尺寸策略

尺寸策略（sizePolicy）

sizeHint(期望尺寸)

對於大多數控件來說，sizehint的值是隻讀的

讀取期望尺寸sizeHint

self.pushButton.sizeHint().width()
self.pushButton.sizeHint().height()

最小期望尺寸miniumSizeHint

self.pushButton.miniumSizeHint().width()
self.pushButton.miniumSizeHint().height()

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow
import sizePolicy

if __name__ == '__main__':
    app = QApplication(sys.argv)
    mainWindow = QMainWindow()
    ui = sizePolicy.Ui_MainWindow()
    ui.setupUi(mainWindow)
    mainWindow.show()
    sys.exit(app.exec_())