KeyValueStorage - A key-value storage module for Swift projects

This module is an ultra-light wrapper for key-value storage frameworks like:

• Keychain
• User Defaults
• Memory (Dictionary)

It is very easy to use, like the Keychain, for instance:

import KeyValueStorage
let myKey = KeyValueStorageKey(type: .keychain, value: "myKey")
let storage: KeyValueStorageProtocol = KeyValueStorage()
storage.set(value: "something awesome!", for: myKey)
let value: String? = storage.get(key: myKey)
print(value)

Nice, right? What about the others? Well, you can easily create a key for any of the storage types:

let keychainKey = KeyValueStorageKey(type: .keychain, value: "myKey")
let defaultsKey = KeyValueStorageKey(type: .defaults, value: "myKey")
let memoryKey = KeyValueStorageKey(type: .memory, value: "myKey")

Why?

You might be asking why another framework for this kind of feature? It's because all the storage frameworks are together? No, not only for that. Actually, this framework has a bigger purpose, it is completely based on the KeyValueStorageProtocol which provides testability for your app. The way to do it is using the protocol on parameters and properties so you could inject dependencies for different behaviours. You can use the one in the package or implement a mock to avoid some issues on the tests, for instance.

Setup

CocoaPods

If you are using CocoaPods, add this to your Podfile and run pod install.

target 'Your target name' do
    pod 'KeyValueStorage', '~> 2.0'
end

Manual Installation

If you want to add it manually to your project, without a package manager, just copy all files from the Classes folder to your project.

Usage

Add import KeyValueStorage to your source code.

Store values

The KeyValueStorageProtocol supports any kind of Codable values, so you can use them as you want to store data into any of the storage types:

storage.set(value: 10, for: myKey)
let intValue: Int? = storage.get(key: myKey)

storage.set(value: "abc", for: myKey)
let stringValue: String? = storage.get(key: myKey)

Removing keys from the storage

storage.remove(key: myKey) // Removes a single key
storage.clean(type: .memory) // Removes all keys from the given storage type
storage.cleanAll() // Removes all keys from all storage types

KeyValueStorageKey

To create keys, we use this special object called KeyValueStorageKey. As you can see, it is very simple:

public struct KeyValueStorageKey: Equatable, Hashable {
    
    // MARK: - Properties
    
    public let type: KeyValueStorageType
    public let value: String
    
    // MARK: - Initialization
    
    public init(type: KeyValueStorageType, value: String) {
        self.type = type
        self.value = value
    }
}

You can extend it with your own keys to use the storage without hardcoded strings everywhere. You just need to add a static property in an extension of the KeyValueStorageKey and then use it with autocomplete:

extension KeyValueStorageKey {
	static let myKey = KeyValueStorageKey(type: .memory, value: "myKey")
}

storage.set(value: "abcde", for: .myKey)
let value: String? = storage.get(key: .myKey)

This is how we can safely reuse keys throughout the app and it is even better in local frameworks because you can create internal extensions for each one.

Thanks 👍

The creation of this framework was possible thanks to these awesome people:

• Gray Company: https://www.graycompany.com.br/
• Swift by Sundell: https://www.swiftbysundell.com/
• Hacking with Swift: https://www.hackingwithswift.com/
• KeychainSwift: https://github.com/evgenyneu/keychain-swift
• Ricardo Rauber: http://ricardorauber.com/

Feedback is welcome

If you notice any issue, got stuck or just want to chat feel free to create an issue. We will be happy to help you.

License

KeyValueStorage is released under the MIT License.