PyQt5基础学习-QRadioButton单选按钮 1.QRadioButton().setChecked(设置起始状态) 2.QRadioButton().toggled.connect(连接状态变化时的函数) 3.self.sender(获得当前的焦点变化按钮)

使用QRadioButton().toggled.connect连接需要变化的函数，在函数中通过判断单选框状态()来self.sender().isChecked()进行变化

QRadioButtonDemo.py 

"""

单选按钮控件(QRadioButton)

"""

import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *

class QRadioButtonDemo(QWidget):
    def __init__(self):
        super(QRadioButtonDemo, self).__init__()
        self.initUI()

    def initUI(self):
        self.setWindowTitle("QRadioButton")
        layout = QHBoxLayout()
        self.button1 = QRadioButton("单选按钮1")
        self.button1.setChecked(True)

        self.button1.toggled.connect(self.buttonState)
        layout.addWidget(self.button1)

        self.button2 = QRadioButton("单选按钮2")
        self.button2.toggled.connect(self.buttonState)
        layout.addWidget(self.button2)

        self.button3 = QRadioButton("单选按钮3")
        self.button3.toggled.connect(self.buttonState)
        layout.addWidget(self.button3)

        self.setLayout(layout)
    def buttonState(self):
        radioButton = self.sender()

        if radioButton.isChecked() == True:
            print('<' + radioButton.text() + '> 被选中')
        else:
            print("<" + radioButton.text() + "> 被取消选中状态")


if __name__ == "__main__":
    app = QApplication(sys.argv)

    main = QRadioButtonDemo()
    main.show()

    sys.exit(app.exec_())