這篇文章主要為大家詳細介紹了PyQt5實現下載進度條效果，具有一定的參考價值，有興趣的小伙伴們可以參考一下
起因是因為公司要開發一款自動登錄某網站的助手工具提供給客戶使用，要使用到selenium，所以選擇了pyqt5的方式來開發這個C/S架構的客戶端
在過程中要用到自動更新的功能，所以自己寫一個下載進度的插件跟大家分享，本人編程程度有點菜，不要見怪。
介面檔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_())#實作檔案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_())比較通用的一個下載模組，初始化呼叫的時候只需要傳入要下載的位址就行，下載操作採取異步，以防阻塞UI，確保程式目錄下擁有update目錄存在，預設我是將要更新的檔案放在這個目錄下面，還有優化的地方希望大家可以指出。
運行後效果：
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