SignalR-ObjC is a client library for iOS and Mac OS X. It's built on top of two popular open source libraries AFNetworking and SocketRocket. SignalR-ObjC is intended to be used along side ASP.NET SignalR, a new library for ASP.NET developers that makes it incredibly simple to add real-time functionality to your applications. What is "real-time web" functionality? It's the ability to have your server-side code push content to the connected clients as it happens, in real-time.

Installation

Installation with CocoaPods

CocoaPods is a dependency manager for Objective-C, which automates and simplifies the process of using 3rd-party libraries like SignalR-ObjC in your projects. See the "Getting Started" guide for more information. You can install it with the following command:

$ gem install cocoapods

Podfile

To integrate SignalR-ObjC into your Xcode project using CocoaPods, specify it in your Podfile:

source 'https://github.com/CocoaPods/Specs.git'
platform :ios, '8.0'

pod 'SignalR-ObjC', '~> 2.0'

Then, run the following command:

$ pod install

Overview

Hubs
SRHubConnection
Core
SRConnection
Transports
SRAutoTransport	SRAutoTransport chooses the best supported transport for both client and server. This achieved by falling back to less performant transports. The default transport fallback is: 1. SRWebSocketTransport (if supported by the server) 2. SRServerSentEventsTransport 3. SRLongPollingTransport
SRWebSocketTransport	WebSockets is the only transport that establishes a true persistent, two-way connection between the client and server.
SRServerSentEventsTransport	With Server Sent Events, also known as EventSource, it's possible for a server to send new data to a client at any time, by pushing messages to the client. Server Sent Events requires few new connections then Long Polling and therefore will have less latency.
SRLongPollingTransport	Long polling does not create a persistent connection, but instead polls the server with a request that stays open until the server responds, at which point the connection closes, and a new connection is requested immediately. This may introduce some latency while the connection resets.

Example Usage

Persistent Connection

using System.Threading.Tasks;
using Microsoft.AspNet.SignalR;

//Server
public class MyConnection : PersistentConnection 
{
    protected override Task OnReceived(IRequest request, string connectionId, string data) 
    {
        // Broadcast data to all clients
        return Connection.Broadcast(data);
    }
}

#import "SignalR.h"

//Client
SRConnection *connection = [SRConnection connectionWithURLString:@"http://localhost/mysite/echo"];

// Register for connection lifecycle events
[connection setStarted:^{
    NSLog(@"Connection Started");
    [connection send:@"hello world"];
}];
[connection setReceived:^(NSString *message) {
    NSLog(@"Connection Recieved Data: %@",message);
}];
[connection setConnectionSlow:^{
    NSLog(@"Connection Slow");
}];
[connection setReconnecting:^{
    NSLog(@"Connection Reconnecting");
}];
[connection setReconnected:^{
    NSLog(@"Connection Reconnected");
}];
[connection setClosed:^{
    NSLog(@"Connection Closed");
}];
[connection setError:^(NSError *error) {
    NSLog(@"Connection Error %@",error);
}];

[connection start];

Hubs

//Server
public class Chat : Hub 
{
    public void Send(string message)
    {
        // Call the addMessage method on all clients            
        Clients.All.addMessage(message);
    }
}

//Client
#import "SignalR.h"

// Connect to the service
SRHubConnection *hubConnection = [SRHubConnection connectionWithURLString:@"http://localhost/mysite"];
// Create a proxy to the chat service
SRHubProxy *chat = [hubConnection createHubProxy:@"chat"];
[chat on:@"addMessage" perform:self selector:@selector(addMessage:)];

// Register for connection lifecycle events
[hubConnection setStarted:^{
    NSLog(@"Connection Started");
    [connection send:@"hello world"];
}];
[hubConnection setReceived:^(NSString *message) {
    NSLog(@"Connection Recieved Data: %@",message);
}];
[hubConnection setConnectionSlow:^{
    NSLog(@"Connection Slow");
}];
[hubConnection setReconnecting:^{
    NSLog(@"Connection Reconnecting");
}];
[hubConnection setReconnected:^{
    NSLog(@"Connection Reconnected");
}];
[hubConnection setClosed:^{
    NSLog(@"Connection Closed");
}];
[hubConnection setError:^(NSError *error) {
    NSLog(@"Connection Error %@",error);
}];
// Start the connection
[hubConnection start];

- (void)addMessage:(NSString *)message {
    // Print the message when it comes in
    NSLog(message);
}

Customizing Query Params

Persistent Connections

id qs = @{
   @"param1": @1,
   @"param2": @"another"
};
SRConnection *connection = [SRConnection connectionWithURLString:@"http://localhost/mysite" queryString:qs];

Hub Connections

id qs = @{
   @"param1": @1,
   @"param2": @"another"
};
SRHubConnection *hubConnection = [SRHubConnection connectionWithURLString:@"http://localhost/mysite" queryString:qs];

Customizing Request Headers

Persistent Connections

id headers = @{
   @"param1": @1,
   @"param2": @"another"
};
SRConnection *connection = [SRConnection connectionWithURLString:@"http://localhost/mysite"];
[connection setHeaders:headers];

//Alternative Usage
SRConnection *connection = [SRConnection connectionWithURLString:@"http://localhost/mysite"];
[connection addValue:@"1" forHTTPHeaderField:@"param1"];
[connection addValue:@"another" forHTTPHeaderField:@"param2"];

Hub Connections

id headers = @{
   @"param1": @1,
   @"param2": @"another"
};
SRHubConnection *hubConnection = [SRHubConnection connectionWithURLString:@"http://localhost/mysite"];
[hubConnection setHeaders:headers];

//Alternative Usage
SRHubConnection *hubConnection = [SRHubConnection connectionWithURLString:@"http://localhost/mysite"];
[hubConnection addValue:@"1" forHTTPHeaderField:@"param1"];
[hubConnection addValue:@"another" forHTTPHeaderField:@"param2"];

Requirements

SignalR-ObjC requires either iOS 7.0 and above, or Mac OS 10.9 (64-bit with modern Cocoa runtime) and above.

ARC

• SignalR-ObjC requires ARC

Networking

• SignalR-ObjC uses AFNetworking. The minimum supported version of AFNetworking is 2.x
• SignalR-ObjC uses SocketRocket. The minimum supported version of SocketRocket is 0.4.x

LICENSE

SignalR-ObjC is available under the MIT license. See the LICENSE file for more info.
SignalR-ObjC uses 3rd-party code which each have specific licenses, see ACKNOWLEDGEMENTS for contributions