A Short Note – How To Perform One-Time Setup For iOS App ?

Hello Readers, CoolMonkTechie heartily welcomes you in A Short Note Series.

In this note series, we will learn about how to perform one-time setup for iOS application. We will discuss how to ensure proper configuration of our app environment.

How To Perform One-Time Setup For iOS App ?

So Let’s begin.


When the user launches our app for the first time, we might want to prepare our app environment by performing some one-time tasks. For example, we might want to:

  • Download required data from our server.
  • Copy document templates or modifiable data files from our app bundle to a writable directory.
  • Configure default preferences for the user.
  • Set up user accounts or gather other required data.

Perform any one-time tasks in our app delegate’s application(_:willFinishLaunchingWithOptions:) or application(_:didFinishLaunchingWithOptions:) method. Never block the app’s main thread for tasks that do not require user input. Instead, start tasks asynchronously using a dispatch queue, and let them run in the background while our app finishes launching. For tasks that require user input, make all changes to our user interface in the application(_:didFinishLaunchingWithOptions:) method.

Install Files in the Proper Locations

Our app has its own container directory for storing files, and we should always place app-specific files in the ~/Library subdirectory. Specifically, store our files in the following ~/Library subdirectories:

  • ~/Library/Application Support/—Store app-specific files that we want backed up with the user’s other content. (We can create custom subdirectories here as needed.) Use this directory for data files, configuration files, document templates, and so on.
  • ~/Library/Caches/—Store temporary data files that can be easily regenerated or downloaded.

To obtain a URL for one of the directories in our app’s container, use the urls(for:in:) method of FileManager.

let appSupportURL = FileManager.default.urls(for: 
      .applicationSupportDirectory, in: .userDomainMask)

let cachesURL = FileManager.default.urls(for: 
      .cachesDirectory, in: .userDomainMask)

Place any temporary files in our app’s tmp/ directory. Temporary files might include compressed files that we intend to delete once their contents have been extracted and installed elsewhere. Retrieve the URL for our app’s temporary directory using the temporaryDirectory method of FileManager.


In this note series, We understood how to perform one-time setup for iOS application. We also discussed how to ensure proper configuration of our app environment.

Thanks for reading ! I hope you enjoyed and learned about Proper App Environment Configuration concepts in iOS. Reading is one thing, but the only way to master it is to do it yourself.

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If you have any comments, questions, or think I missed something, feel free to leave them below in the comment box.

Thanks again Reading. HAPPY READING !!😊😊😊

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