Filter apps that UIDocumentInteractionController suggests to Open In

Question

Is it possible to manage the list of apps that UIDocumentInteractionController is going to present for opening my file in? Actually, I need to create black and white lists of apps. I took a look at UIDocumentInteractionControllerDelegate but it doesn't contain the needed methods..only
- (void) documentInteractionController: (UIDocumentInteractionController *) controller willBeginSendingToApplication: (NSString *) application

and I need something like

-(BOOL)shouldPresentForOpenInApplication: (NSString *)

Answer 1

Actually I figured out how to do it. This is a bit like a trick but it works. All you need to do is to implement a delegate's method, like so

- (void) documentInteractionController: (UIDocumentInteractionController *) controller willBeginSendingToApplication: (NSString *) application {
    BOOL isAppAllowed = YES;
    // Make a decision based on app bundle identifier whether to open it or not
    if (isAppAllowed) {
        dispatch_async(dispatch_get_main_queue(), ^{
            [self showRejectionMessage];
        });
        [self stopSendingFileUsingDocController:controller toApplication:application];
    }
}

And the actual method in which we deceive the doc controller by substituting bad url.

-(void)stopSendingFileUsingDocController:(UIDocumentInteractionController *)controller toApplication:(NSString *)application
{
    NSURL *documentURL = controller.URL;
    NSString *filePath = [documentURL path];
    filePath = [filePath stringByDeletingLastPathComponent];
    NSString *filename = [filePath lastPathComponent];
    NSMutableString *carets = [NSMutableString string];
    for (NSUInteger i = 0; i < [filename length]; i++)
    {
        [carets appendString:@"^"];
    }

#ifndef __clang_analyzer__
    filePath = [filePath stringByAppendingPathComponent:carets];
    NSURL *newURL = [[NSURL alloc] initFileURLWithPath:filePath];
    controller.URL = newURL;
#endif
    [self documentInteractionController:controller didEndSendingToApplication:application];
}