camera - How to dismiss imagePicker when user don't allow access in iOS -

i checking camera , photo permission on app when user select or capture image. using code.

-(void)choosephotofromexistingimages  {        alauthorizationstatus status = [alassetslibrary authorizationstatus];     if (status == alauthorizationstatusdenied  || status == alauthorizationstatusrestricted) {         [appdelegate showalertviewforphotos];         //show alert asking user give permission         }     else{         if ([uiimagepickercontroller issourcetypeavailable: uiimagepickercontrollersourcetypephotolibrary])         {             uiimagepickercontroller *controller = [[uiimagepickercontroller alloc] init];             controller.sourcetype = uiimagepickercontrollersourcetypesavedphotosalbum;             controller.allowsediting = yes;             controller.mediatypes = [[nsarray alloc] initwithobjects: (nsstring *) kuttypeimage, nil] ;             controller.delegate = self;             [self presentviewcontroller: controller animated: yes completion: nil];         }     }    } 

the code working fine when user first time choose don't allow photo library display black screen same thing happening in camera. need when user press on don't allow can check user has cancel permission can dismiss imagepicker or camera .

you can use alassetslibrary authorizationstatus check it

how react user choosing "don't allow" when asking permission access photos?