Python 3.5，单独窗口中的 pyqt5 进度条 gui

Question

我是 PyQt5 的新手，对 Python 还是很陌生。我正在尝试在 Python 3.5 中使用 PyQt5 创建一个图形用户界面，在其中单击一个按钮以启动一个单独的窗口，其中进度条迭代到 100，然后在迭代结束时关闭窗口以生成一条消息“它工作”。

问题是进度条已创建但没有更新，并且在到达结束后它不显示它工作的消息。当我尝试调试时，它完全崩溃，没有任何警告说明原因。不知道怎么调试代码

我的进度条码如下图：

from PyQt5 import QtCore, QtWidgets
import sys

class Ui_Form(object):
def setupUi(self, Form):
    Form.setObjectName("Form")
    Form.resize(1075, 84)
    self.progressBar = QtWidgets.QProgressBar(Form)
    self.progressBar.setGeometry(QtCore.QRect(30, 30, 1000, 35))
    sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Fixed, QtWidgets.QSizePolicy.Fixed)
    sizePolicy.setHorizontalStretch(0)
    sizePolicy.setVerticalStretch(0)
    sizePolicy.setHeightForWidth(self.progressBar.sizePolicy().hasHeightForWidth())
    self.progressBar.setSizePolicy(sizePolicy)
    self.progressBar.setMinimumSize(QtCore.QSize(1000, 35))
    self.progressBar.setMaximumSize(QtCore.QSize(1000, 35))
    self.progressBar.setProperty("value", 0)
    self.progressBar.setObjectName("progressBar")

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

def setValue(self, val):
    self.progressBar.setProperty("value", val)

def retranslateUi(self, Form):
    _translate = QtCore.QCoreApplication.translate
    Form.setWindowTitle(_translate("Form", "Progress bar"))

下面给出主程序

from PyQt5.QtWidgets import QApplication, QDialog, QWidget, QPushButton, QMessageBox
import ProgressBar
import sys

class App(QWidget):
def __init__(self):
    super().__init__()
    self.title = 'PyQt5 button - pythonspot.com'
    self.left = 200
    self.top = 200
    self.width = 320
    self.height = 200
    self.initUI()

def initUI(self):
    self.setWindowTitle(self.title)
    self.setGeometry(self.left, self.top, self.width, self.height)

    button = QPushButton('PyQt5 button', self)
    button.setToolTip('This is an example button')
    button.move(100, 70)
    button.clicked.connect(self.on_click)

    self.show()

def on_click(self):
    print('PyQt5 button click')

    app1 = QApplication(sys.argv)
    window = QDialog()
    ui = ProgressBar.Ui_Form()
    ui.setupUi(window)
    window.show()

    for i in range(0, 100):
        ui.setValue(((i + 1) / 100) * 100)

    app1.quit()

    QMessageBox.information(self, "Message", "Data Loaded")

if __name__ == '__main__':
app = QApplication(sys.argv)
ex = App()
sys.exit(app.exec_())

任何帮助将不胜感激。

Answer 1

这是我的最终代码。我试图在使用 pyqt 设计器时包含一些好的做法，而不是直接编辑创建的文件，而是从另一个文件运行它并调用它。当我想按照建议进行更改时，这使事情变得更加容易。我还在代码中加入了 time.sleep(0.1) 来减慢它的速度，这样你就可以看到它正在工作。希望对您有所帮助。

ProgressBar_ui.py - 由 ProgressBar.ui 在 python 中转换生成的文件

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

# Form implementation generated from reading ui file 'Base.ui'
#
# Created by: PyQt5 UI code generator 5.6
#
# WARNING! All changes made in this file will be lost!

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_Form(object):
    def setupUi(self, Form):
    Form.setObjectName("Form")
    Form.resize(1075, 84)
    self.progressBar = QtWidgets.QProgressBar(Form)
    self.progressBar.setGeometry(QtCore.QRect(30, 30, 1000, 35))
    sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Fixed, QtWidgets.QSizePolicy.Fixed)
    sizePolicy.setHorizontalStretch(0)
    sizePolicy.setVerticalStretch(0)
    sizePolicy.setHeightForWidth(self.progressBar.sizePolicy().hasHeightForWidth())
    self.progressBar.setSizePolicy(sizePolicy)
    self.progressBar.setMinimumSize(QtCore.QSize(1000, 35))
    self.progressBar.setMaximumSize(QtCore.QSize(1000, 35))
    self.progressBar.setProperty("value", 0)
    self.progressBar.setObjectName("progressBar")

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

def retranslateUi(self, Form):
    _translate = QtCore.QCoreApplication.translate
    Form.setWindowTitle(_translate("Form", "Progress bar"))

ProgressBar.py - 调用 ProgrssBar.ui

from PyQt5 import QtCore, QtGui, QtWidgets
import sys

from ProgressBar_ui import Ui_Form

class ProgressBar(QtWidgets.QDialog, Ui_Form):
    def __init__(self, desc = None, parent=None):
        super(ProgressBar, self).__init__(parent)
        self.setupUi(self)
        self.show()

        if desc != None:
            self.setDescription(desc)

    def setValue(self, val): # Sets value
        self.progressBar.setProperty("value", val)

    def setDescription(self, desc): # Sets Pbar window title
        self.setWindowTitle(desc)

def main():
    app = QtWidgets.QApplication(sys.argv)      # A new instance of QApplication
    form = ProgressBar('pbar')                        # We set the form to be our MainWindow (design)
    app.exec_()                                 # and execute the app

if __name__ == '__main__':                      # if we're running file directly and not importing it
    main()                                      # run the main function

Main_program.py - 从这里运行

from PyQt5.QtWidgets import QApplication, QWidget, QPushButton, QMessageBox
from ProgressBar import ProgressBar
import sys, time

class App(QWidget):
    def __init__(self):
        super().__init__()
        self.title = 'PyQt5 button - pythonspot.com'
        self.left = 200
        self.top = 200
        self.width = 320
        self.height = 200
        self.initUI()

    def initUI(self):
        self.setWindowTitle(self.title)
        self.setGeometry(self.left, self.top, self.width, self.height)

        button = QPushButton('PyQt5 button', self)
        button.setToolTip('This is an example button')
        button.move(100, 70)
        button.clicked.connect(self.on_click)

        self.show()

    def on_click(self):
        pb = ProgressBar()

        for i in range(0, 100):
            time.sleep(0.05)
            pb.setValue(((i + 1) / 100) * 100)
            QApplication.processEvents()

        pb.close()

        QMessageBox.information(self, "Message", "Data Loaded")

if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = App()
    sys.exit(app.exec_())

Answer 2

最终找到了解决方案。 3个问题：

1) 只应在主应用程序中调用QApplication 一次，而不应再次调用

2) Add QApplication.processEvents() 到 forloop，因此它会不断更新进度条

3) 在 forloop 之后添加 window.close() 使其关闭