def translate_poco_step(self, step):
        """
        处理poco的相关操作，参数与airtest的不同，由一个截图和一个操作构成，需要合成一个步骤
        Parameters
        ----------
        step 一个完整的操作，如click
        prev_step 前一个步骤，应该是截图

        Returns
        -------

        """
        ret = {}
        prev_step = self._steps[-1]
        if prev_step:
            ret.update(prev_step)
        ret['type'] = step[1].get("name", "")
        if step.get('trace'):
            ret['trace'] = step['trace']
            ret['traceback'] = step.get('traceback')
        if ret['type'] == 'touch':
            # 取出点击位置
            if step[1]['args'] and len(step[1]['args'][0]) == 2:
                pos = step[1]['args'][0]
                ret['target_pos'] = [int(pos[0]), int(pos[1])]
                ret['top'] = ret['target_pos'][1]
                ret['left'] = ret['target_pos'][0]
        elif ret['type'] == 'swipe':
            if step[1]['args'] and len(step[1]['args'][0]) == 2:
                pos = step[1]['args'][0]
                ret['target_pos'] = [int(pos[0]), int(pos[1])]
                ret['top'] = ret['target_pos'][1]
                ret['left'] = ret['target_pos'][0]
            # swipe 需要显示一个方向
            vector = step[1]["kwargs"].get("vector")
            if vector:
                ret['swipe'] = self.dis_vector(vector)
                ret['vector'] = vector

        ret['desc'] = self.func_desc_poco(ret)
        ret['title'] = self._translate_title(ret)
        return ret