![]() ![]() Since this is something that users can select themselves, it makes a lot of sense to treat it as a user preference, and to store its value in UserDefaults. Let’s start by taking a look at an example, in which we’re building a ThemeController that’ll be responsible for keeping track of the current Theme that our app will use to render its UI. While it’s true that the user defaults API is able to act as a database, its main use case is more centered around values that relate to user preferences - which, when looking more closely at the its various functionality and how it integrates with the system, makes it look much less like a limited database - and more like a focused API that does a core set of things really well. Core Data: Core Data is a framework provided by Apple for managing the. This includes reading and writing files in various formats such as text files, JSON, or custom binary formats. JSON: You can save data directly to the file system using APIs provided by Foundation framework. Very often UserDefaults is positioned as an alternative to a database solution - such as CoreData or SQLite. It uses the UserDefaults class to store data in key-value pairs. App settings, like user interface language, app color theme or font. These are several example pieces of data that are saved in UserDefaults: User information, like name, email address, age, occupation. If you need to store multiple objects, you better use the real database. This week, let’s take a look at what some of that power comes from, and how we can appropriately make use of it in the apps that we build. The user defaults are best used for simple pieces of data. However, appearances can be deceiving, and it turns out that the power of UserDefaults extends far beyond simply storing and loading basic value types. While it provides an easy-to-use way to save and store persisted values, the way it stores those values in a single plist file can make it impractical for larger datasets - resulting in many developers dismissing it in favor of more full-featured databases, or some form of custom solution. ![]() Available since the very first release of the iOS SDK, the UserDefaults API can at first glance appear to be both really simple and somewhat limited.
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