PyQt5基础学习-QCheckBox()复选框 1.QCheckBox().stateChanged(状态变化时调用函数) 2.self.checkBox3.setTristate(设置半选中状态)

复选框的状态主要有3种， 1.选中，2.未选中，3.半选中，使用QcheckBox().checkState()进行状态的查看
QCheckBoxDemo.py 

"""
复选框控件(QCheckBox)

3种状态

未远中:0

半选中: 1

选中: 2
"""

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

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

    def initUI(self):
        self.setWindowTitle("复选框控件演示")

        layout = QHBoxLayout()

        self.checkBox1 = QCheckBox('复选框控件1')
        self.checkBox1.setChecked(True)
        self.checkBox1.stateChanged.connect(lambda: self.checkboxState(self.checkBox1))
        layout.addWidget(self.checkBox1)


        self.checkBox2 = QCheckBox('复选框控件2')
        self.checkBox2.stateChanged.connect(lambda: self.checkboxState(self.checkBox2))
        layout.addWidget(self.checkBox2)


        self.checkBox3 = QCheckBox('半选中')
        self.checkBox3.stateChanged.connect(lambda: self.checkboxState(self.checkBox3))
        #构造半选中状态
        self.checkBox3.setTristate(True)
        #设置初始化状态
        self.checkBox3.setCheckState(Qt.PartiallyChecked)
        layout.addWidget(self.checkBox3)

        self.setLayout(layout)


    def checkboxState(self, cb):
        check1Status = self.checkBox1.text() + ", isChecked=" + str(self.checkBox1.isChecked()) + ', checkState=' + \
        str(self.checkBox1.checkState()) + "\n"
        check2Status = self.checkBox2.text() + ", isChecked=" + str(self.checkBox2.isChecked()) + ', checkState=' + \
        str(self.checkBox2.checkState()) + "\n"
        check3Status = self.checkBox3.text() + ", isChecked=" + str(self.checkBox3.isChecked()) + ', checkState=' + \
                       str(self.checkBox3.checkState()) + "\n"
        print(check1Status + check2Status + check3Status)

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

    main = QCheckBoxDemo()
    main.show()

    sys.exit(app.exec_())