I want to add a tableViewController as a child view controller of a containerViewController (shown below). According to Apple's View Controller Programming Guide I can achieve this by the following lines of code inside my containerViewController:
[self addChildViewController:tableViewController];
[self.view addSubview:tableViewController.view];
[tableViewController didMoveToParentViewController:self];
In fact, that works fine. Now the problem is that I do not want to add the tableViewController's view as a subview of the containerViewController's root view. Instead I want to add it as a subview of the containerView (see image) which itself is a subview of the containerViewController's root view. So I changed the above code as follows:
[self addChildViewController:tableViewController];
[self.contentView addSubview:tableViewController.view];
[tableViewController didMoveToParentViewController:self];
Now when I launch the app it crashes immediately with this error:
Terminating app due to uncaught exception 'UIViewControllerHierarchyInconsistency', reason: 'child view controller: should have parent view controller: but actual parent is:'
What is the problem here? Is it not possible to add a childViewController's view to a specific sub view of its containerViewController? Or how can I achieve this without an error in the view controller hierarchy?
It doesn't really matter which view you are adding the child viewController to. If a view of a viewController is added to another viewController you need set it properly.
Source code
To show a child_view_controller over a main_view_controller.
step 1: create a main_view_controller in storyboard.
step 2: create a child_view_controller with a UIview and some Label inside in storyboard.
step 3: in main_view_controller's button action add the following code:
Add and remove viewcontroller ,#childviewcontroller