PyQT5之计数器控件QSpinBox

import sys
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
from PyQt5.QtGui import *class spindemo(QWidget):def __init__(self, parent=None):super(spindemo, self).__init__(parent)#设置标题与初始大小self.setWindowTitle('SpinBox 例子')self.resize(300,100)#垂直布局layout=QVBoxLayout()#创建按钮并设置居中self.l1=QLabel('current value')self.l1.setAlignment(Qt.AlignCenter)layout.addWidget(self.l1)#创建计数器，并添加控件，数值改变时发射信号触发绑定事件self.sp=QSpinBox()layout.addWidget(self.sp)self.sp.valueChanged.connect(self.Valuechange)self.setLayout(layout)def Valuechange(self):#显示当前计数器地数值self.l1.setText('current value:'+str(self.sp.value()))if __name__ == '__main__':app = QApplication(sys.argv)ex = spindemo()ex.show()sys.exit(app.exec_())