PyQt5 – 在组合框中获取所选项目的角色

在这篇文章中，我们将看到如何在组合框中获取所选项目的角色。角色基本上是随项目提供的附加数据，为了获得所选项目的角色，我们使用currentData方法。

语法： combo_box.currentData()

参数： 它不需要参数

返回： 它返回字符串，即所选项目的角色。

以下是实现方法

# 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)
 
        # 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, "Fourth role")
 
        # create push button
        button = QPushButton("Show", self)
 
        # adding action to the button
        button.pressed.connect(self.show_role)
 
        # creating label
        self.label = QLabel(self)
 
        # setting geometry of the label
        self.label.setGeometry(200, 200, 200, 30)
 
    def show_role(self):
 
        # getting the role of selected item
        role = self.combo_box.currentData()
 
        # showing the role throw label
        self.label.setText(role)
 
# create pyqt5 app
App = QApplication(sys.argv)
 
# create the instance of our Window
window = Window()
 
# start the app
sys.exit(App.exec())