ios - How to allow only one cell to be clickable -

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I am trying to add a tick next to a user selection, to indicate that the user has a special Place is guessed at.

Currently, my argument allows all the cells to be clicked as seen below;

Enter the image details here

I have at one time How can I restrict the user to enable only one selection? I was thinking of a variable (to say) to track the currently selected - in this way I can tick the right places. However, I want to know

1) This is the best way to do this and

2) How can I deselect the previously selected cell?

Thanks

Do I need a class variable to see if it has been fixed, if so, log in something

You can easily use: 

  tableView.allowsMultipleSelection = false

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