如何更新UI_MainWindow中的PYQT5进度栏

Question

我尝试使用PYQT5实时进行进度栏更新，但是，目前在线文档似乎非常有限。我在线阅读，可以使用线程和信号来做到这一点。但是，语法似乎在pyqt5中发生了变化。这里的任何专家可以提供帮助吗？

主UI窗口。

# -*- coding: utf-8 -*-
#
# Created by: PyQt5 UI code generator 5.9
#
# WARNING! All changes made in this file will be lost!
from PyQt5 import QtCore, QtGui, QtWidgets
from sendInvoice import *
class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(441, 175)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.progressBar = QtWidgets.QProgressBar(self.centralwidget)
        self.progressBar.setGeometry(QtCore.QRect(30, 20, 411, 61))
        self.progressBar.setProperty("value", 0)
        self.progressBar.setObjectName("progressBar")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(160, 100, 75, 23))
        self.pushButton.setObjectName("pushButton")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 441, 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)
        self.pushButton.clicked.connect(self.sendInvoice)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)
    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.pushButton.setText(_translate("MainWindow", "Send"))
    def sendInvoice(self):
        sendInvoice.sendInv()
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_())

发票发送的位置。

import requests
import json
import sys
from PyQt5.QtWidgets import (QWidget, QProgressBar, QPushButton, QApplication)


class sendInvoice():
    def sendInv(self):
        startInvNum = int(100)
        endInvNum = int(102)
        Username = 'test'
        Password = 'test'
        AccountNum = test
        environmentURL = 'http://www.test.com/api?INV' ##remove this temporary
        totalRequest = int(endInvNum) - int(startInvNum)

        n = 1
        headerData = {
                     'Authorization': 'auth_email=' + Username + ', auth_signature=' + Password + ', auth_account=' + AccountNum,
                     'content-type': 'application/json',
        }
        QApplication.processEvents()

        for i in range(startInvNum, endInvNum+1):
            result = requests.get(environmentURL + str(i), headers=headerData)
            print (result.text)
            jsonOutput = json.loads(result.text)
            print (json.dumps(jsonOutput, sort_keys=True, indent=4))
            self.currentCount = str(n)
            self.total = str(totalRequest)
            percentage = sendInvoice.getPercentage(self)
            print (percentage)
            QApplication.processEvents()
            n += 1
    def getPercentage(self):
        count = int(self.currentCount)
        total = int(self.total)
        currentPercentage = (count / (total + 1) * 100)
        print(currentPercentage * 100)
        return currentPercentage

Answer 1

不建议修改设计文件，适合创建另一个文件以将逻辑加入设计。因此，我将假设设计文件称为ui_mainwindow.py(您必须删除所有更改(

.
├── main.py
├── sendInvoice.py
└── ui_mainwindow.py

您的代码有点混乱，所以我会自由来改进它，在这种情况下，我不会使用qthread，而是使用qrunnnable的qthreadpool，并发送信息，我将使用qmetaObject：

使用QThreadPool和QRunnable

sendinvoice.py

from PyQt5 import QtCore
import requests
import json
class InvoiceRunnable(QtCore.QRunnable):
    def __init__(self, progressbar):
        QtCore.QRunnable.__init__(self)
        self.progressbar = progressbar
    def run(self):
        startInvNum = 100
        endInvNum = 102
        Username = 'test'
        Password = 'test'
        AccountNum = 'test'
        environmentURL = 'http://www.test.com/api?INV' ##remove this temporary

        headerData = { 
            'Authorization': 'auth_email={}, auth_signature={}, auth_account={}'.format(Username, Password, AccountNum),
            'content-type': 'application/json',
        }
        totalRequest = endInvNum - startInvNum + 1 
        for n, i in enumerate(range(startInvNum, endInvNum+1)):
            result = requests.get(environmentURL + str(i), headers=headerData)
            print (result.text)
            jsonOutput = json.loads(result.text)
            print(json.dumps(jsonOutput, sort_keys=True, indent=4))
            print(n+1, totalRequest)
            currentPercentage = (n+1)*100/totalRequest
            QtCore.QMetaObject.invokeMethod(self.progressbar, "setValue",
                                 QtCore.Qt.QueuedConnection,
                                 QtCore.Q_ARG(int, currentPercentage))

我们将加入Main.py的两个部分。

main.py

from PyQt5 import QtCore, QtGui, QtWidgets
from ui_mainwindow import Ui_MainWindow
from sendInvoice import InvoiceRunnable
class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
    def __init__(self, *args, **kwargs):
        QtWidgets.QMainWindow.__init__(self, *args, **kwargs)
        self.setupUi(self)
        self.progressBar.setRange(0, 100)
        self.pushButton.clicked.connect(self.sendInvoice)
    def sendInvoice(self):
        runnable = InvoiceRunnable(self.progressBar)
        QtCore.QThreadPool.globalInstance().start(runnable)

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

使用QThread

sendinvoice.py

from PyQt5 import QtCore
import requests
import json
class InvoiceThread(QtCore.QThread):
    percentageChanged = QtCore.pyqtSignal(int)
    def run(self):
        startInvNum = 100
        endInvNum = 102
        Username = 'test'
        Password = 'test'
        AccountNum = 'test'
        environmentURL = 'http://www.test.com/api?INV' ##remove this temporary

        headerData = { 
            'Authorization': 'auth_email={}, auth_signature={}, auth_account={}'.format(Username, Password, AccountNum),
            'content-type': 'application/json',
        }
        totalRequest = endInvNum - startInvNum + 1 
        for n, i in enumerate(range(startInvNum, endInvNum+1)):
            result = requests.get(environmentURL + str(i), headers=headerData)
            print (result.text)
            jsonOutput = json.loads(result.text)
            print(json.dumps(jsonOutput, sort_keys=True, indent=4))
            print(n+1, totalRequest)
            currentPercentage = (n+1)*100/totalRequest
            self.percentageChanged.emit(currentPercentage)

main.py

from PyQt5 import QtCore, QtGui, QtWidgets
from ui_mainwindow import Ui_MainWindow
from sendInvoice import InvoiceThread
class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
    def __init__(self, *args, **kwargs):
        QtWidgets.QMainWindow.__init__(self, *args, **kwargs)
        self.setupUi(self)
        self.progressBar.setRange(0, 100)
        self.pushButton.clicked.connect(self.sendInvoice)
    def sendInvoice(self):
        thread = InvoiceThread(self)
        thread.percentageChanged.connect(self.progressBar.setValue)
        thread.start()

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