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PyQt4--《八》单选框QCheckBox

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文字标签之前的矩形框，是多选按钮。
多选按钮默认是不排他的，如果想要手动排他，需要将这些复选框放入QButtonGroup中。

QCheckBox的函数

  • setChecked()：更改按钮状态
  • setText()：设置标签
  • text()：取回标题
  • isChecked()：查看是否被勾选
  • setTriState()：提供无状态变化

QCheckBox的信号

有toggled()信号。还有stateChanged()信号，每次复选框勾选或清除时，都会发射该信号。

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#-*-coding:utf-8-*-
import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *

class window(QWidget):
    def __init__(self, parent=None):
        super(window, self).__init__(parent)
        self.init()

    def init(self):
        # 创建对象
        layout = QHBoxLayout()
        self.button1 = QCheckBox()
        self.button2 = QCheckBox()

        # 设置对象属性
        self.button1.setText(u"按钮1")
        self.button1.setChecked(True)
        self.button1.stateChanged.connect(lambda :self.btnstate(self.button1))# 发射stateChanged信号,这里调用与button2一样

        self.button2.setText(u"按钮2")
        self.button2.toggled.connect(lambda :self.btnstate(self.button2))

        # 添加对象到容器
        layout.addWidget(self.button1)
        layout.addWidget(self.button2)
        self.setLayout(layout)
        self.setWindowTitle(u"复选框demo")

    def btnstate(self, b):
        if str(b.text().toUtf8()) == "按钮1":
            if b.isChecked() == True:
                print str(b.text().toUtf8()) + " is selected"
            else:
                print str(b.text().toUtf8()) + " is deselected"

        if str(b.text().toUtf8()) == "按钮2":
            if b.isChecked() == True:
                print str(b.text().toUtf8()) + " is selected"
            else:
                print str(b.text().toUtf8()) + " is deselected"

def main():
    app = QApplication(sys.argv)
    ex = window()
    ex.show()
    sys.exit(app.exec_())


if __name__ == '__main__':
    main()