ios - NSMutableDictionary に格納され、UIViewControllerContainment によって提示される UIViewControllers で Dealloc が呼び出されます。

Question

Storyboards/Segues と UIViewController を含むカスタム UITabBarController を作成しました。ここにリンクがあります：https://github.com/mhadl/MHCustomTabBarController

コンテナによって提示される UIViewControllers は、NSMutableDictionary に格納されます (キーはセグエの識別子です)。以前に提示された ViewController に戻るポイントに到達するまで、すべてが正常に機能しています。この時点で、この ViewController が表示される前に「dealloc」が呼び出されます。

「dealloc」が呼び出されないようにして、通知の購読を解除したり、デリゲートをなくしたりするにはどうすればよいですか。

MHCustomTabBarController:

    @implementation MHCustomTabBarController {
    NSMutableDictionary *_viewControllersByIdentifier;
}

- (void)viewDidLoad {
    [super viewDidLoad];

    _viewControllersByIdentifier = [NSMutableDictionary dictionary];
}

-(void) viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];

    if (self.childViewControllers.count < 1) {
        [self performSegueWithIdentifier:@"viewController1" sender:[self.buttons objectAtIndex:0]];
    }
}

- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
    self.destinationViewController.view.frame = self.container.bounds;
}



#pragma mark - Segue

-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

    if (![segue isKindOfClass:[MHTabBarSegue class]]) {
        [super prepareForSegue:segue sender:sender];
        return;
    }

    self.oldViewController = self.destinationViewController;

    //if view controller isn't already contained in the viewControllers-Dictionary
    if (![_viewControllersByIdentifier objectForKey:segue.identifier]) {
        [_viewControllersByIdentifier setObject:segue.destinationViewController forKey:segue.identifier];
    }

    for (UIButton *aButton in self.buttons) {
        [aButton setSelected:NO];
    }

    UIButton *button = (UIButton *)sender;
    [button setSelected:YES];
    self.destinationIdentifier = segue.identifier;
    self.destinationViewController = [_viewControllersByIdentifier objectForKey:self.destinationIdentifier];


}

- (BOOL)shouldPerformSegueWithIdentifier:(NSString *)identifier sender:(id)sender {
    if ([self.destinationIdentifier isEqual:identifier]) {
        //Dont perform segue, if visible ViewController is already the destination ViewController
        return NO;
    }

    return YES;
}

#pragma mark - Memory Warning

- (void)didReceiveMemoryWarning {
    [[_viewControllersByIdentifier allKeys] enumerateObjectsUsingBlock:^(NSString *key, NSUInteger idx, BOOL *stop) {
        if (![self.destinationIdentifier isEqualToString:key]) {
            [_viewControllersByIdentifier removeObjectForKey:key];
        }
    }];
}

@end

MHTabBarSegue:

@implementation MHTabBarSegue
- (void) perform {
    MHCustomTabBarController *tabBarViewController = (MHCustomTabBarController *)self.sourceViewController;
    UIViewController *destinationViewController = (UIViewController *) tabBarViewController.destinationViewController;

    //remove old viewController
    if (tabBarViewController.oldViewController) {
        [tabBarViewController.oldViewController willMoveToParentViewController:nil];
        [tabBarViewController.oldViewController.view removeFromSuperview];
        [tabBarViewController.oldViewController removeFromParentViewController];
    }


    destinationViewController.view.frame = tabBarViewController.container.bounds;
    [tabBarViewController addChildViewController:destinationViewController];
    [tabBarViewController.container addSubview:destinationViewController.view];
    [destinationViewController didMoveToParentViewController:tabBarViewController];
}

@end