PyQt5 ComboBox - 用户输入的项目未存储在下拉菜单中

在本文中，我们将看到用户输入的项目如何不被添加到组合框中，即当用户在可编辑组合框中插入项目时，它不会插入到下拉列表的任何位置，默认情况下，当用户插入任何它被插入底部的项目。
如果我们使用普通的，即不可编辑的组合框，用户不能向组合框添加任何项目，但可编辑的组合框允许用户编辑项目或从项目列表中搜索项目。有时需要组合框应该是可编辑的，并且它不插入任何项目，例如在选择国家的组合框中，可编辑的组合框将有助于搜索国家，并且不允许用户添加另一个项目。

In order to make combo box such that item inserted by user don’t get added in the drop down list we have to do the following –
1. Create a combo box
2. Make the combo box editable using setEditable method
3. Set insertion policy of combo box to do not insert
4. Create label
5. Retrieve the insertion policy and show it with the help of label

编程需要懂一点英语

下面是实现——

Python3

# 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)
 
        # creating editable combo box
        self.combo_box.setEditable(True)
 
        # setting insertion policy
        # stopping insertion
        self.combo_box.setInsertPolicy(QComboBox.NoInsert)
 
        # getting current insertion policy
        policy = self.combo_box.insertPolicy()
 
        # creating label to  print the policy
        label = QLabel("Insertion policy = " + str(policy), self)
 
        # setting geometry of the label
        label.setGeometry(200, 100, 200, 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：