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A Swift SignalR Client for the Asp.Net Core version of SignalR

Before filing an issue please check Frequently Asked Questions



Add the following lines to your Podfile:

pod 'SwiftSignalRClient'

Then run:

pod install

Swift Package Manager

Add the following to your Package dependencies:

.package(url: "", .upToNextMinor(from: "0.6.0")),

Then include "SignalRClient" in your target dependencies. For example:

.target(name: "MySwiftPackage", dependencies: ["SignalRClient"]),


Add the following lines to your Cartfile:

github "moozzyk/SignalR-Client-Swift"

Then run:

carthage update


Add import SwiftSignalRClient (or import SignalRClient if you are using Swift Package Manager) to swift files you would like to use the client in.

A typical implementation looks like the following:

import Foundation
import SwiftSignalRClient

public class SignalRService {
    private var connection: HubConnection
    public init(url: URL) {
        connection = HubConnectionBuilder(url: url).withLogging(minLogLevel: .error).build()
        connection.on(method: "MessageReceived", callback: { (user: String, message: String) in
            do {
                self.handleMessage(message, from: user)
            } catch {
    private func handleMessage(_ message: String, from user: String) {
        // Do something with the message.

More detailed user's guide:


There are several sample projects in the Examples folder. They include:

  • SignalRClient.xcworkspace

    An Xcode workspace that has compiled libraries for macOS (OSX) and iOS, along with the Application targets 'ConnectionSample', 'HubSample', and 'HubSamplePhone'.

  • TestServer

    A .Net solution that the unit tests and samples can be run against.

    The TestServer Requires .NET Core SDK 3.0.100 or later.

    To run, navigate to the TestServer folder and execute the following in the terminal:

    npm install
    dotnet run

Migration from versions before 0.6.0

The way of handling serialization/deserialization of values sent/received from the server changed in version 0.6.0. The TypeConverter protocol has been removed in favor of the Encodable/Decodable protocols. The client now can serialize and send to the server any value that conforms to the Encodable protocol and is able to deserialize any value received from the server as long as the target type for the value conforms to the Decodable protocol (in most cases you don't need to distinguish between these protocols and you can just make your types conform to the Codable protocol. Also primitive types already conform to the Codable protocol so they work out of the box). One of the consequences of this change is that the signature of the client side method handlers changed and the code needs to be adjusted when moving to the version 0.6.0. Here is how:

Before version 0.6.0 registering a handler for the client side method could look like this:

self.chatHubConnection!.on(method: "NewMessage", callback: {args, typeConverter in
    let user = try! typeConverter.convertFromWireType(obj: args[0], targetType: String.self)
    let message = try! typeConverter.convertFromWireType(obj: args[1], targetType: String.self)
    self.appendMessage(message: "\(user!): \(message!)")

After installing version 0.6.0 or newer it needs to be changed to:

self.chatHubConnection!.on(method: "NewMessage", callback: {(user: String, message: String) in
    self.appendMessage(message: "\(user): \(message)")

Here is the summary of the changes:

  • remove the typeConverter parameter
  • replace args parameter with a list of actual parameters (make sure to provide parameter types)
  • remove calls to typeConverter methods
  • remove code to handle optional types (if applicabale)

Note: if your client side method takes more than 8 parameters you will need to use a lower level primitve to add a handler for this method.

Version 0.6.0 also adds some syntactic sugar for the APIs to invoke server side hub methods (i.e. invoke, send, stream). This is not a breaking change - the old methods will continue to work but in version 0.6.0 you can now pass the values as separate arguments instead of creating an array which is much nicer. For instance nvoking a hub method:

chatHubConnection?.invoke(method: "Broadcast", arguments: [name, message]) { error in
    if let e = error {
        self.appendMessage(message: "Error: \(e)")

can now be changed to:

chatHubConnection?.invoke(method: "Broadcast", name, message) { error in
    if let e = error {
        self.appendMessage(message: "Error: \(e)")

The new APIs support up to 8 parameters. If you have a hub method taking more than 8 parameters you will need to use a lower level primitives that take an array containing parameter values.


I am providing code in the repository to you under an open source license. Because this is my personal repository, the license you receive to my code is from me and not my employer (Facebook)



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