PyQt5 – 如何获取 ComboBox 中最大可见项目的数量

在本文中，我们将了解如何获取组合框的最大可见项数。默认情况下，组合框下拉列表中一次最多显示 10 个项目，尽管我们可以更改此数字。 setMaxVisibleItems方法用于设置最大可见项的限制。

为了获得最大可见项目数，我们使用maxVisibleItems方法

Syntax : combo_box.maaxVisibleItems()

Argument : It takes no argument

Return : It returns integer

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 max number visible limit
        self.combo_box.setMaxVisibleItems(2)
  
        # getting maximum visible limit
        limit = self.combo_box.maxVisibleItems()
  
        # creating label to show the count
        label = QLabel("Max visible limit = " + str(limit), self)
  
        # setting label geometry
        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())

输出 ：