How can I present a ModalViewController from a UIActivity item picked from UIActivity View Controller?

I am working on an app that presents some data in a detailViewController. I have a rightBarButton in the navbar that presents a UIActivityViewController that is filled with my own UIActivity sublclassed items. Most of them work fine as they are just changing a small aspect to the data from the detail view, but I need one of them to open a modalViewController when selected. I keep getting the following warning from the console..... ``` Warning: Attempt to present <UINavigationController: 0x1fd00590> on <UITabBarController: 0x1fde1070> which is already presenting <MPActivityViewController: 0x1fd2f970> ``` I suppose it is worth noting that the app doesn't crash but the modal view doesn't appear either. I am assuming that the UIActivityViewController is a modal view itself and you can only display one of those at a time so the task is to figure out how to perform my segue after the ActivityView has disappeared, but thats where I am stumped. I welcome any help, thoughts or feedback. I've tried google but haven't had much luck, I assume because The UIActivityViewController is so new. Here is my setup so far, my UIActivity objects have a delegate set to the detailViewController for a custom protocol that lets the detailViewController perform the data changes and then update its view. for the activities in question that should present the modalView controller I have tried a few approaches that all get the same warning. None of These Works!!! 1) simply tried performing segue from my delegate method ``` - (void) activityDidRequestTransactionEdit { NSLog(@"activityDidRequestTransactionEdit"); [self performSegueWithIdentifier:@"editTransaction" sender:self]; } ``` 2)tried setting a completion block on the UIActivityViewController and having my delegate method set a bool flag that the modal view should be shown(self.editor) ``` [activityViewController setCompletionHandler:^(NSString *activityType, BOOL completed) { NSLog(@"completed dialog - activity: %@ - finished flag: %d", activityType, completed); if (completed && self.editor) { [self performSegueWithIdentifier:@"editTransaction" sender:self]; } }]; ``` 3) subclassing the UIActivityViewController itself, giving it the detailView as a delegate, and overriding it's dismissViewControllerAnimated: method with my own completion block ``` - (void) dismissViewControllerAnimated:(BOOL)flag completion:(void (^)(void))completion { [super dismissViewControllerAnimated:flag completion:^{ [self.MPActivityDelegate activityDidRequestTransactionEdit]; }]; } ``` The working Solution In the UIActivity subclass you need to override this method like so ``` - (UIViewController *) activityViewController { MPEditMyDataViewController *controller = [[MPEditMyDataViewController alloc] init]; controller.activity = self; // more on this property below UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:controller]; return navController; } ``` in your MPEditMyDataViewController.h (the view controller the chosen action should produce) You need a property back to the activity subclass like so ``` @property (strong, nonatomic) MPEditMyDataActivity *activity; ``` in your MPEditMyDataViewController.m ``` - (void)viewDidLoad { [super viewDidLoad]; UIBarButtonItem *cancelButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCancel target:self action:@selector(cancel)]; self.navigationItem.leftBarButtonItem = cancelButton; } // here's how you dismiss the view controller when you are done with it // after saving the changes to your data or whatever the view controller is supposed to do. -(void) cancel { NSLog(@"Cancel Button Pushed"); [self.activity activityDidFinish:YES]; } @end ```