Best practice to hide the HUD added to view - ios

Question

Suppose that I have the following code:
#IBAction func signInButtonPressed(sender: AnyObject) {
MBProgressHUD.showHUDAddedTo(self.view, animated: true)
if let url = NSURL(string: someURL) {
// ...
let task = NSURLSession.sharedSession().dataTaskWithRequest(request) {
(data, response, error) in
if let httpError = error {
dispatch_async(dispatch_get_main_queue()) {
self.alert("Error", message: "Unable to sign in: \(httpError.localizedDescription)")
}
return
}
var deserializationError: NSError?
if let jsonData = NSJSONSerialization.JSONObjectWithData(data, options: nil, error: &deserializationError) as? [String: AnyObject] {
// ...
if let error = customer.error {
dispatch_async(dispatch_get_main_queue()) {
self.alert("Error", message: error)
}
} else {
// Show other view controller
}
} else {
if let unwrappedError = deserializationError {
dispatch_async(dispatch_get_main_queue()) {
self.alert("Error", message: "Unable to sign in: \(deserializationError)")
}
}
}
}
task.resume()
} else {
if let unwrappedError = serializationError {
self.alert("Error", message: "Unable to sign in: \(serializationError)")
}
}
}
}
What is the proper way to hide the HUD added to self.view? Is there any more elegant way to do this than adding the
dispatch_async(dispatch_get_main_queue()) {
MBProgressHUD.hideHUDForView(self.view, animated: true)
return
}
code to every if and else branches?
Thanks in advance.

Answer 1

first show your hud after your url initialized and right before your task get started
if let url = NSURL(string: someURL) {
MBProgressHUD.showHUDAddedTo(self.view, animated: true)
// start the request here
then hide it right after callback block started
let task = NSURLSession.sharedSession().dataTaskWithRequest(request) {
(data, response, error) in
dispatch_async(dispatch_get_main_queue()) {
MBProgressHUD.hideHUDForView(self.view, animated: true)
}
// here goes other logic
you don't have to call return after hud gets hidden