在 pyqt5 中更改另一个 ComboBox 项时更改 ComboBox 项

Change ComboBox item when another ComboBox item is changed in pyqt5

我的 GUI 中有两个组合框。我想根据第一个组合框的选定值更改第二个组合框中的值。

就像第一个组合框包含值 a、b、c。 When a is selected, the second combobox will have values 1,2,3. When b is selected, the second combobox will have values 4,5,6 and so on.

我正在尝试将 if else 语句与 currentText() 方法一起使用,但它没有改变。

这是我的代码:

python ui:

class Ui_Dialog(object):
    def setupUi(self, Dialog):
        Dialog.setObjectName("Dialog")
        Dialog.resize(832, 625)
        Dialog.setStyleSheet("background-color: rgb(85, 255, 255);")
        self.comboBox = QtWidgets.QComboBox(Dialog)
        self.comboBox.setGeometry(QtCore.QRect(140, 190, 481, 41))
        self.comboBox.setStyleSheet("background-color: rgb(255, 255, 255);")
        self.comboBox.setObjectName("comboBox")
        self.comboBox_2 = QtWidgets.QComboBox(Dialog)
        self.comboBox_2.setGeometry(QtCore.QRect(140, 290, 481, 41))
        self.comboBox_2.setStyleSheet("background-color: rgb(255, 255, 255);")
        self.comboBox_2.setObjectName("comboBox_2")

        self.retranslateUi(Dialog)
        QtCore.QMetaObject.connectSlotsByName(Dialog)

    def retranslateUi(self, Dialog):
        _translate = QtCore.QCoreApplication.translate
        Dialog.setWindowTitle(_translate("Dialog", "Dialog"))

主要

class cbox(QtWidgets.QDialog, Ui_Dialog):
    def __init__(self):
        super(cbox,self).__init__()
        self.setupUi(self)
        list_1 = ['a', 'b', 'c']
        self.comboBox.addItems(list_1)
        list_2 = ['1','2','3']
        list_3 = ['4','5', '6']
        list_4 = ['7','8','9']
        if str(self.comboBox.currentText()) == 'a':
            self.comboBox_2.addItems(list_2)
        if str(self.comboBox.currentText()) == 'b':
            self.comboBox_2.addItems(list_3)
        if str(self.comboBox.currentText()) == 'c':
            self.comboBox_2.addItems(list_4)



if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    mwin = cbox()
    mwin.show()
    sys.exit(app.exec_())

我怎样才能正确地做到这一点?

您必须使用 currentIndexChanged 信号,并连接到更新另一个组合的内容的函数。

class cbox(QtWidgets.QDialog, Ui_Dialog):
    def __init__(自我):
        超级(cbox,自我)。__init__()
        self.setupUi(自己)
        list_1 = ['a', 'b', 'c']
        self.comboBox.addItems(list_1)
        list_2 = ['1','2','3']
        list_3 = ['4','5', '6']
        list_4 = ['7','8','9']
        自我.comboBox_2.addItems(list_2)
        <b>self.sub_lists = list_2, list_3, list_4
        self.comboBox.currentIndexChanged.connect(self.updateCombo)</b>

    def updateCombo(自我,索引):
        # 首先,清除组合的当前内容
        自我.comboBox_2.clear()
        # 然后,根据新索引添加新项目
        self.comboBox_2.addItems(self.sub_lists[index])