PyQt5 QCalendarWidget 选择改变的信号

在这篇文章中，我们将看到如何从QCalendarWidget中获得选择改变的信号。当当前选择的日期被改变时，会发出选择改变的信号。当前选择的日期可以由用户使用鼠标或键盘来改变。

为了做到这一点，我们将使用QCalendarWidget对象的selectionChanged方法。

语法： calendar.selectionChanged.connect(lambda: print("Selection Changed" ) )

参数： 它将方法作为参数
执行的动作： 每当激活的信号被发射出去，它将打印信息

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 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())