How to use the uiautomator2.session.UiObject function in uiautomator2

def __view_beside(self, onsideof, **kwargs):
        bounds = self.info["bounds"]
        min_dist, found = -1, None
        for ui in UiObject(self.session, Selector(**kwargs)):
            dist = onsideof(bounds, ui.info["bounds"])
            if dist >= 0 and (min_dist < 0 or dist < min_dist):
                min_dist, found = dist, ui
        return found

def __call__(self, **kwargs):
        return UiObject(self, Selector(**kwargs))

def child_by_description(self, txt, **kwargs):
        # need test
        if "allow_scroll_search" in kwargs:
            allow_scroll_search = kwargs.pop("allow_scroll_search")
            name = self.jsonrpc.childByDescription(self.selector,
                                                   Selector(**kwargs), txt,
                                                   allow_scroll_search)
        else:
            name = self.jsonrpc.childByDescription(self.selector,
                                                   Selector(**kwargs), txt)
        return UiObject(self.session, name)

def child_by_text(self, txt, **kwargs):
        if "allow_scroll_search" in kwargs:
            allow_scroll_search = kwargs.pop("allow_scroll_search")
            name = self.jsonrpc.childByText(self.selector, Selector(**kwargs),
                                            txt, allow_scroll_search)
        else:
            name = self.jsonrpc.childByText(self.selector, Selector(**kwargs),
                                            txt)
        return UiObject(self.session, name)

def __getitem__(self, index):
        """
        Raises:
            IndexError
        """
        if isinstance(self.selector, six.string_types):
            raise IndexError(
                "Index is not supported when UiObject returned by child_by_xxx"
            )
        selector = self.selector.clone()
        selector.update_instance(index)
        return UiObject(self.session, selector)

def child(self, **kwargs):
        return UiObject(self.session, self.selector.clone().child(**kwargs))