Reachability.swift

//
//  Reachability.swift
//
// The MIT License (MIT)
// Copyright © 2015 Arnold Sakhnov
//
// Super simple Swift 2.0 struct for your basic Rechability needs
// Use it like so:
//
// if (Rechability.isCurrentlyConnected) { ... }
//
// or:
//
// let currentlyConnected = Rechability.isCurrentlyConnected
// if (currentlyConnected.viaWiFi) { ... }
// else if (currentlyConnected.viaCellular) { ... }
//

import Foundation
import SystemConfiguration

struct Reachability {
    
    struct ConnectionStatus: BooleanType {
        let isConnected: Bool
        let viaWiFi: Bool
        let viaCellular: Bool
        var boolValue: Bool {
            return isConnected
        }
    }
    
    static var isCurrentlyConnected: ConnectionStatus {
        
        var zeroAddress = sockaddr_in()
        zeroAddress.sin_len = UInt8(sizeofValue(zeroAddress))
        zeroAddress.sin_family = sa_family_t(AF_INET)
        
        var flags = SCNetworkReachabilityFlags.ConnectionAutomatic
        
        let routeReachability = withUnsafePointer(&zeroAddress) {
            SCNetworkReachabilityCreateWithAddress(nil, UnsafePointer($0))
        }
        
        guard let reachability = routeReachability where SCNetworkReachabilityGetFlags(reachability, &flags) else {
            return ConnectionStatus(isConnected: false, viaWiFi: false, viaCellular: false)
        }
        
        let isReachable = (flags.rawValue & SCNetworkReachabilityFlags.Reachable.rawValue) != 0
        let needsConnection = (flags.rawValue & SCNetworkReachabilityFlags.ConnectionRequired.rawValue) != 0
        
        let isConnected = (isReachable && !needsConnection)
        
        guard isConnected else {
            return ConnectionStatus(isConnected: isConnected, viaWiFi: false, viaCellular: false)
        }
        
        let isOnCellular = (flags.rawValue & SCNetworkReachabilityFlags.IsWWAN.rawValue) != 0
        
        return ConnectionStatus(isConnected: isConnected, viaWiFi: !isOnCellular, viaCellular: isOnCellular)
        
    }
}