We can set the state of the check box using setChecked or for tristate check box we can set its states using setCheckState method. nextCheckState sets the next state of the check box i.e for default check box if initial check state is checked, it will set it to un-checked and vice versa. For tri-state check box if check state if un-checked it will set it to intermediate state and if initial state is intermediate, it will set it to checked and if it is checked it will set it to un-checked.
Syntax : checkbox.nextCheckState() Argument : It takes no argument. Action performed : It will change the state of check box according to the previous state.
Below is the implementation.
# 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 the check-box
checkbox = QCheckBox( 'Geek ?' , self )
# setting geometry of check box
checkbox.setGeometry( 200 , 150 , 100 , 40 )
# making it tristate check box
checkbox.setTristate( True )
# setting check box to its next state
checkbox.nextCheckState()
# create pyqt5 app App = QApplication(sys.argv)
# create the instance of our Window window = Window()
# start the app sys.exit(App. exec ())
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Output :