PyQt5 QDial

QDial 是PyQt5中的一个类，它为用户提供了在程序定义的范围内选择数值的功能，并且这个范围是环绕的（例如，角度从0到359度）。此外，它还可以用类似于速度表的方式来显示当前值。下面是QDial的外观

例子：

一个有QDial的窗口，用户可以改变它的数值，当用户改变数值时，当前的数值将显示在标签上。

以下是实现的过程

# 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 QDial object
        dial = QDial(self)
  
        # setting geometry to the dial
        dial.setGeometry(100, 100, 100, 100)
  
        # adding action to the dial
        dial.valueChanged.connect(lambda: dial_method())
  
        # creating a label
        label = QLabel("GeeksforGeeks", self)
  
        # setting geometry to the label
        label.setGeometry(220, 125, 200, 60)
  
        # making label multiline
        label.setWordWrap(True)
  
        # method called by the dial
        def dial_method():
  
            # getting dial value
            value = dial.value()
  
            # setting text to the label
            label.setText("Current Value : " + str(value))
  
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())