PyQt5 - 获取 ComboBox 中所选项目的当前索引

在本文中，我们将看到如何获取组合框所选项目的当前索引。为此，我们将使用currentIndex方法。

Syntax : combo_box.currentIndex()

Argument : It takes no argument

Return : It return integer i.e index of selected item

实施步骤——

1.创建一个组合框
2. 将项目添加到组合框
3.创建按钮
4. 为按钮添加动作
5.创建标签以显示计数
5.在action内部，通过currentIndex方法获取当前在combo box中选中的item的索引，并存储到变量中
6. 借助setText方法在标签中显示索引。

下面是实现——

# 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 though 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())

输出：