What methods and approaches exist for storing data objects?

The following methods and approaches are used for saving data objects in iOS:

• UserDefaults — for storing small settings and simple data (strings, numbers, boolean values).
• Keychain — for securely storing confidential data, such as passwords.
• File system — saving data to files (e.g., JSON, plist, binary files).
• Core Data — a framework for managing object models and storing data in an SQLite database with complex query capabilities.
• Realm — a third-party database, convenient for storing objects with synchronization.

Example of saving a string in UserDefaults:

UserDefaults.standard.set("value", forKey: "key")

The choice of method depends on the volume, data structure, and security requirements.