))
label = QtWidgets.QLabel()
label.setText('label {0}'.format(i))
layout = QtWidgets.QHBoxLayout(group_box)
layout.addWidget(label)
top_layout.addWidget(group_box)
self.my_signal.emit(top_layout)

def setupUi(self, MainWindow):
...

这样，你将每隔250毫秒中断一次主循环，一次更新一个循环迭代，并且你不会冻结GUI。