Extensions for SwiftNIO to support Apple platforms as first-class citizens.

What's New

SwiftNIO Transport Services 1.21.0


SemVer Minor

  • Raise minimum Swift version to 5.8 (#199)
  • Add ChannelOptions to extract base types. (#203)

SemVer Patch

  • Fix the syncOptions on most channels (#202)

NIO Transport Services

Extensions for SwiftNIO to support Apple platforms as first-class citizens.

About NIO Transport Services

NIO Transport Services is an extension to SwiftNIO that provides first-class support for Apple platforms by using Network.framework to provide network connectivity, and Dispatch to provide concurrency. NIOTS provides an alternative EventLoop, EventLoopGroup, and several alternative Channels and Bootstraps.

In addition to providing first-class support for Apple platforms, NIO Transport Services takes advantage of the richer API of Network.framework to provide more insight into the behaviour of the network than is normally available to NIO applications. This includes the ability to wait for connectivity until a network route is available, as well as all of the extra proxy and VPN support that is built directly into Network.framework.

All regular NIO applications should work just fine with NIO Transport Services, simply by changing the event loops and bootstraps in use.

Why Transport Services?

Network.framework is Apple's reference implementation of the proposed post-sockets API that is currently being worked on by the Transport Services Working Group (taps) of the IETF. To indicate the proposed long-term future of interfaces like Network.framework, we decided to call this module NIOTransportServices. Also, NIONetworkFramework didn't appeal to us much as a name.

How to Use?

NIO Transport Services primarily uses SwiftPM as its build tool, so we recommend using that as well. If you want to depend on NIO Transport Services in your own project, it's as simple as adding a dependencies clause to your Package.swift:

dependencies: [
    .package(url: "https://github.com/apple/swift-nio-transport-services.git", from: "1.13.0")

and then adding the NIOTransportServices module to your target dependencies.

If your project is set up as an Xcode project and you're using Xcode 11+, you can add NIO Transport Services as a dependency to your Xcode project by clicking File -> Swift Packages -> Add Package Dependency. In the upcoming dialog, please enter https://github.com/apple/swift-nio-transport-services.git and click Next twice. Finally, make sure NIOTransportServices is selected and click finish. Now will be able to import NIOTransportServices in your project.

Supported Platforms

NIOTransportServices is supported where Network.framework is supported: macOS 10.14+, iOS 12+, tvOS 12+, and watchOS 6+.

In order to allow dependencies to use NIOTransportServices when it's available and fallback to NIO when it isn't, all code is behind import guards checking the availability of Network.framework. As such NIOTransportServices may be built on platforms where Network.framework is not available. NIOTransportServices can be built on macOS 10.12+, iOS 10+, tvOS 10+, watchOS 6+ and Linux but is only functionally useful on macOS 10.14+, iOS 12+, tvOS 12+ and watchOS 6+.


Just like the rest of the SwiftNIO family, swift-nio-transport-services follows SemVer 2.0.0 with a separate document declaring SwiftNIO's Public API.

swift-nio-transport-services 1.x

swift-nio-transport-services versions 1.x is part of the SwiftNIO 2 family of repositories and does not have any dependencies besides swift-nio, Swift 5.7, and an Apple OS supporting Network.framework. As the latest version, it lives on the main branch.

To depend on swift-nio-transport-services , put the following in the dependencies of your Package.swift:

.package(url: "https://github.com/apple/swift-nio-transport-services.git", from: "1.0.0"),

The most recent versions of SwiftNIO Transport Services support Swift 5.7 and newer. The minimum Swift version supported by SwiftNIO Transport Services releases are detailed below:

SwiftNIO Extras Minimum Swift Version
1.0.0 ..< 1.11.0 5.0
1.11.0 ..< 1.12.0 5.2
1.12.0 ..< 1.15.0 5.4
1.15.0 ..< 1.17.0 5.5.2
1.17.0 ..< 1.19.0 5.6
1.19.0 ..< 1.21.0 5.7
1.21.0 ... 5.8

swift-nio-transport-services 0.x

The legacy swift-nio-transport-services 0.x is part of the SwiftNIO 1 family of repositories and works with Swift 4.1 and newer. The source code can be found on the swift-nio-transport-services-swift-4-maintenance branch.

Developing NIO Transport Services

For the most part, NIO Transport Services development is as straightforward as any other SwiftPM project. With that said, we do have a few processes that are worth understanding before you contribute. For details, please see CONTRIBUTING.md in this repository.

Please note that all work on NIO Transport Services is covered by the SwiftNIO Code of Conduct.


  • Swift Tools 5.8.0
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Last updated: Sun Jul 14 2024 02:34:40 GMT-0900 (Hawaii-Aleutian Daylight Time)