3

我是 PyQT5 的新手，我想要几个按钮，最后一个按钮处于“选中”状态。当单击另一个按钮时，前一个按钮会“未选中”，而单击的按钮会“选中”。

import sys
from PyQt5.QtWidgets import *

class Example(QWidget):
    def __init__(self):
        super().__init__()
        self.setGeometry(30, 30, 400, 200)
        self.initUI()

    def initUI(self):
        self.button1 = QPushButton(self)
        self.button1.setGeometry(40, 40, 100, 50)
        self.button1.setText("Button 1")

        self.button2 = QPushButton(self)
        self.button2.setGeometry(150, 40, 100, 50)
        self.button2.setText("Button 2")

        self.show()

if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())
4

3 回答 3

5

在您的代码的基础上，您可以添加button1和并将属性设置button2为.QButtonGroupexclusiveTrue

class Example(QWidget):
    def __init__(self):
        super().__init__()
        self.setGeometry(30, 30, 400, 200)
        self.initUI()

    def initUI(self):
        self.button1 = QPushButton(self)
        self.button1.setGeometry(40, 40, 100, 50)
        self.button1.setText("Button 1")

        self.button2 = QPushButton(self)
        self.button2.setGeometry(150, 40, 100, 50)
        self.button2.setText("Button 2")

        self.btn_grp = QButtonGroup()
        self.btn_grp.setExclusive(True)
        self.btn_grp.addButton(self.button1)
        self.btn_grp.addButton(self.button2)

        self.btn_grp.buttonClicked.connect(self.on_click)

        self.show()

    def on_click(self, btn):
        pass # do something with the button clicked

if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())

在这里，我还将一个空插槽连接到信号QButtonGroup.buttonClicked，每当单击组中的按钮时都会发出该信号。

要找出哪个按钮是当前选中的按钮，您可以调用方法QButtonGroup.checkedButton()和QButtonGroup.checkedId()。前者将返回一个QButton对象，后者将返回一个 index int，对应于按钮添加到组中的顺序。

于 2017-03-14T11:37:53.197 回答
2

您可以使用 functools partial 或 sender 方法来检查按下了哪个按钮：

import sys
from PyQt5.QtWidgets import *
from functools import partial
class Example(QWidget):
    def __init__(self):
        super().__init__()
        self.setGeometry(30, 30, 400, 200)
        self.initUI()

    def initUI(self):
        self.button1 = QPushButton(self)
        self.button1.setGeometry(40, 40, 100, 50)
        self.button1.setText("Button 1")
        self.button1.clicked.connect(partial(self.clicked_btn, 'Button 1'))

        self.button2 = QPushButton(self)
        self.button2.setGeometry(150, 40, 100, 50)
        self.button2.setText("Button 2")
        self.button2.clicked.connect(partial(self.clicked_btn, 'Button 2'))

        self.show()

    def clicked_btn(self, value):
        print(f'{value} clicked')
        sender = self.sender()
        print(f'Sender says: {sender.text()} was clicked')

if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())
于 2021-09-07T23:18:33.187 回答
0
  1. 通过 setCheckable(True) 使按钮可检查

  2. 将按钮添加到 QButtonGroup() 中，其余按钮会自动排序：

    class Example(QWidget):
   def __init__(self):
       super().__init__()
       self.setGeometry(30, 30, 400, 200)
       self.initUI()

   def initUI(self):
       self.button1 = QPushButton(self)
       self.button1.setGeometry(40, 40, 100, 50)
       self.button1.setText("Button 1")
       self.button1.setCheckable(True)
       self.button2 = QPushButton(self)
       self.button2.setGeometry(150, 40, 100, 50)
       self.button2.setText("Button 2")
       self.button2.setCheckable(True)

       self.my_button_group = QButtonGroup()
       self.my_button_group.addButton(self.button1)
       self.my_button_group.addButton(self.button2)

       self.show()
于 2017-03-13T21:33:22.150 回答