class MyWidget(QWidget):

    window = ...  # type: QObject

    def __init__(self, ui_file, parent=None):
        super(MyWidget, self).__init__(parent)
        ui_file = QFile(ui_file)
        ui_file.open(QFile.ReadOnly)

        loader = QUiLoader()
        self.window = loader.load(ui_file)

        ui_file.close()
        # all_click_btn = self.window.findChild(QCheckBox, 'all_click')
        # all_click_btn.clicked.connect(self.all_click_handler)

        # log 控件設定
        self.edit = self.window.findChild(QTextEdit, 'out_log')
        self.out = None

        self.window.show()