I have a TableView inside my View Controller and inside my TableView, I have a Custom UTableView Cell. I want to have a label one-third or my custom tableview cell, but when I drag by right clicking on my label to the content view (Of my cell) to select aspect ratio, I don't get the aspect ratio option. Can anyone please help me to figure out ho to make my label to be one-third of my tableview cell. 

I set the constrain for trailing space and top space to container.
![enter image description here](https://i.stack.imgur.com/TzTCf.png)

Now, when I go to find the aspect ratio, I don't get any.

![enter image description here](https://i.stack.imgur.com/iidsP.png)