PyQt5 QSpinBox – 添加动作

在本文中，我们将看到如何向旋转框添加动作，动作基本上是旋转框每次更改其值时调用的方法。每次用户更改值时，都会向旋转框添加操作，应该会发生一些事情。

为了添加动作，我们将使用spin_box.valueChanged.connect方法。

Syntax : spin_box.valueChanged.connect(method_name)

Argument : It takes method name as argument

Action performed : Every time the value of spin box changes method will get called

编程需要懂一点英语

实施步骤：

1.创建一个旋转框
2.创建标签以显示值
3. 为旋转框添加动作
4.在action方法里面获取当前值并通过label显示出来

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, 100, 40)
  
        # adding action to the spin box
        self.spin.valueChanged.connect(self.show_result)
  
        # creating label show result
        self.label = QLabel(self)
  
        # setting geometry
        self.label.setGeometry(100, 200, 200, 40)
  
    # method called by spin box
    def show_result(self):
  
        # getting current value
        value = self.spin.value()
  
        # setting value of spin box to the label
        self.label.setText("Value : " + str(value))
  
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
window.show()
  
# start the app
sys.exit(App.exec())

输出：