用QTextBrowser改变QThread

Question

我试图使用QTextBrowser显示一些数据。然而，它冻结了，因为我没有正确地使用线程。我搜索了一些关于堆栈溢出的QThread问题，但不知道为什么我的代码不能工作.

我想打印五次“你好”，每次都有1秒的睡眠。

我还想获得QLineEdit的输入，以设置time.sleep(冷却时间)，但是在解决了Q线程问题之后，我可以这样做。

我搜索并试图实现到我的代码的解决方案是；

PyQt5:在运行时更新标签

PyQt5:更新标签？

可能，我使用了错误的实现方法。但是我是个新手，请帮我

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'denn.ui'
#
# Created by: PyQt5 UI code generator 5.12.3
#
# WARNING! All changes made in this file will be lost!

from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *
from PyQt5 import QtCore, QtGui, QtWidgets
from time import *

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(800, 600)
        MainWindow.setStyleSheet("")
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.verticalLayout = QtWidgets.QVBoxLayout(self.centralwidget)
        self.verticalLayout.setObjectName("verticalLayout")
        self.label = QtWidgets.QLabel(self.centralwidget)
        font = QtGui.QFont()
        font.setFamily("Open Sans")
        font.setPointSize(20)
        self.label.setFont(font)
        self.label.setAlignment(QtCore.Qt.AlignCenter)
        self.label.setObjectName("label")
        self.verticalLayout.addWidget(self.label)
        self.lineEdit = QtWidgets.QLineEdit(self.centralwidget)
        font = QtGui.QFont()
        font.setFamily("Open Sans")
        font.setPointSize(20)
        self.lineEdit.setFont(font)
        self.lineEdit.setAlignment(QtCore.Qt.AlignCenter)
        self.lineEdit.setObjectName("lineEdit")
        self.verticalLayout.addWidget(self.lineEdit)
        self.textBrowser = QtWidgets.QTextBrowser(self.centralwidget)
        font = QtGui.QFont()
        font.setFamily("Open Sans")
        font.setPointSize(20)
        self.textBrowser.setFont(font)
        self.textBrowser.setObjectName("textBrowser")
        self.verticalLayout.addWidget(self.textBrowser)
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        font = QtGui.QFont()
        font.setFamily("Open Sans")
        font.setPointSize(20)
        self.pushButton.setFont(font)
        self.pushButton.setStyleSheet("QPushButton {\n"
"    color: white;\n"
"    border: 2px solid #46963f;\n"
"    border-radius: 20px;\n"
"    border-style: outset;\n"
"    /*background: qradialgradient(\n"
"        cx: 0.3, cy: -0.4, fx: 0.3, fy: -0.4,\n"
"        radius: 1.35, stop: 0 #fff, stop: 1 #46963f\n"
"        );*/\n"
"    background:#46963f;\n"
"    padding: 5px;\n"
"    }\n"
"\n"
"QPushButton:hover {\n"
"    border: 2px solid #07121b;\n"
"    /*background: qradialgradient(\n"
"        cx: 0.3, cy: -0.4, fx: 0.3, fy: -0.4,\n"
"        radius: 1.35, stop: 0 #fff, stop: 1 #1b486d\n"
"        );*/\n"
"    background: #1b486d;\n"
"    }\n"
"\n"
"QPushButton:pressed {\n"
"    border: 2px solid #07121b;\n"
"    border-style: inset;\n"
"    /*background: qradialgradient(\n"
"        cx: 0.4, cy: -0.1, fx: 0.4, fy: -0.1,\n"
"        radius: 1.35, stop: 0 #fff, stop: 1 #1b486d\n"
"        );*/\n"
"    background: #1b486d;\n"
"\n"
"    }")
        self.pushButton.setObjectName("pushButton")
        self.verticalLayout.addWidget(self.pushButton)
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 21))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.label.setText(_translate("MainWindow", "Deneme Programı"))
        self.lineEdit.setPlaceholderText(_translate("MainWindow", "Bekleme Süresi"))
        self.pushButton.setText(_translate("MainWindow", "Başlat"))

        try:
            self.pushButton.clicked.connect(self.x)
        except Exception as e:
            print(e)

    def x(self):
        cd = int(self.lineEdit.text())
        for i in range(5):
            self.thread = DummyThread(self, cd)
            self.thread.start()
            self.thread.finished.connect(self.a)

    def a(self):
        self.textBrowser.setText(self.textBrowser.toPlainText() + "\nHello")

class DummyThread(QThread):
    finished = pyqtSignal()
    def __init__(self,cd):
        super(DummyThread, self).__init__()
        self.cd = cd
    def run(self):
        time.sleep(self.cd)
        self.finished.emit()


