gistfile1.txt

// HACK, but not critical if it fails.
+ (UIPopoverController *)popoverControllerForObject:(id)object {
    if (!PSIsIpad()) return nil;

    UIPopoverController *popoverController = object;

#ifndef PSPDFKIT_DONT_USE_OBFUSCATED_PRIVATE_API
    NSString *printInteractionControllerKeyPath = [NSString stringWithFormat:@"%1$@%2$@.%1$@%3$@%4$@%5$@.%6$@%5$@", @"print", @"State", @"Panel", @"View", @"Controller", @"pover"];
    @try {
        if ([object isKindOfClass:UIPopoverController.class]) {
            popoverController = object;
        }else if ([object isKindOfClass:UIPrintInteractionController.class]) {
            popoverController = [object valueForKeyPath:printInteractionControllerKeyPath];
        }else {
            // Works at least for UIDocumentInteractionController and UIActionSheet
            popoverController = [object valueForKey:PROPERTY(popoverController)];
        }
    }
    @catch (NSException *exception) {
        @try {
            // If Apple fixes the typo in UIPrintPanelViewController and renames the _poverController ivar into _popoverController
            printInteractionControllerKeyPath = [printInteractionControllerKeyPath stringByReplacingOccurrencesOfString:@"pover" withString:@"popover"];
            popoverController = [object valueForKeyPath:printInteractionControllerKeyPath];
        }
        @catch (NSException *exception) {
            popoverController = nil;
        }
    }
#endif

    if ([popoverController isKindOfClass:UIPopoverController.class]) return popoverController;
    else return nil;
}