ios - removeFromSuperview() takes too long -

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i try save object viewcontroller.swift core data after picking image imagepickercontroller. display view (dynamicview) spinner while saving. object saved in 1 or 2 seconds, dynamicview takes 7 or 8 seconds removed superview. 

func imagepickercontroller(picker: uiimagepickercontroller, didfinishpickingmediawithinfo info: [nsobject : anyobject]){     dismissviewcontrolleranimated(true, completion: nil)     picture = info[uiimagepickercontrolleroriginalimage] as? uiimage     view.addsubview(dynamicview)     var newimagedata = uiimagejpegrepresentation(picture, 1)     objecttosave?.photo = newimagedata     progressbardisplayer("test", true)     dispatch_async(dispatch_get_global_queue(         int(qos_class_user_interactive.value), 0)) {             self.save()     } }  func save() {     var error : nserror?     if(!managedobjectcontext!.save(&error) ) {         println(error?.localizeddescription)     }else{         println("no error, saved")         self.dynamicview.removefromsuperview()       }     nsnotificationcenter.defaultcenter().postnotificationname("load", object: nil) }

call removefromsuperview() main thread make sure ui synchronized:

func save() {     var error : nserror?     if(!managedobjectcontext!.save(&error) ) {         println(error?.localizeddescription)     }else{         println("no error, saved")         dispatch_async(dispatch_get_main_queue(),{                         self.dynamicview.removefromsuperview()         }       }     nsnotificationcenter.defaultcenter().postnotificationname("load", object: nil) }

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