current view from the navigatoin stack
UITableViewCell *cell= [tableView cellForRowAtIndexPath:indexPath];
//Thisif statment is based off which cell was
有条件地评估代码块和及其相关的标题是否可以使用R和knitr?例如,如果eval_cell是TRUE,则包括块和它的标题,但如果eval_cell是FALSE,则不包括。```{r}# Heading (would like to eval only if eval_cell is TRUE)
```{r eval = eval_cell}