Checking For Internet Connection Availability

There are many libraries for checking the internet connection availability out there. But currently none of them are converted to Swift. This is the Swift implementation of the simple method to test the internet connection written by Chris Danielson in his blog post.

It's based on the SCNetworkReachability API. Don't forget to add the SystemConfiguration framework to your project.

import Foundation
import SystemConfiguration

public class Reachability {

    class func isConnectedToNetwork() -> Bool {

        var zeroAddress = sockaddr_in(sin_len: 0, sin_family: 0, sin_port: 0, sin_addr: in_addr(s_addr: 0), sin_zero: (0, 0, 0, 0, 0, 0, 0, 0))
        zeroAddress.sin_len = UInt8(sizeofValue(zeroAddress))
        zeroAddress.sin_family = sa_family_t(AF_INET)

        let defaultRouteReachability = withUnsafePointer(&zeroAddress) {
            SCNetworkReachabilityCreateWithAddress(nil, UnsafePointer($0)).takeRetainedValue()
        }

        var flags: SCNetworkReachabilityFlags = 0
        if SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags) == 0 {
            return false
        }

        let isReachable = (flags & UInt32(kSCNetworkFlagsReachable)) != 0
        let needsConnection = (flags & UInt32(kSCNetworkFlagsConnectionRequired)) != 0

        return (isReachable && !needsConnection) ? true : false
    }

}

You can use it like this.

if Reachability.isConnectedToNetwork() {
    println("Haz Interwebz!")
} else {
    println("Oh noes! No interwebz!!!")
}

Get the source code from my Github.

Credits

• Chris Danielson - Author of the original post.
• Martin R - Helped me immensely with converting C code to Swift.

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