python-3.x - 启动时在 QcomboBox 中显示特定项目
问题描述
我有一个QcomboBox
里面有一些物品。当 Widget 启动并显示QcomboBox
. 如何通过启动QcomboBox
强制显示列表中的第三项?( Index(2))
from PyQt5 import QtWidgets, QtGui
class combo(QtWidgets.QWidget):
def __init__(self, parent = None):
super(combo, self).__init__(parent)
layout = QtWidgets.QHBoxLayout(self)
self.cb = QtWidgets.QComboBox()
self.cb.addItems(["1", "2", "3","4"])
layout.addWidget(self.cb)
if __name__ == '__main__':
import sys
app = QtWidgets.QApplication(sys.argv)
ex = combo()
ex.show()
sys.exit(app.exec_())
解决方案
可以使用 setCurrentIndex() 设置当前项目。
from PyQt5 import QtWidgets, QtGui
class combo(QtWidgets.QWidget):
def __init__(self, parent = None):
super(combo, self).__init__(parent)
layout = QtWidgets.QHBoxLayout(self)
self.cb = QtWidgets.QComboBox()
self.cb.addItems(["1", "2", "3","4"])
self.cb.setCurrentIndex(2) # <---
layout.addWidget(self.cb)
if __name__ == '__main__':
import sys
app = QtWidgets.QApplication(sys.argv)
ex = combo()
ex.show()
sys.exit(app.exec_())