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

DummyThread不接受任何参数，在创建实例时删除self。既然是from time import *，就需要从time.sleep(1)中删除time.。这将产生以下代码：

    def x(self):
        self.thread = DummyThread()
        self.thread.start()
        self.thread.finished.connect(self.a)
    def a(self):
        self.textBrowser.setText(self.textBrowser.toPlainText() + "\nHello")

class DummyThread(QThread):
    finished = pyqtSignal()
    def run(self):
        sleep(1)
        self.finished.emit()

附注：正如文件介绍所示，不建议将代码添加到PyUIC生成的文件中。

Answer 2

您的代码之所以失败，是因为它不是从QObject继承的。要使QThreads工作，父类必须继承QObject或派生类，而不是object。

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'denn.ui'
#
# Created by: PyQt5 UI code generator 5.12.3
#
# WARNING! All changes made in this file will be lost!

from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *
from PyQt5 import QtCore, QtGui, QtWidgets
import time


class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(800, 600)
        MainWindow.setStyleSheet("")
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.verticalLayout = QtWidgets.QVBoxLayout(self.centralwidget)
        self.verticalLayout.setObjectName("verticalLayout")
        self.label = QtWidgets.QLabel(self.centralwidget)
        font = QtGui.QFont()
        font.setFamily("Open Sans")
        font.setPointSize(20)
        self.label.setFont(font)
        self.label.setAlignment(QtCore.Qt.AlignCenter)
        self.label.setObjectName("label")
        self.verticalLayout.addWidget(self.label)
        self.lineEdit = QtWidgets.QLineEdit(self.centralwidget)
        font = QtGui.QFont()
        font.setFamily("Open Sans")
        font.setPointSize(20)
        self.lineEdit.setFont(font)
        self.lineEdit.setAlignment(QtCore.Qt.AlignCenter)
        self.lineEdit.setObjectName("lineEdit")
        self.verticalLayout.addWidget(self.lineEdit)
        self.textBrowser = QtWidgets.QTextBrowser(self.centralwidget)
        font = QtGui.QFont()
        font.setFamily("Open Sans")
        font.setPointSize(20)
        self.textBrowser.setFont(font)
        self.textBrowser.setObjectName("textBrowser")
        self.verticalLayout.addWidget(self.textBrowser)
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        font = QtGui.QFont()
        font.setFamily("Open Sans")
        font.setPointSize(20)
        self.pushButton.setFont(font)
        self.pushButton.setStyleSheet("QPushButton {\n"
"    color: white;\n"
"    border: 2px solid #46963f;\n"
"    border-radius: 20px;\n"
"    border-style: outset;\n"
"    /*background: qradialgradient(\n"
"        cx: 0.3, cy: -0.4, fx: 0.3, fy: -0.4,\n"
"        radius: 1.35, stop: 0 #fff, stop: 1 #46963f\n"
"        );*/\n"
"    background:#46963f;\n"
"    padding: 5px;\n"
"    }\n"
"\n"
"QPushButton:hover {\n"
"    border: 2px solid #07121b;\n"
"    /*background: qradialgradient(\n"
"        cx: 0.3, cy: -0.4, fx: 0.3, fy: -0.4,\n"
"        radius: 1.35, stop: 0 #fff, stop: 1 #1b486d\n"
"        );*/\n"
"    background: #1b486d;\n"
"    }\n"
"\n"
"QPushButton:pressed {\n"
"    border: 2px solid #07121b;\n"
"    border-style: inset;\n"
"    /*background: qradialgradient(\n"
"        cx: 0.4, cy: -0.1, fx: 0.4, fy: -0.1,\n"
"        radius: 1.35, stop: 0 #fff, stop: 1 #1b486d\n"
"        );*/\n"
"    background: #1b486d;\n"
"\n"
"    }")
        self.pushButton.setObjectName("pushButton")
        self.verticalLayout.addWidget(self.pushButton)
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 21))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.label.setText(_translate("MainWindow", "Deneme Programı"))
        self.lineEdit.setPlaceholderText(_translate("MainWindow", "Bekleme Süresi"))
        self.pushButton.setText(_translate("MainWindow", "Başlat"))

        

class Window(QtWidgets.QMainWindow):
    def __init__(self, parent=None):
        super(Window, self).__init__(parent)
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)

        self.ui.pushButton.clicked.connect(self.x)
    def x(self):
        cd = int(self.ui.lineEdit.text())
        for i in range(5):
            self.thread = DummyThread(self, cd)
            self.thread.finished.connect(self.a)
            self.thread.start()

    def a(self):
        self.ui.textBrowser.setText(self.ui.textBrowser.toPlainText() + "\nHello")

class DummyThread(QThread):
    finished = pyqtSignal()
    def __init__(self, parent, cd):
        super(DummyThread, self).__init__(parent)
        self.cd = cd

    def run(self):
        time.sleep(self.cd)
        self.finished.emit()


if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    win = Window()
    win.show()
    sys.exit(app.exec_())