Msgs.io library for iOS.
No external dependencies.
Register your bundle with Apple to enable push notifications. read more here: http://developer.apple.com/library/mac/#documentation/NetworkingInternet/Conceptual/RemoteNotificationsPG/ProvisioningDevelopment/ProvisioningDevelopment.html#//apple_ref/doc/uid/TP40008194-CH104-SW1
Add the following fields to your project .plist files: MSGSAPIKey - The API key you received. MSGSAPIURL - The Msgs.io API endpoint.
The sample project has a simple interface that registers the device with the server, allows you to subscribe to channels and lists your subscriptions.