A Turkish version of this document can be found here.

tl;dr

You love Swift's Codable protocol and use it everywhere, who doesn't! Here is an easy and very light way to store and retrieve -reasonable amount 😅- of Codable objects, in a couple lines of code!

Installation

pod 'UserDefaultsStore'

github "omaralbeik/UserDefaultsStore" ~> 1.0

import PackageDescription

let package = Package(
    name: "YOUR_PROJECT_NAME",
    targets: [],
    dependencies: [
        .package(url: "https://github.com/omaralbeik/UserDefaultsStore.git", from: "1.4.2")
    ]
)

.target(
    name: "YOUR_TARGET_NAME",
    dependencies: [
        "UserDefaultsStore",
    ]
),

Usage

Let's say you have 2 structs; User and Laptop defined as bellow:

struct User: Codable {
    var id: Int
    var firstName: String
    var lastName: String
    var laptop: Laptop?
}

struct Laptop: Codable {
    var model: String
    var name: String
}

Here is how you store them in UserDefaultsStore:

1. Conform to the Identifiable protocol and set the idKey property

The Identifiable protocol lets UserDefaultsStore knows what is the unique id for each object.

struct User: Codable, Identifiable {
    static let idKey = \User.id
    ...
}

struct Laptop: Codable, Identifiable {
    static let idKey = \Laptop.model
    ...
}

Notice how User uses Int for its id, while Laptop uses String, in fact the id can be any Hashable type. UserDefaults uses Swift keypaths to refer to properties without actually invoking them. Swift rocks 🤘

2. Create UserDefaults Stores

let usersStore = UserDefaultsStore<User>(uniqueIdentifier: "users")!
let laptopsStore = UserDefaultsStore<Laptop>(uniqueIdentifier: "laptops")!

3. Voilà, you're all set!

let macbook = Laptop(model: "A1278", name: "MacBook Pro")
let john = User(userId: 1, firstName: "John", lastName: "Appleseed", laptop: macbook)

// Save an object to a store
try! usersStore.save(john)

// Save an array of objects to a store
try! usersStore.save([jane, steve, jessica])

// Get an object from store
let user = store.object(withId: 1)
let laptop = store.object(withId: "A1278")

// Get all objects in a store
let laptops = laptopsStore.allObjects()

// Check if store has an object
print(usersStore.hasObject(withId: 10)) // false

// Iterate over all objects in a store
laptopsStore.forEach { laptop in
    print(laptop.name)
}

// Delete an object from a store
usersStore.delete(withId: 1)

// Delete all objects in a store
laptops.deleteAll()

// Know how many objects are stored in a store
let usersCount = usersStore.objectsCount

Looking to store a single item only?

Use SingleUserDefaultsStore, it enables storing and retrieving a single value of Int, Double, String, or any Codable type.

Note about using class instead of struct

At the moment, only final classes are supported, please take this into consideration before using the library.

Requirements

• iOS 8.0+ / macOS 10.10+ / tvOS 9.0+ / watchOS 2.0+
• Xcode 10.0+
• Swift 4.2+

Thanks

Special thanks to:

• Paul Hudson for his article on how to use Swift keypaths to write more natural code.
• Batuhan Saka for translating this document into Turkish.

Credits

Icon made by freepik from flaticon.com.

License

UserDefaultsStore is released under the MIT license. See LICENSE for more information.