UBLocalNetworking can provide mocks and intercepts requests at runtime in any iOS or MacOS application.


Swift Package Manager

Swift Package Manager is a tool for managing the distribution of Swift code. It’s integrated with the Swift build system to automate the process of downloading, compiling, and linking dependencies.

Xcode 11+ is required to build UBLocalServer using Swift Package Manager.

To integrate UBLocalServer into your Xcode project using Swift Package Manager, add it to the dependencies value of your Package.swift:

dependencies: [
    .package(url: "", .upToNextMajor(from: "1.0.0"))


If you prefer not to use either of the aforementioned dependency managers, you can integrate UBLocalServer into your project manually.


Quick Start

import UBLocalNetworking

class MyViewController: UIViewController {

    override func viewDidLoad() {

        // Start the server

        // The object that you wish to send
        let jhon = Person(name: "Jhon", age: 31)
        // Create a basic response provider that intercepts URLs containing persons
        // You can use here any Regex that you like
        let responseProvider = try! BasicResponseProvider(rule: #"https://.*/persons/.*"#, encodable: jhon)

        // Add the provider to the local server

        // All set now you can issue any URLSessionDataTask and it will get your object back
        _ = URLSession.shared.dataTask(with: URL(string: "")!)


Pausing and Cleanup

You can at any time pause the server so that requests go through the normal flow.

import UBLocalNetworking

class MyViewController: UIViewController {
    override func viewWillDisappear() {


Alternatively if you wish to remove a response provider that you don’t need anymore, you can call LocalServer.remove(responseProvider: ResponseProvider) or to remove all providers LocalServer.removeAllResponseProviders()

Cusomization and Features

All the power of customization lies in the ResponseProvider protocol. This is an asynchronous interface allowing you to fully cusomize the response to your networking layer. It relies on 3 async function to determin if it can handle a request, and to fulfill the request’s response.

You do not need to always implement a custom ResponseProvider, sometimes the provided BasicResponseProvider can fit your needs.


The BasicResponseProvider can return custom JSON from Encodable objects, errors on load, empty responses with only a header…

It is also by itself a customizable object as it relies on protocols to fulfill it’s header and body response, also does Regex matching for determining if it can handle a URL.

Also the BasicResponseProvider can provide delays to simulate real networks, to test loading screens or timout errors. Use the Timing object in any initializer to control the delays


The package is fully documented. The documentation can be build and consulted using Xcode’s build documentation action under the Product Tab.

Issues and Contribution

Please use github Issues to submit bugs or requests. Regarding further contributions, please submit a pull request after forking the repo.


UBLocalServer is released under the MIT license. See LICENSE for details.


View Github