NSURLSession validation - swift

Question

I'm trying o work out the correct (or at least a good) way to handle data request using Swift 2.
What i want to achieve is to:
Check if a data connection is available, if no then alert the user
If connection is available make a request
Check request response, if invalid then alert the user
if valid, check the response code and display one of 2 messages
what i have so far
let requestURL: String = **********************
let url = NSURL(string: requestURL)!
let request = NSMutableURLRequest(URL: url)
let session = NSURLSession.sharedSession()
let postParams: NSDictionary = ["id":newId!]
request.HTTPMethod = "POST"
do {
let jsonData = try NSJSONSerialization.dataWithJSONObject(postParams, options: [])
let jsonString = NSString(data: jsonData, encoding: NSUTF8StringEncoding)! as String
let utf8str = jsonString.dataUsingEncoding(NSUTF8StringEncoding)
let base64Encoded = utf8str?.base64EncodedStringWithOptions(NSDataBase64EncodingOptions(rawValue: 0))
let bodyData = "data="+base64Encoded!
request.HTTPBody = bodyData.dataUsingEncoding(NSUTF8StringEncoding)
} catch {
print("Error serialising JSON")
}
session.dataTaskWithRequest(request) { data, response, error in
// Make sure response is OK
guard let realResponse = response as? NSHTTPURLResponse where realResponse.statusCode == 200 else
{
// Show success message
print("Invalid Response from server")
}
// Read JSON Data
if let postString = NSString(data:data!, encoding: NSUTF8StringEncoding) as? String {
if let responseData = postString.dataUsingEncoding(NSUTF8StringEncoding) {
let json = JSON(data: responseData)
let responseMessage:String = json["response"]["data"].stringValue
if(responseMessage == "success")
{
print("successful post")
}else{
print("error saving post")
}
}
}
}
Currently if i was to run this in airplane mode then nothing happens, but i would like to catch this and tell these they need a data connection

Answer 1

Try sth like this:
func connectedToNetwork() -> Bool {
var zeroAddress = sockaddr_in()
zeroAddress.sin_len = UInt8(sizeofValue(zeroAddress))
zeroAddress.sin_family = sa_family_t(AF_INET)
let defaultRouteReachability = withUnsafePointer(&zeroAddress) {
SCNetworkReachabilityCreateWithAddress(nil, UnsafePointer($0))
}
var flags = SCNetworkReachabilityFlags()
if !SCNetworkReachabilityGetFlags(defaultRouteReachability!, &flags) {
return false
}
let isReachable = (flags.rawValue & UInt32(kSCNetworkFlagsReachable)) != 0
let needsConnection = (flags.rawValue & UInt32(kSCNetworkFlagsConnectionRequired)) != 0
return (isReachable && !needsConnection)
}
if(connectedToNetwork() == true){
//call your function to make the request
} else {
//show alert that they need an internet connection
}