First I show my `cell` , my label has several `constaints`:

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[![constrains](https://i.stack.imgur.com/LsWJd.png)](https://i.stack.imgur.com/LsWJd.png)

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In my `- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath` method.

I get the `label`'s constrains :

`NSArray *cons = (((NoticeAnnouncementCell*)cell).mainTitle).constraints;`

but I get a empty array.