PyQt5 – 检查组合框中是否允许重复的值

在这篇文章中，我们将看到如何检查组合框中是否允许重复的插入。默认情况下，不允许重复插入，尽管以编程方式在组合框中插入重复的项目是可能的，但用户不能插入重复的值。为了允许重复插入，我们将使用setDuplicatesEnabled方法。

为了知道是否允许重复的值，我们使用diplicatesEnabled。

语法： combo_box.duplicatesEnabled()

参数： 它不需要参数

返回： 它返回bool

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"]
  
        # adding list of items to combo box
        self.combo_box.addItems(geek_list)
  
        # making it editable combo box
        self.combo_box.setEditable(True)
  
        # allowing duplication of items
        # setting duplicates = True
        self.combo_box.setDuplicatesEnabled(True)
  
        # checking if duplicates are allowed or not
        check = self.combo_box.duplicatesEnabled()
  
        # creating label to show check
        label = QLabel("Duplicates allowed ? : " + str(check), self)
  
        # setting geometry of label
        label.setGeometry(200, 200, 200, 30)
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())