Dismiss and Present same view controller

Question

i have a view controller and i need to dismiss it and present it back in same time. i had tried dismiss it and call back the view controller but not working.

[self dismissViewControllerAnimated:YES completion:nil];
UIStoryboard *storyboard=[UIStoryboard storyboardWithName:@"Main" bundle:nil];
ExpandViewController *expandView=
    [storyboard instantiateViewControllerWithIdentifier:@"ExpandViewController"];
expandView.delegate=self;
[expandView setEventDict:dict];
[self presentViewController:expandView animated:YES completion:NULL];

Answer 1

You can't present a view controller until the currently presented view controller has finished being dismissed. You won't know this has happened until the completion handler from your dismissal is called. Your mistake is that the completion handler is nil . Instead, provide a completion handler (in your first line), consisting of the remaining lines of your code. Thus, they will execute after the dismissal finishes.

[self dismissViewControllerAnimated:YES completion:^{
    // ... the rest of your code goes in here ...
}];

Answer 2

I am not exactly sure what outcome/functionality you are looking for in your question, but @matt is correct. However, you may be looking to have this happen seamlessly. Therefore you could use child view controllers instead of presenting the view controller using the [self presentViewController:VC animated:animate completion:nil] method.

Adding child vc:

[self addChildViewController:myVC];
[self.view addSubview:myVC.view];
[myVC didMoveToParentViewController:self];

Removing child vc:

[myVC willMoveToParentViewController:nil];
... remove subview.

You can set up a delegate between the two controllers to tell the parent when to dismiss the view to make things easy. You can also add the subviews at different indexes using [self.view insertSubview:myVC atIndex:index] or the other possible functions such as the insert above subview etc, to have one subview be added before dismissing the other to give a more seamless transition.

Hope this helps!