How to create a singleton in Swift

The following tutorial builds on our starter project and covers the creation of a singleton through the example of a LanguageCoordinator.

If you are looking for the specific code, please jump to Step Four.

We recommend that you create a folder for your singleton and all associated functionality.

Select your folder and press Command + N to create a file and press next.

Please note that this assumes that a Swift file is auto selected.

Name your singleton and press Create.

Code your class and functionality.

To make it a singleton, add the following line - which makes the singleton accessible via the .shared parameter - i.e. LanguageCoordinator.shared. You can call this whatever you like, i.e. singleton would be accessed by LanguageCoordinator.singleton.

Alternatively, copy and add to the gist below.

Call a function or variable within your singleton within a part of your app to verify that it's been setup correctly.

In our example we call the LanguageCoordinator singleton initialize function from the ViewController on ViewDidLoad.

Here's a range of resources that might interest you.

We are actively looking for feedback on how to improve this resource. Please send us a note to inquiries@delasign.com with any thoughts or feedback you may have.