https://www.cnblogs.com/itwangqiang/articles/14959401.html
https://blog.csdn.net/weixin_43990846/article/details/123880081

进度条用于向用户指示操作的进度，并向他们保证应用程序仍在运行

例 1

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QPushButton, QProgressBar
from PyQt5.QtCore import QBasicTimerclass MyClass(QWidget):def __init__(self):super().__init__()self.initUI()def initUI(self):self.resize(300, 200)# 载入进度条控件self.pgb = QProgressBar(self)self.pgb.move(50, 50)self.pgb.resize(250, 20)# 配置一个值表示进度条的当前进度self.pv = 0# 申明一个时钟控件self.timer1 = QBasicTimer()# 设置进度条的范围self.pgb.setMinimum(0)self.pgb.setMaximum(100)self.pgb.setValue(self.pv)# 载入按钮self.btn = QPushButton("开始", self)self.btn.move(50, 100)self.btn.clicked.connect(self.myTimerState)self.show()def myTimerState(self):if self.timer1.isActive():self.timer1.stop()self.btn.setText("开始")else:self.timer1.start(100, self)self.btn.setText("停止")def timerEvent(self, e):if self.pv == 100:self.timer1.stop()self.btn.setText("完成")else:self.pv += 1self.pgb.setValue(self.pv)if __name__ == "__main__":app = QApplication(sys.argv)mc = MyClass()app.exec_()

例2

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QPushButton, QProgressBar
from PyQt5.QtCore import QBasicTimer
from PyQt5.QtGui import QFontclass MyClass(QWidget):def __init__(self):super().__init__()self.initUI()def initUI(self):self.resize(500, 300)# 载入进度条控件self.pgb = QProgressBar(self)self.pgb.move(50, 50)self.pgb.resize(250, 20)self.pgb.setStyleSheet("QProgressBar { border: 2px solid grey; border-radius: 5px; color: rgb(20,20,20);  background-color: #FFFFFF; text-align: center;}QProgressBar::chunk {background-color: rgb(100,200,200); border-radius: 10px; margin: 0.1px;  width: 1px;}")## 其中 width 是设置进度条每一步的宽度## margin 设置两步之间的间隔#设置字体font = QFont()font.setBold(True)font.setWeight(30)self.pgb.setFont(font)# 设置一个值表示进度条的当前进度self.pv = 0# 申明一个时钟控件self.timer1 = QBasicTimer()# 设置进度条的范围self.pgb.setMinimum(0)self.pgb.setMaximum(100)self.pgb.setValue(self.pv)## 设置进度条文字格式self.pgb.setFormat('Loaded  %p%'.format(self.pgb.value()-self.pgb.minimum()))# 加载pushbutton1self.btn_start = QPushButton("begin", self)self.btn_start.move(50, 100)self.btn_start.clicked.connect(self.myTimerState)# 加载 pushbutton 2self.btn_update = QPushButton("update", self)self.btn_update.move(150, 100)self.btn_update.clicked.connect(self.update_event)def myTimerState(self):if self.timer1.isActive():self.timer1.stop()self.btn_start.setText("begin")else:self.timer1.start(100, self)self.btn_start.setText("stop")def timerEvent(self, e):if self.pv == 100:self.timer1.stop()self.btn_start.setText("Finish")else:self.pv += 1self.pgb.setValue(self.pv)def update_event(self):if self.timer1.isActive():self.timer1.stop()self.btn_start.setText("begin")self.pv = 0self.pgb.setValue(self.pv)if __name__ == "__main__":app = QApplication(sys.argv)mytask = MyClass()mytask.show()app.exec_()