Modal transition - One of the views is seemingly getting deallocated

Question

In my app, I do a search asynchronously. When that completes my mapViewController with pins for the locations is displayed. 2 seconds after that, I do a modal transition over to a listViewController. I set the backgroundcolor like this:

self.view.backgroundColor = [UIColor colorWithWhite:1.0 alpha:0.65];

Making it possible to see the map behind it.

The problem is this: Less then a second after the listView appears you can see the map in the background for a second before it goes away. What I can see in the background now, is the mainViewController the app starts with.

it looks like this:

Less than a second later:

Any help/explanation would be greatly appreciated.

Answer 1

Your view is still transparent, but once your modal controller is at the top of the stack, the view behind it is hidden.

Try using :

yourController.modalPresentationStyle = UIModalPresentationCurrentContext;
[yourController present...];

Answer 2

This code seems to work. I hope it will help. 

-(void)viewDidLoad
{
    [super viewDidLoad];

    // Do any additional setup after loading the view from its nib.

    MKMapView *mapView = [MKMapView new];
    [self.view addSubview:mapView];
    mapView.frame = self.view.bounds;

    UIGestureRecognizer *gestureRecognizer = [UITapGestureRecognizer new];
    [gestureRecognizer addTarget:self action:@selector(displayTransparentVC)];
    [self.view addGestureRecognizer:gestureRecognizer];
}

-(void)displayTransparentVC
{
    UIViewController *vc = [TransparentViewController new];
    self.modalPresentationStyle = UIModalPresentationCurrentContext;
    [self presentViewController:vc animated:YES completion:^{
    }];
}