Warning :-Presenting view controllers on detached view controllers is discouraged

Question

To avoid getting the warning in a push navigation, you can directly use :

[self.view.window.rootViewController presentViewController:viewController animated:YES completion:nil];

And then in your modal view controller, when everything is finished, you can just call :

[self dismissViewControllerAnimated:YES completion:nil];

Wait for viewDidAppear():

This error can also arise if you are trying to present view controller before view actually did appear, for example presenting view in viewWillAppear() or earlier. Try to present another view after viewDidAppear() or inside of it.

The reason of this warning is i was presenting a view controller over a small view that is not full size view. Given below is the image of my project. where on click on four option above. User navigate to different childviewcontroller's view.(it works like tabViewcontroller). But the childviewcontroller contains view of small size. So if we present a view from childviewcontroller it gives this warning.

And to avoid this, you can present a view on childviewcontroller's parent

  [self.parentViewController presentViewController:viewController animated:YES completion:nil];

In my case, I've a sampleViewController's view added as a subview, then tries to present a popover from the view of sampleViewController (here self instead a UIViewController instance):

[self.view addSubview:sampleViewController.view];

The right way should be below:

// make sure the vc has been added as a child view controller as well
[self addChildViewController:sampleViewController];
[self.view addSubview:sampleViewController.view];
[sampleViewController didMoveToParentViewController:self];

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B.t.w., this also works for the case that present a popover form a tableview cell, you just need to make sure the tableview controller has been added as child view controller as well.