SecondViewController.m

@interface SecondViewController ()

@property (nonatomic) BOOL isPresented; // This property is very important

@end

@implementation SecondViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.isPresented = YES; // Set it to true, when controller is initialised
}

- (IBAction)dismiss:(id)sender
{
    self.isPresented = NO; // Set this flag to NO before dismissing controller, so that correct orientation will be chosen for the bottom controller
    [self.presentingViewController dismissViewControllerAnimated:YES completion:nil];
}

@end