Tracking iPhone Data Usage [duplicate]

Answer 1

Updated @Aaron Brager answer for Swift 4 and Xcode 9.

func getDataUsage() -> (wifi : (sent : UInt32, received : UInt32), wwan : (sent : UInt32, received : UInt32)) {
    var interfaceAddresses : UnsafeMutablePointer? = nil
    var networkData: UnsafeMutablePointer? = nil
    var pointer: UnsafeMutablePointer? = nil

    var returnTuple : (wifi : (sent : UInt32, received : UInt32), wwan : (sent : UInt32, received : UInt32)) = ((0, 0), (0, 0))

    if getifaddrs(&interfaceAddresses) == 0 {
        pointer = interfaceAddresses
        while pointer != nil {
            let name : String = String.init(validatingUTF8: pointer!.pointee.ifa_name)!
            let flags = UInt32((pointer?.pointee.ifa_flags)!)//Int32(pointer?.pointee.ifa_flags)
            let addr = pointer?.pointee.ifa_addr.pointee

            if addr?.sa_family == UInt8(AF_LINK) {
                    if name.hasPrefix("en") {
                        networkData = unsafeBitCast(pointer?.pointee.ifa_data, to: UnsafeMutablePointer.self)
                        returnTuple.wifi.sent += (networkData?.pointee.ifi_obytes)!
                        returnTuple.wifi.received += (networkData?.pointee.ifi_ibytes)!
                    } else if name.hasPrefix("pdp_ip") {
                        networkData = unsafeBitCast(pointer?.pointee.ifa_data, to: UnsafeMutablePointer.self)
                        returnTuple.wwan.sent += (networkData?.pointee.ifi_obytes)!
                        returnTuple.wwan.received += (networkData?.pointee.ifi_ibytes)!
                    }
                }

            pointer = pointer?.pointee.ifa_next
        }
    }

    freeifaddrs(interfaceAddresses)

    return returnTuple
}