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import sys

from PyQt4 import QtGui, QtCore

class Example(QtGui.QWidget):

    def __init__(self):

        super(Example, self).__init__()

        self.initUI()

    def initUI(self):

        self.pbar = QtGui.QProgressBar(self)

        self.pbar.setGeometry(30, 40, 200, 25)

        self.btn = QtGui.QPushButton(‘Start‘, self)

        self.btn.move(40, 80)

        self.btn.clicked.connect(self.doAction)

        self.timer = QtCore.QBasicTimer()

        self.step = 0

        self.setGeometry(300, 300, 280, 170)

        self.setWindowTitle(‘QtGui.QProgressBar‘)

        self.show()

    def timerEvent(self, e):

        if self.step >= 100:

            self.timer.stop()

            self.btn.setText(‘Finished‘)

            return

        self.step = self.step + 1

        self.pbar.setValue(self.step)

    def doAction(self):

        if self.timer.isActive():

            self.timer.stop()

            self.btn.setText(‘Start‘)

        else:

            self.timer.start(100, self)

            self.btn.setText(‘Stop‘)

def main():

    app = QtGui.QApplication(sys.argv)

    ex = Example()

    sys.exit(app.exec_())

if __name__ == ‘__main__‘:

    main()

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原文地址：http://www.cnblogs.com/mhxy13867806343/p/4201474.html