![]() Other types of data can be archived using NSData, then read from or written to the User Defaults Database. ![]() The NSUserDefaults class contains several convenience methods for reading and writing preference values for common data types such as: string, integer, float, boolean and URLs. Instead, it will be automatically called at periodic intervals to keep the in-memory cache in sync with a user’s defaults database. When your app first executes, NSUserDefaults reads the keys and values from the app's User Defaults Database and caches them to memory to avoid opening and reading the database each time a value is required.Īpple no longer recommends that the developer call the Synchronize method to sync the in-memory cache with the database directly. When used with App Groups, NSUserDefaults also provides a way to communicate between apps (or Extensions) within a given group.Īs stated above, User Defaults ( NSUserDefaults) can be added to an App (or Extension) and used to provide configurable options that the end user can modify to adjust the look or operation of the app at runtime. For example, to present data in Metric vs Imperial measurements or select a given UI Theme. By using the Defaults System, the user can configure an app's behavior or styling to meet their preferences (based on the design of the app). The NSUserDefaults class provides a way for iOS Apps and Extensions to programmatically interact with the system-wide Defaults System. This article covers working with NSUserDefault to save default settings in a Xamarin.iOS App or Extension.
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