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Common utility extensions for swift in iOS

SwiftExtensions - Robust, Reusable & Secure utilities

This library provides helpful utilities, like IO operations on the local disk, with encryption layer for security. It also provides a convenice Prefs class for storing Key-Value pairs easily and safely with the same encryption layer.


SwiftExtensions is a Swift Package.

Use the swift package manager to install SwiftExtensions on your project. Apple Developer Guide


lots of convenince utility functions


extension ControllerID {
	static let myCtrl = ControllerID(value: "myCTRL") //make sure you have added "myCTRL" in the Storyboard

viewController.push(to: .myCtrl)

//OR with `config` block
viewController.present(.myCtrl) { (vc: MyViewController) in 
	//do any configuration before presenting "myCTRL", for example: settting instance variables

JSON Encoding with Codable protocol

struct MyType: Codable { 

let data = MyType(...).json() //convert to JSON encoded data

let instance: MyType = .from(json: data) //convert back to your type

Asynchronous block

post {
	//run in the main thread

async {
	//run in a background thread

URLRequest builder

let req = URLRequest(url: "https://your.end.point")
	.set(method: .POST) //OR .get, .put, .delete, .patch
	.set(contentType: .json) //OR .xml, .urlEncoded etc.
	.set(body: "some String or Data")

Another example:

let dict = ["title": "Bubu is the king", "message": "I am Groot"]

let req = URLRequest(url: "https://your.end.point")
	.set(method: .PUT)
	.set(contentType: .json)
	.set(body: dict.json()) //allows encodable values


let helloWorld = "helloWorld".localized //provided you have "helloWorld" key in Localizable.strings files"

print(helloWorld) //will automatically use the wanted localization


Convenience Read & Write operations with GCM Encryption

For easy, safe & scalable storage architecture, the FileSystem class gives you the ability to read & write files with GCM encryption, implemented using Apple's CryptoKit Framework.

  • IO (Read/Write) operations are synchronous, for more control over threading.
  • You are are required to use the Filename or Folder structs to state your desired files/folders. best used with extension like so:
extension Filename {
	static let myFile1 = Filename(value: "name1InFileSystem")
	static let myFile2 = Filename(value: "name2InFileSystem")

let data = Data("Bubu is the king".utf8)
do {
	try FileSystem.write(data: data, to: .myFile1)
	let sameData = try FileSystem.read(file: .myFile1)

	print(String(decoding: sameData, as: UTF8.self)) //"Bubu is the king"

	try FileSystem.delete(file: .myFile1)
} catch {
	//Handle errors


when instantiating Filename or Folder you can (and probably should) use obfusctated names, for exmaple: use "--" insated of "secret.info".

Storage Customizations

You are able to change some values in the library.

FileSystem.rootURL: defaults to the documents url of the app, it can change for example to an AppGroup url:

FileSystem.rootURL = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: "your.app.group")

FileSystem.encryptor: controls the underlining SimpleEncryptor that handles cryptographics:

FileSystem.encryptor = SimpleEncryptor(strategy: .gcm)

Prefs - Secure Key-Value pairs in storage.

Insapired after iOS's UserDefaults & Android's SharedPreferences, The Prefs class enables you to manage Key-Value pairs easily and securely using the same encryption layer from Encryptor, also comes with a caching logic for fast & non blocking read/writes operation in memory.

You can either use the Standard instance, which is also using an obfuscated filename, or create your own instances for multiple files, like so:

let standardPrefs = Prefs.standard //the built-in standard instance 

let myPrefs = Prefs(file: .myFile1) //new instance using the Filename struct

You can put values:

let myPrefs.edit() //start editing
	.put(key: .name, "Bubu") //using the static constant '.name'
	.commit() //save your changes in memory & lcoal storage
extension PrefKey {
	static let name = PrefKey(value: "obfuscatedKey") //value should be obfuscated

And you can read them:

if let name = myPrefs.string(key: .name) {
	print("\(name), is the king")

PrefsValue - Wrapped property for SwfitUI.

Wrapping a variable with @PrefsValue allows to manage a single value transparently in the prefs

extension PrefKey {
	static let displayName = PrefKey(value: "someObfuscatedKey")

struct ContentView: View {
	@PrefsValue(key: .displayName) var displayName: String = ""

	var body: some View {...}

Views will re-render when a @PrefsValue changes

Result API - Conveneince extension in URLSession.

Using Swift's "Associated values" the following convenience methods allow you to handle responses easily without the boilerplate like unwrapping data and checking for errors.

You can easily get relevant values from response using a switch statement.

let req: URLRequest = ...
URLSession.shared.dataTask(with: req) { (response: NetResponse<Data, Data>) in
	switch response {
	case .success(let data): //handle success (status 2##) with given data
	case .failure(let statusCode, let data): //handle failure (ex: status 400) with given status+data
	case .error(let error):  //handle given error

You can use the generic overload, to automatically decode the response data.

struct MySuccessType: Codable { 

struct MyFailureType: Codable { 

//in this example we will create an API function
func someApi(completion: @escaping (NetResponse<MySuccessType, MyFailureType>) -> Void)
	let req: URLRequest = ...
	URLSession.shared.dataTask(with: req, completion: completion).resume()

someApi { response in //response is of type: NetResponse<MySuccessType, MyFailureType>
	switch response {
	case .success(let successPayload): //handle success, 'successPayload' is of type MySuccessType.
	case .failure(_, let failurePayload): //handle failure, 'failurePayload' is of type MyFailureType. ignoring the status code
	case .error(let error):  //handle given error.

You can also customize your usage, example with someApi that ignore some results and the associated payload

someApi { response in
	switch response {
	case .success: //handle success, but ignore the payload
	default: //handle either failure or error, ignoring the payload

JsonObject & JsonArray - dynamic JSON structs

Conveniece structs for working with dynamic JSON.

//new JSON example
let json = JsonObject()
	.with(key: "name", value: "Bubu")
	.with(key: "age", value: 10)
do {
	let data: Data = try json.data()
} catch {
	//handle encoding error
//receiving JSON as `Data` from an API

do {
	let json = JsonObject(data: dataFromApi) //given data from API

	if let name = json.string(key: "name"), 
		let age = json.int(key: "age") {
		print("name: \(name), age: \(age)")
} catch {
	//handle decoding error


Apache License 2.0


Stars: 0
Last commit: 5 days ago


CryptoExtensions - 2021-02-21T13:21:18

Introducing a new module "CryptoExtensions", with new CryptoKit extension: AES.CBC

Braking Changes:

  • Renamed Encryptor to SimpleEncryptor
  • SimpleEncryptor is now a class
  • moved SimpleEncryptor to CryptoExtensions module
  • more FileSystem methods are now throwing