Question

I have an B UIViewController and there’s close button inside.

        -(IBAction) close:(id) sender 

From A viewcontroller I present the B viewcontroller like this

  [self presentViewController:B animated:YES completion:NULL];

then everything is OK, I can hit the close button inside B.

However if I do

   B* bcontrol=[[B alloc] init];
   [self.view addsubview bcontrol.view];

then this way, if I hit the close button, it generate EXEC_BAD_ACCESS error.

why is that? any ideas?

Answer 1

You’re using ARC, I assume.

You create bcontrol as a local variable and don’t keep a reference to it, so ARC releases it when you strip out its view. Then your button tries to trigger an action in a deallocated object…and you know the rest.

Make B a strong property so that it stays around while you need it’s view.