How to indicate network activity in status bar - nsurlsession

Question

I use Alamofire for networking in my iOS application. I need to run this app in iOS 7+. I want to indicate network activity in status bar, so I created this struct:
struct ActivityManager {
static var activitiesCount = 0
static func addActivity() {
if activitiesCount == 0 {
UIApplication.sharedApplication().networkActivityIndicatorVisible = true
}
activitiesCount++
}
static func removeActivity() {
if activitiesCount > 0 {
activitiesCount--
if activitiesCount == 0 {
UIApplication.sharedApplication().networkActivityIndicatorVisible = false
}
}
}
}
But I don't know, where to call in code addActivity() and removeActivity() methods. I don't want to write them with every request. I want to, that they will be called automatically with every request.
I tried also use pure NSURLSession and NSURLSessionTask and extend them:
extension NSURLSessionTask {
func resumeWithActivity() {
ActivityManager.addAction()
self.resume()
}
}
public extension NSURLSession {
func OwnDataTaskWithRequest(request: NSURLRequest!, ownCompletionHandler: ((NSData!, NSURLResponse!, NSError!) -> Void)?) -> NSURLSessionDataTask! {
return self.dataTaskWithRequest(request, completionHandler: { (data, response, error) in
ActivityManager.removeAction()
ownCompletionHandler!(data, response, error)
})
}
}
Then I used them like this:
var session: NSURLSession = NSURLSession(configuration: config, delegate: self, delegateQueue: nil)
session.OwnDataTaskWithRequest(request) { (data, response, error) -> Void in
// some logic here
}.resumeWithActivity()
But this approach doesn't work. In iOS 7 is NSURLSession extension not visible. I created a bug report for this (with sample project).
Can you please give me some advise, how to reach my goal? With or without Alamofire?

Answer 1

If you don't want to call your functions manually for every request and that you want to use Alamofire, I suggest you to improve it to add the network activity indicator feature.
Have a look at the source of Alamofire
You need to register 2 notification observers in your ActivityManager and then trigger the notifications at the relevant places either in Alamofire.Manager or in Alamofire.Request.
Also have a look at the source of AFNetworkActivityIndicatorManager which implement the feature you want in AFNetworking.