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小编给大家分享一下PyQt5如何实现下载进度条效果，相信大部分人都还不怎么了解，因此分享这篇文章给大家参考一下，希望大家阅读完这篇文章后大有收获，下面让我们一起去了解一下吧！
界面文件UI_download.py
# -*- coding: utf-8 -*-
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.Qt import Qt
class Ui_download(object):
def setupUi(self, Dialog):
Dialog.setWindowFlags(Qt.FramelessWindowHint)
Dialog.setObjectName("Dialog")
Dialog.resize(300, 56)
Dialog.setFixedSize(Dialog.width(), Dialog.height())
sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Fixed, QtWidgets.QSizePolicy.Fixed)
sizePolicy.setHorizontalStretch(0)
sizePolicy.setVerticalStretch(0)
sizePolicy.setHeightForWidth(Dialog.sizePolicy().hasHeightForWidth())
Dialog.setSizePolicy(sizePolicy)
Dialog.setSizeGripEnabled(True)
self.gridLayout = QtWidgets.QGridLayout(Dialog)
self.gridLayout.setSizeConstraint(QtWidgets.QLayout.SetDefaultConstraint)
self.gridLayout.setObjectName("gridLayout")
self.progressBar = QtWidgets.QProgressBar(Dialog)
self.progressBar.setProperty("value", 0)
self.progressBar.setAlignment(QtCore.Qt.AlignLeading|QtCore.Qt.AlignLeft|QtCore.Qt.AlignVCenter)
self.progressBar.setObjectName("progressBar")
self.gridLayout.addWidget(self.progressBar, 1, 0, 1, 1)
self.label = QtWidgets.QLabel(Dialog)
self.label.setObjectName("label")
self.gridLayout.addWidget(self.label, 0, 0, 1, 1)
self.retranslateUi(Dialog)
QtCore.QMetaObject.connectSlotsByName(Dialog)
def retranslateUi(self, Dialog):
_translate = QtCore.QCoreApplication.translate
Dialog.setWindowTitle(_translate("Dialog", "Dialog"))
self.label.setText(_translate("Dialog", "客户端更新下载中..."))
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
Dialog = QtWidgets.QDialog()
ui = Ui_download()
ui.setupUi(Dialog)
Dialog.show()
sys.exit(app.exec_())实现文件download.py
# -*- coding: utf-8 -*-
"""
Module implementing Dialog.
"""
from PyQt5.QtCore import QThread, pyqtSignal
from PyQt5.QtWidgets import QDialog
from PyQt5 import QtWidgets
from Ui_download import Ui_download
import os
import sys
import requests
class downloadThread(QThread):
download_proess_signal = pyqtSignal(int)
def __init__(self, download_url, filesize, fileobj, buffer):
super(downloadThread, self).__init__()
self.download_url = download_url
self.filesize = filesize
self.fileobj = fileobj
self.buffer = buffer
def run(self):
try:
f = requests.get(self.download_url, stream=True)
offset = 0
for chunk in f.iter_content(chunk_size=self.buffer):
if not chunk:
break
self.fileobj.seek(offset)
self.fileobj.write(chunk)
offset = offset + len(chunk)
proess = offset / int(self.filesize) * 100
self.download_proess_signal.emit(int(proess))
self.fileobj.close()
self.exit(0)
except Exception as e:
print(e)
class download(QDialog, Ui_download):
"""
下载类实现
"""
def __init__(self, download_url, auto_close=True, parent=None):
"""
Constructor
@download_url:下载地址
@auto_close:下载完成后时候是否需要自动关闭
"""
super(download, self).__init__(parent)
self.setupUi(self)
self.progressBar.setValue(0)
self.downloadThread = None
self.download_url = download_url
self.filesize = None
self.fileobj = None
self.auto_close = auto_close
self.download()
def download(self):
self.filesize = requests.get(self.download_url, stream=True).headers['Content-Length']
path = os.path.join("update", os.path.basename(self.download_url))
self.fileobj = open(path, 'wb')
self.downloadThread = downloadThread(self.download_url, self.filesize, self.fileobj, buffer=10240)
self.downloadThread.download_proess_signal.connect(self.change_progressbar_value)
self.downloadThread.start()
def change_progressbar_value(self, value):
self.progressBar.setValue(value)
if self.auto_close and value == 100:
self.close()
if __name__ == '__main__':
app = QtWidgets.QApplication(sys.argv)
ui = download()
ui.show()
sys.exit(app.exec_())比较通用的一个下载模块，初始化调用的时候只需要传入要下载的地址就行，下载操作采取异步，以防阻塞UI，确保程序目录下拥有update目录存在，默认我是将要更新的文件放在这个目录下面，还有优化的地方希望大家可以指出。
运行后效果：
以上是“PyQt5如何实现下载进度条效果”这篇文章的所有内容，感谢各位的阅读！相信大家都有了一定的了解，希望分享的内容对大家有所帮助，如果还想学习更多知识，欢迎关注创新互联成都网站设计公司行业资讯频道！
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