Swift Nifty TableViewCell Trick

Like every Swift developer out there I grew to love TableViewCells and Protocol Oriented Programming. Good because today’s is about a cool trick combining the two !

Let’s see the common way of registering a TableViewCell in Swift :

What bothers me first here is the error-prone string usage, then let’s be honest, 99% of the time, the cell identifier is just the string Cell class name. Maybe some of you see where I’m going with this :)

As always in Swift, start with a protocol :

Then make your cell “Reusable” by implementing the protocol like so :

And here instead of implementing it, we are going to use Swift’s Protocol Extensions to provide a default value for all reusable objects !

By default reuseIdentifier will be the name of the class !

So you can now write :

Okay we got rid of the error prone String, but wait we can do better than that can’t we?

Bonus

Surething! Let’s provide a shorter way to register Reusable cells.

Once again, protocols to the rescue!

Here we say, If you are a TableView registering a Reusable TableViewCell, then use cell’s reuseIdentifier by default.

And now you can simply call :

It’s as short as we can get I’m afraid 🎉🎉🎉

Wrap-up

Here we used Swift amazing protocol extensions to remove error-prone string identifier in a very common usage of TableViewCells.

We made the code both shorter and clearer while saving us from writing all of our UITableViewCells reuseIdentifiers by hand !

Remember, the best code is the one you don’t have to write :)

If you liked this trick you will probably love the iOS tools we make @freshos

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