Removing a View Controller from Memory When Instantiating a New View Controller

Removing a view controller from memory when instantiating a new view controller

You need only to use:

EDIT Swift 4.2

self.dismiss(animated:true, completion: nil)

The rest of work is doing by ARC

To help you during your debug you can add also this code:

 if let app = UIApplication.shared.delegate as? AppDelegate, let window = app.window {
        if let viewControllers = window.rootViewController?.children {
            for viewController in viewControllers {
                print(viewController.debugDescription)
            }
        }
    }

Remove a modal ViewController from ram SWIFT

Swift uses automatic reference counting for memory management. Objects will be released from memory if no references to them exist anymore.

You can remove a reference by setting a variable referencing the object to nil.

vc = nil

or by using weak references whenever possible.

If you dismiss the view controller, you have to make sure, there are no references left or it will not be released from memory.

Also, iOS may keep some data around. Just make sure, that memory usage does not grow significantly on subsequent presentations of your view controller. Only then you may have a reference cycle.

Remove previous view controllers from view hierarchy after update from background

if let therootController = UIApplication.shared.keyWindow?.rootViewController {
    // If rootViewcontroller is navigationController then pop to root if any controllers has been pushed, dismiss if any controllers has been presented.
}
UIApplication.shared.keyWindow?.rootViewController = nil
let rootStoryBoard = UIStoryboard(name: "Main", bundle: nil)
let rootVC = rootStoryBoard.instantiateViewController(withIdentifier: "MainTabBarController")
rootVC.view.layoutIfNeeded()
UIApplication.shared.keyWindow?.rootViewController = rootVC
UIApplication.shared.keyWindow?.makeKeyAndVisible()

Unable to remove child viewcontroller after Navigation

I added the following in VC1 and it solved my problem

override func viewWillDisappear(_ animated: Bool) {

    for controllers in self.childViewControllers
    {
        controllers.willMove(toParentViewController: nil)
        controllers.view.removeFromSuperview()
        controllers.removeFromParentViewController()
    }

}

Is a ViewController unloaded from memory after being dismissed?

So does this mean that any VC's presented modally are dismissed from memory after you call dismiss

Normally, yes. View controllers form a hierarchy or chain of parent/presenter and child/presented. The former owns and retains the latter, and releases it when the latter is removed. The root controller is never removed unless you deliberately replace it.

Removing the view controller from memory after logging out?

Add NSLog in dealloc

And maybe you have some memory leak in your code(MainViewController).

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