iOS Data Storage

NSData and NSMutableData

• Used for data storage but are also useful for distributed objects applications.
• The following methods are used to write NSData Objects:
  • NSDataWritingWithoutOverwriting
  • NSDataWritingFileProtectionNone
  • NSDataWritingFileProtectionComplete
  • NSDataWritingFileProtectionCompleteUnlessOpen
  • NSDataWritingFileProtectionCompleteUntilFirstUserAuthentication
  • writeToFile: stores data as part of the NSData class
  • NSSearchPathForDirectoriesInDomains, NSTemporaryDirectory: used to manage file paths
  • NSFileManager

Databases

• CoreData
• SQLite
• Firebase Real-Time
• Realm
• Couchbase Lite
• Yap

Keyboard Cache

• Several options, such as autocorrect and spell check, are available to users to simplify keyboard input and are cached by default in .dat files in /private/var/mobile/Library/Keyboard/ and its subdirectories.
  • The UITextInputTraits protocol is used for keyboard caching.