Python-pyqt5之Progressbar：进度条（实现跑马灯效果）

任务目标：

实现跑马灯效果，单击开始，进度条开始动，单击停止，进度条停止

设计：

 完整代码：

from PyQt5 import QtCore, QtGui, QtWidgets


class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(688, 533)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")

        self.progressBar_1 = QtWidgets.QProgressBar(self.centralwidget)
        self.progressBar_1.setGeometry(QtCore.QRect(160, 30, 400, 60))
        self.progressBar_1.setMaximum(100)#这个设置成100，在开始运行的时候才不会动
        self.progressBar_1.setProperty("value", -1)
        self.progressBar_1.setOrientation(QtCore.Qt.Horizontal)
        self.progressBar_1.setObjectName("progressBar")


        self.progressBar_3 = QtWidgets.QProgressBar(self.centralwidget)
        self.progressBar_3.setGeometry(QtCore.QRect(120, 370, 401, 60))
        self.progressBar_3.setMaximum(100)
        self.progressBar_3.setLayoutDirection(QtCore.Qt.RightToLeft)
        self.progressBar_3.setProperty("value", -1)
        self.progressBar_3.setTextDirection(QtWidgets.QProgressBar.TopToBottom)
        self.progressBar_3.setObjectName("progressBar_3")
        self.progressBar_4 = QtWidgets.QProgressBar(self.
                                                    centralwidget)
        self.progressBar_4.setGeometry(QtCore.QRect(100, 30, 60, 400))
        self.progressBar_4.setMaximum(100)
        self.progressBar_4.setProperty("value", -1)
        self.progressBar_4.setOrientation(QtCore.Qt.Vertical)
        self.progressBar_4.setObjectName("progressBar_4")

        self.progressBar_2 = QtWidgets.QProgressBar(self.centralwidget)
        self.progressBar_2.setGeometry(QtCore.QRect(520, 30, 61, 401))
        self.progressBar_2.setMaximum(100)
        self.progressBar_2.setProperty("value", -1)
        self.progressBar_2.setAlignment(QtCore.Qt.AlignLeading|QtCore.Qt.AlignLeft|QtCore.Qt.AlignTop)
        self.progressBar_2.setOrientation(QtCore.Qt.Vertical)
        self.progressBar_2.setInvertedAppearance(True)
        self.progressBar_2.setObjectName("progressBar_2")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(290, 230, 93, 28))
        self.pushButton.setObjectName("pushButton")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 688, 29))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

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

        self.timer = QtCore.QBasicTimer() # 创建定时器对象
        # 为按钮绑定单击信号
        self.pushButton.clicked.connect(self.running)
    # 控制进度条的滚动效果
    def running(self):
        if self.timer.isActive(): # 判断计时器是否开启
            self.timer.stop() # 停止计时器
            self.pushButton.setText('开始')# 设置按钮的文本
            # 设置4个进度条的最大值为100

            self.progressBar_1.setMaximum(100)
            self.progressBar_2.setMaximum(100)
            self.progressBar_3.setMaximum(100)
            self.progressBar_4.setMaximum(100)

        else:
            self.timer.start(100,MainWindow) # 启动计时器
            self.pushButton.setText('停止') # 设置按钮的文本
            # 将4个进度条的最大值和最小值都设置为0，以便显示循环滚动的效果


            self.progressBar_1.setMinimum(0)
            self.progressBar_1.setMaximum(0)
            self.progressBar_2.setMinimum(0)
            self.progressBar_2.setMaximum(0)
            self.progressBar_3.setMinimum(0)
            self.progressBar_3.setMaximum(0)
            self.progressBar_4.setMinimum(0)
            self.progressBar_4.setMaximum(0)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "跑马灯效果"))
        self.pushButton.setText(_translate("MainWindow", "开始"))


import sys
if __name__ == '__main__':
    app=QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

效果：