PyQt5 QDoubleSpinBox – 降级

在本文中，我们将了解如何以编程方式降低 QDoubleSpinBox 的值。双旋转框可以接受十进制值作为输入，我们可以通过setValue方法来设置值，如果选择自适应十进制类型，则默认递减只会递减 1 或递减十进制值。

In order to do this we will use stepDown method with the double spin box object.

Syntax : dd_spin.stepDown()

Argument : It takes no argument

Return : It returns None

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, 500, 400)
  
        # calling method
        self.UiComponents()
  
        # showing all the widgets
        self.show()
  
    # method for components
    def UiComponents(self):
  
        # creating double spin box
        d_spin = QDoubleSpinBox(self)
  
        # setting geometry to the double spin box
        d_spin.setGeometry(100, 100, 150, 40)
  
  
        # step type
        step_type = QAbstractSpinBox.AdaptiveDecimalStepType
  
        # adaptive step type
        d_spin.setStepType(step_type)
  
        # creating a label
        label = QLabel("GeeksforGeeks", self)
  
        # setting geometry to the label
        label.setGeometry(100, 200, 300, 80)
  
        # making label multi line
        label.setWordWrap(True)
  
        # push button
        push = QPushButton("Press", self)
  
        # setting geometry to the push button
        push.setGeometry(100, 150, 100, 35)
  
        # adding action to the push button
        # stepping down the value
        push.clicked.connect(lambda: d_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 ：