PyQt5 – 获取组合框中所选项目的当前索引

在这篇文章中，我们将看到如何获取组合框中所选项目的当前索引。为了达到这个目的，我们将使用currentIndex方法。

语法： combo_box.currentIndex()

参数： 它不需要参数

返回： 它返回整数，即所选项目的索引。

实施步骤 –

1.创建一个组合框

2.在组合框中添加项目

3.创建按钮

4.给按钮添加动作

5.创建标签以显示计数

6.在动作中，用currentIndex方法获取组合框中当前项目的索引，并将其存储在变量中

7.用setText方法的帮助在标签中显示索引。

下面是实现方法

# importing libraries
from PyQt5.QtWidgets import *
from PyQt5 import QtCore, QtGui
from PyQt5.QtGui import *
from PyQt5.QtCore import *
import sys
 
 
class Window(QMainWindow):
 
    def __init__(self):
        super().__init__()
 
        # setting title
        self.setWindowTitle("Python ")
 
        # setting geometry
        self.setGeometry(100, 100, 600, 400)
 
        # calling method
        self.UiComponents()
 
        # showing all the widgets
        self.show()
 
    # method for widgets
    def UiComponents(self):
 
        # creating a combo box widget
        self.combo_box = QComboBox(self)
 
        # setting geometry of combo box
        self.combo_box.setGeometry(200, 150, 120, 30)
 
        # geek list
        geek_list = ["Geek", "Geeky Geek", "Legend Geek", "Ultra Legend Geek"]
 
        # adding list of items to combo box
        self.combo_box.addItems(geek_list)
 
        # creating push button
        button = QPushButton("Show content ", self)
 
        print(self.combo_box.count())
 
        # adding action to button
        button.pressed.connect(self.find)
 
        # creating label
        self.label = QLabel(self)
 
        # setting geometry of the label
        self.label.setGeometry(200, 200, 200, 30)
 
    def find(self):
 
        # finding the current item index  in combo box
        index = self.combo_box.currentIndex()
 
        # showing content on the screen through label
        self.label.setText("Index : " + str(index))
 
# create pyqt5 app
App = QApplication(sys.argv)
 
# create the instance of our Window
window = Window()
 
# start the app
sys.exit(App.exec())