PyQt5 QDial 滑块的值变化信号
在这篇文章中,我们将看到我们如何获得QDial的滑块的值变化信号。用户可以通过鼠标的帮助来改变数值,尽管我们可以通过setValue方法以编程的方式来改变它。当滑块的值被改变时,这个信号就会发出来。
为了做到这一点,我们使用QDial对象的valueChanged方法。
语法: dial.valueChanged.connect(method)
参数: 它以方法作为参数
返回: 它返回无。
下面是实现方法
# 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)
# making notch visible
dial.setNotchesVisible(True)
# value
value = 50
# setting value to the dial slider
dial.setValue(value)
# creating a label
label = QLabel("GeeksforGeeks", self)
# setting geometry to the label
label.setGeometry(220, 125, 200, 60)
# making label multiline
label.setWordWrap(True)
# getting slider value
value = dial.value()
# setting text to the label
label.setText("Value : " + str(value))
# getting value changed signal
dial.valueChanged.connect(lambda: label.setText("Value = " + str(dial.value())))
# create pyqt5 app
App = QApplication(sys.argv)
# create the instance of our Window
window = Window()
# start the app
sys.exit(App.exec())