Replacement for Apple's Reachability re-written in Swift with closures

Inspired by https://github.com/tonymillion/Reachability

NOTES:

• As of Swift 1.2, you cannot convert Swift closures into C-function pointers, meaning we can't set an SCNetworkReachabilityCallBack. To get around this, this reachability replacement uses a dispatch_source firing at 1/2 second intervals.

• If an application has the privacy option “Use cellular data” turned off, the Reachability class still reports isReachable() to be true. There is currently no (non-private) API to detect this. If you need this feature, please raise file a bug report with Apple to get this fixed. See devforums thread for details: https://devforums.apple.com/message/1059332#1059332

CocoaPods is a dependency manager for Cocoa projects. To install Reachability.swift with CocoaPods:

1. Make sure CocoaPods is installed.

2. Update your Podfile to include the following:

   use_frameworks!
   pod 'ReachabilitySwift', git: 'https://github.com/ashleymills/Reachability.swift'

3. Run pod install.

Just drop the Reachability.swift file into your project. That's it!

let reachability = Reachability.reachabilityForInternetConnection()

reachability.whenReachable = { reachability in
    if reachability.isReachableViaWiFi() {
        println("Reachable via WiFi")
    } else {
        println("Reachable via Cellular")
    }
}
reachability.whenUnreachable = { reachability in
    println("Not reachable")
}

reachability.startNotifier()

let reachability = Reachability.reachabilityForInternetConnection()

NSNotificationCenter.defaultCenter().addObserver(self, selector: "reachabilityChanged:", name: ReachabilityChangedNotification, object: reachability)

reachability.startNotifier()

and

func reachabilityChanged(note: NSNotification) {

    let reachability = note.object as! Reachability

    if reachability.isReachable() {
        if reachability.isReachableViaWiFi() {
            println("Reachable via WiFi")
        } else {
            println("Reachable via Cellular")
        }
    } else {
        println("Not reachable")
    }
}

Got a bug fix, or a new feature? Create a pull request and go for it!

If you use Reachability.swift, please let me know about your app and I'll put a link here… and tell your friends!

Cheers, Ash