在QGridLayout for pyQt5中控制QScrollArea中多行QLabel的高度？

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QScrollArea, QLabel, QGridLayout

class MainWindow(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        scroll_area = QScrollArea(self)
        widget = QWidget()
        grid_layout = QGridLayout(widget)

        # 创建多个QLabel并添加到QGridLayout中
        label1 = QLabel("Label 1")
        label2 = QLabel("Label 2")
        label3 = QLabel("Label 3")
        label4 = QLabel("Label 4")

        grid_layout.addWidget(label1, 0, 0)
        grid_layout.addWidget(label2, 1, 0)
        grid_layout.addWidget(label3, 2, 0)
        grid_layout.addWidget(label4, 3, 0)

        # 设置QLabel的最小高度和最大高度
        label1.setMinimumHeight(50)
        label1.setMaximumHeight(100)
        label2.setMinimumHeight(100)
        label2.setMaximumHeight(150)
        label3.setMinimumHeight(150)
        label3.setMaximumHeight(200)
        label4.setMinimumHeight(200)
        label4.setMaximumHeight(250)

        widget.setLayout(grid_layout)
        scroll_area.setWidget(widget)

        # 将QScrollArea添加到父级窗口的布局中
        layout = QGridLayout(self)
        layout.addWidget(scroll_area)
        self.setLayout(layout)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = MainWindow()
    window.show()
    sys.exit(app.exec_())