I have a problem when dragging a navigation bar or toolbar (storyboard) to my view controller.
UINavigationBar:
Please see my answer here, I've copied the content below for convenience:
https://stackoverflow.com/a/18912291/1162959
The easiest workaround I've found is to wrap the view controller you want to present inside a navigation controller, and then present that navigation controller.
MyViewController *vc = [MyViewController new];
UINavigationController *nav = [[UINavigationController alloc]
initWithRootViewController:vc];
[self presentViewController:nav animated:YES completion:NULL];