Defaults – Swifty and modern UserDefaults

Store key-value pairs persistently across launches of your app.

It uses NSUserDefaults underneath but exposes a type-safe facade with lots of nice conveniences.

It’s used in production by apps like Gifski, Dato, Lungo, Battery Indicator, and HEIC Converter.

For a real-world example, see the Plash app.

Defaults Highlights

Strongly typed: You declare the type and default value upfront.
Codable support: You can store any Codable value, like an enum.
NSSecureCoding support: You can store any NSSecureCoding value.
SwiftUI: Property wrapper that updates the view when the UserDefaults value changes.
Publishers: Combine publishers built-in.
Observation: Observe changes to keys.
Debuggable: The data is stored as JSON-serialized values.
Customizable: You can serialize and deserialize your own type in your own way.

You define strongly-typed identifiers in a single place and can use them everywhere.
You also define the default values in a single place instead of having to remember what default value you used in other places.
You can use it outside of SwiftUI.
Comes with Combine publisher.
Supports many more types, even Codable.
Easy to add support for your own custom types.
Comes with a convenience SwiftUI Toggle component.

Defaults on GitHub: https://github.com/sindresorhus/Defaults
Platform: iOS
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