如何在元素中动态添加/删除元素?

问题是,在您的情况下,当您将父对象传递给小部件时,它相对于父对象被放置在0,0位置 QFrame 位于 QComboBox 因为两者都处于0,0位置。正确的做法是使用布局。另一方面,在为其添加新的小部件之前,您必须删除这些小部件,我们创建了一个删除这些项目的函数。

import sys
from PyQt5.QtWidgets import *

def clearLayout(lay):
    while lay.count() > 0:
        item = lay.takeAt(0)
        widget = item.widget()
        if widget:
            widget.deleteLater()
        del item


class GUI(QWidget):
    def __init__(self):
        super().__init__()
        self.initgui()

    def initgui(self):
        lay = QHBoxLayout(self)
        vlay1 = QVBoxLayout()
        combobox = QComboBox(self)
        combobox.addItems([str(i) for i in range(2, 11)])
        vlay1.addWidget(combobox)
        vlay1.addItem(QSpacerItem(20, 245, QSizePolicy.Minimum, QSizePolicy.Expanding))

        self.vlay2 = QVBoxLayout()
        lay.addLayout(vlay1)
        lay.addLayout(self.vlay2)
        self.comboboxchanged(combobox.currentText())
        combobox.activated[str].connect(self.comboboxchanged)
        self.setWindowTitle("Testing Easy Setup")
        self.show()

    def comboboxchanged(self, text):
        clearLayout(self.vlay2)
        for num in range(0, int(text)):
            self.vlay2.addWidget(QLineEdit(self))
        self.vlay2.addItem(QSpacerItem(20, 245, QSizePolicy.Minimum, QSizePolicy.Expanding))

if __name__ == '__main__':
    app = QApplication(sys.argv)
    gui = GUI()
    sys.exit(app.exec_())