PyQT5计数器控件

#计数器控件QSpinBox

import sys
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
from PyQt5.QtGui import *

class QSpinBoxDemo(QWidget):
    def __init__(self):
        super(QSpinBoxDemo,self).__init__()
        self.initUI()

    def initUI(self):

        self.setWindowTitle('QSpinBox演示')
        self.resize(300,200)

        layout = QVBoxLayout()
        self.label = QLabel('当前值: 2')
        self.label.setAlignment(Qt.AlignCenter)

        layout.addWidget(self.label)
        self.spinb = QSpinBox()
        self.spinb.setValue(2)
        layout.addWidget(self.spinb)

        self.spinb.valueChanged.connect(self.valuechange)

        self.setLayout(layout)

    def valuechange(self):
        self.label.setText('当前值：'+str(self.spinb.value()))

if __name__ == '__main__':
    app =QApplication(sys.argv)

    main = QSpinBoxDemo()
    main.show()
    app.exit(app.exec_())