PyQt5 QCalendarWidget – 选择改变信号

在本文中，我们将了解如何从 QCalendarWidget 获取选择更改信号。当当前选择的日期改变时，会发出选择改变信号。用户可以使用鼠标或键盘更改当前选择的日期。

In order to do this we will use selectionChanged method with the QCalendarWidget object.
Syntax : calendar.selectionChanged.connect(lambda: print(“Selection Changed”))
Argument : It takes method as argument
Action Performed : It will print the message whenever activated signal get emitted

编程需要懂一点英语

下面是实现

Python3

# 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 components
    def UiComponents(self):
 
        # creating a QCalendarWidget object
        calendar = QCalendarWidget(self)
 
        # setting geometry to the calendar
        calendar.setGeometry(10, 10, 400, 250)
 
        # creating a label
        label = QLabel(self)
 
        # setting geometry to the label
        label.setGeometry(100, 280, 250, 60)
 
        # making label multi line
        label.setWordWrap(True)
 
        # text
        text = "Selection Changed signal (No.) : "
 
        # current count
        self.count = 0
 
        # getting the selection change signal and
        # when receives the signal printing the message
        calendar.selectionChanged.connect(lambda: label.setText(text + str(get_count())))
 
        # method to increase the count value
        def get_count():
            self.count += 1
            return self.count
 
 
# create pyqt5 app
App = QApplication(sys.argv)
 
# create the instance of our Window
window = Window()
 
# start the app
sys.exit(App.exec())

输出：