Swifty and modern UserDefaults

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

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

It's used in production by all my apps (4 million+ users).

• Strongly typed: You declare the type and default value upfront.
• SwiftUI: Property wrapper that updates the view when the UserDefaults value changes.
• Codable support: You can store any Codable value, like an enum.
• NSSecureCoding support: You can store any NSSecureCoding value.
• 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.
• iCloud support: Automatically synchronize data between devices.

• 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.
• You can observe value updates.
• Supports many more types, even Codable.
• Easy to add support for your own custom types.
• Comes with a convenience SwiftUI Toggle component.

• macOS 11+
• iOS 14+
• tvOS 14+
• watchOS 9+
• visionOS 1+

Add https://github.com/sindresorhus/Defaults in the “Swift Package Manager” tab in Xcode.

Full documentation

import Defaults

extension Defaults.Keys {
	static let quality = Key<Double>("quality", default: 0.8)
}

Defaults[.quality]
//=> 0.8

Defaults[.quality] = 0.5
//=> 0.5

You can also use it in SwiftUI:

struct ContentView: View {
	@Default(.quality) var quality

	var body: some View {
		Slider(value: $quality, in: 0...1)
	}
}

• Sindre Sorhus
• @hank121314

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