Question

In my MainViewController, I present another view controller through this:

MessageViewController *messageController = [[MessageViewController alloc]initWithNibName:nil bundle:nil];

[messageController setModalPresentationStyle:UIModalPresentationFullScreen];
[messageController setModalTransitionStyle:UIModalTransitionStyleFlipHorizontal];

[self presentViewController:messageController animated:YES completion:nil];

[messageController release];

This will display the view controller correctly. However, when I try to go back to the presenting view controller, which in this case should be the MainViewController, this code doesn’t work:

if ([self.presentingViewController isKindOfClass:[MainViewController class]])
    [(MainViewController *)self.presentingViewController setCurrentViewTag:2];

[self dismissModalViewControllerAnimated:YES];

I removed the “if..” condition to force it in setting the current view tag. An error occurred telling me that the presenting view controller seems to be the UINavigationController:

[UINavigationController setCurrentViewTag:]: unrecognized selector sent to instance 0x8352a50

Can anyone tell me why is this happening? This code used to work before and I am not sure what changed to make it stop working properly.

EDIT

Here is the updated code:

ReaderController *readerController = [[ReaderController alloc]initWithNibName:nil bundle:nil];
[readerController loadWhichViewToShow:2];

[self setDefinesPresentationContext:YES];

[readerController setModalPresentationStyle:UIModalPresentationFullScreen];
[readerController setModalTransitionStyle:UIModalTransitionStyleFlipHorizontal];

[self presentViewController:readerController animated:YES completion:nil];

[readerController release];

Answer 1

Calling [self presentViewController:messageController animated:YES completion:nil]; doesn’t necessarily use the vc you call this on to present the other vc. By default it travels up the vc-hierarchy and presents the other vc on the root view controller. That’s why in your case the presenting view controller is a UINavigationController.

If you want to force your MainViewController to be the presenting vc, you have call:

[self setDefinesPresentationContext:YES];

on your MainViewController before presenting the MessageViewController.

Edit: In case someone else reads this: definesPresentationContext seems to be bugged or the documentation is wrong. See the comments below and Cocoa Builder