How to stop task or section from NSURLSession - ios

Question

I am Using NSURLSession for call an post API, but when i turn of the wifi and then hit the web service and again turn on the wifi NSURLSession is calling that previously call web service, i want to stop this process. i read on some of documents that NSURLSession store the section of every service call when connection break in any situation , and again hit that service when connection established again. So now i am not getting any solution to stop that service call after connection reconnect to my device.
Any one please help me. Thanks in advance.
Below is my code i used.
let token: NSString!
let urlPath: NSURL!
if provider .isEqualToString("No"){
urlPath = NSURL(string: kAPI_SERVERBASEURL + (url as String))
}
else{
urlPath = NSURL(string: kAPI_SERVERBASEURLSEARCHPROVIDER + (url as String))
}
var postJsonData = NSData()
var jsonString = NSString()
do {
postJsonData = try NSJSONSerialization.dataWithJSONObject(dictRequest, options:[])
jsonString = NSString(data: postJsonData, encoding: NSUTF8StringEncoding)!
NSLog("request - %#", jsonString);
// do other stuff on success
} catch {
print("JSON serialization failed: \(error)")
}
let request = NSMutableURLRequest(URL: urlPath);
request.cachePolicy = NSURLRequestCachePolicy.ReloadIgnoringLocalCacheData
request.HTTPShouldHandleCookies = false
request.timeoutInterval = 120 ;
request.HTTPMethod = "POST";
if NSUserDefaults.standardUserDefaults().valueForKey(kAccessToken) != nil{
token = NSUserDefaults.standardUserDefaults().valueForKey(kAccessToken) as! NSString
//token = "tk_1vNoEoZRxJwY"
request.setValue("\(token)", forHTTPHeaderField: "access_token")
}
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
request.HTTPBody = postJsonData
let session = NSURLSession.sharedSession()
let task = session.dataTaskWithRequest(request) { (data:NSData?, response:NSURLResponse?, error:NSError?) -> Void in
`

Answer 1

It may help you.
1.Declare one variable about the NSURLSessionTask like
var task: NSURLSessionTask? = nil
2.When ever you need to call dataTaskWithRequest assign the object to declared object like
task = NSURLSession.sharedSession().dataTaskWithURL(NSURL(fileURLWithPath: ""))
3.when you want to cancel the request just do the below.
if nil != task {
task!.cancel()
task = nil
}
Suppose you want cancel the request before calling another one combine both 2 and 3 steps like
if nil != task {
task!.cancel()
task = nil
}
task = NSURLSession.sharedSession().dataTaskWithURL(NSURL(fileURLWithPath: ""))