ios - How to use MBProgressHUD with swift

Question

here is my code , but it showing the progress . is there any error in this code? please give some idea to fix this, or give some link related to this.

class Approval: UIViewController {

var hud: MBProgressHUD = MBProgressHUD()

override func viewDidLoad() {
    super.viewDidLoad()

    fetchData()
}
   func fetchData(){
      hud.show(true)
      // doing some http request
      dispatch_async(dispatch_get_main_queue()) {
         hud.hide(true)          
      }
   }

}

Answer 1

Updated Answer:

let loadingNotification = MBProgressHUD.showAdded(to: view, animated: true)
loadingNotification.mode = MBProgressHUDMode.indeterminate
loadingNotification.label.text = "Loading"

To dismiss the ProgressHUD:

MBProgressHUD.hideAllHUDs(for: view, animated: true)