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#计数器控件QSpinBoximport sysfrom 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_())

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