PyQt5 - 通过他们在组合框中的角色查找项目
在本文中,我们将看到如何通过组合框中的角色找到项目,默认情况下,当我们创建组合框并向其中添加项目时,没有为项目设置角色。为了设置角色使用setItemData
方法。
为了找到项目,我们将使用findData
方法。
Syntax : combo_box.findData(role)
Argument : It takes string as argument i.e role
Return : It returns index of the given role if role doesn’t exist it return -1
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")
# finding item through role
index = self.combo_box.findData("Third role")
# creating label to show index
label = QLabel("Third role index = " + str(index), 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())
输出 :