PyQt5 QSpinBox - 使用 stepDown 方法降低值

在本文中，我们将看到如何使用setDown方法降低旋转框的值，我们也可以借助箭头按钮来提高旋转框的值，但是为了降低值，我们使用setDown方法。

为此，我们使用setDown方法。

Syntax : spin_box.setDown()

Argument : It takes no argument

Action performed : It decrement the value of spin box

实施步骤：
1.创建一个旋转框
2.创建一个按钮
3.为按钮添加动作
4.在action里面调用stepDown方法

下面是实现

# importing libraries
from PyQt5.QtWidgets import * 
from PyQt5 import QtCore, QtGui
from PyQt5.QtGui import * 
from PyQt5.QtCore import * 
import sys
  
  
class Window(QMainWindow):
  
    def __init__(self):
        super().__init__()
  
        # setting title
        self.setWindowTitle("Python ")
  
        # setting geometry
        self.setGeometry(100, 100, 600, 400)
  
        # calling method
        self.UiComponents()
  
        # showing all the widgets
        self.show()
  
    # method for widgets
    def UiComponents(self):
        # creating spin box
        self.spin = QSpinBox(self)
  
        # setting geometry to spin box
        self.spin.setGeometry(100, 100, 250, 40)
  
        # setting prefix to spin
        self.spin.setPrefix("Prefix ")
  
        # setting suffix to spin
        self.spin.setSuffix(" Suffix")
  
        # creating a push button
        push = QPushButton("Press", self)
  
        # setting geometry to the push button
        push.setGeometry(100, 200, 100, 40)
  
        # adding action to the push button
        push.clicked.connect(self.do_action)
  
    # method called by push button
    def do_action(self):
  
        # step down the value of spin box
        self.spin.stepDown()
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())

输出 ：