PyQt5 - 访问 ComboBox 中项目的角色

在本文中，我们将了解如何访问组合框中的项目角色。默认情况下，当我们创建组合框并向其中添加项目时，不会为项目设置角色。为了设置角色，我们使用itemData方法，为了访问角色，我们使用setItemData方法。

Syntax : combo_box.temData(index)

Argument : It takes integer as argument

Return : It will return string i.e role

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)
  
        # setting roles to the items
        self.combo_box.setItemData(0, "First role")
        self.combo_box.setItemData(1, "Second role")
        self.combo_box.setItemData(2, "Third role")
        self.combo_box.setItemData(3, "Forth role")
  
        # getting role
        role = self.combo_box.itemData(0)
  
        # creating label to print the role
        label = QLabel("Geek role : " + role, self)
  
        # setting geometry
        label.setGeometry(200, 200, 150, 30)
  
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())

输出：