What place in the system would you choose for storing user settings?

To store user settings in iOS, UserDefaults is commonly used. It is a convenient and simple way to save small data such as app settings, user preferences, and flags.

UserDefaults stores data as key-value pairs and automatically saves them between app launches.

Example of writing and reading a value:

// Saving a value
UserDefaults.standard.set(true, forKey: "darkModeEnabled")

// Reading a value
let isDarkMode = UserDefaults.standard.bool(forKey: "darkModeEnabled")

If the settings are more complex or require security, consider storing them in files, a Core Data database, or Keychain (for sensitive data). But for most user settings, UserDefaults is an optimal choice.