• • 此问题在此处已有答案**：

How to make a Qt Widget grow with the window size?（4个答案）
4天前关闭。
我在Qt6 Designer中生成了一个简单的UI，它由QDialog上的QGridLayout（或QMainWindow-问题似乎是相同的）组成。
现在，我想这个布局，以填补整个窗口的大小，并调整自己的大小时，窗口大小的变化。
我怎样才能做到这一点？
下面是我的示例应用程序，其中包含Qt Designer生成的代码以及我自己的一些代码来运行它：

import sys
from PySide6.QtCore import QRect, QCoreApplication, QMetaObject
from PySide6.QtWidgets import QApplication, QWidget, QGridLayout, QLabel, QLineEdit, QSizePolicy

class Ui_Dialog():
    def setupUi(self, Dialog):
        if not Dialog.objectName():
            Dialog.setObjectName(u"Dialog")
        Dialog.resize(400, 300)
        self.gridLayoutWidget = QWidget(Dialog)
        self.gridLayoutWidget.setObjectName(u"gridLayoutWidget")
        self.gridLayoutWidget.setGeometry(QRect(10, 20, 341, 191))
        self.gridLayout = QGridLayout(self.gridLayoutWidget)
        self.gridLayout.setObjectName(u"gridLayout")
        self.gridLayout.setContentsMargins(0, 0, 0, 0)
        self.label = QLabel(self.gridLayoutWidget)
        self.label.setObjectName(u"label")

        self.gridLayout.addWidget(self.label, 0, 0, 1, 1)

        self.label_2 = QLabel(self.gridLayoutWidget)
        self.label_2.setObjectName(u"label_2")

        self.gridLayout.addWidget(self.label_2, 1, 0, 1, 1)

        self.lineEdit = QLineEdit(self.gridLayoutWidget)
        self.lineEdit.setObjectName(u"lineEdit")
        sizePolicy = QSizePolicy(QSizePolicy.Expanding, QSizePolicy.Expanding)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(self.lineEdit.sizePolicy().hasHeightForWidth())
        self.lineEdit.setSizePolicy(sizePolicy)

        self.gridLayout.addWidget(self.lineEdit, 0, 1, 1, 1)

        self.lineEdit_2 = QLineEdit(self.gridLayoutWidget)
        self.lineEdit_2.setObjectName(u"lineEdit_2")
        sizePolicy.setHeightForWidth(self.lineEdit_2.sizePolicy().hasHeightForWidth())
        self.lineEdit_2.setSizePolicy(sizePolicy)

        self.gridLayout.addWidget(self.lineEdit_2, 1, 1, 1, 1)

        self.gridLayout.setColumnStretch(1, 1)

        self.retranslateUi(Dialog)

        QMetaObject.connectSlotsByName(Dialog)

    def retranslateUi(self, Dialog):
        Dialog.setWindowTitle(QCoreApplication.translate("Dialog", u"Dialog", None))
        self.label.setText(QCoreApplication.translate("Dialog", u"TextLabel", None))
        self.label_2.setText(QCoreApplication.translate("Dialog", u"TextLabel", None))

class MyMainWindow(QWidget, Ui_Dialog):
    def __init__(self, *args, obj=None, **kwargs):
        super().__init__(*args, **kwargs)
        self.setupUi(self)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    w = MyMainWindow()
    w.show()
    app.exec()

文件上说
QGridLayout获取为其提供的空间（通过其父布局或parentWidget（）），...
因此，我认为问题可以归结为"如何告诉QDialog或QMainWindow将其所有空间都提供给一个QLayout？