How to trigger some code when back from "Over Current Content" ViewController? - ios

Question

There are two ViewController in my app, ViewController and ViewController2
In ViewController, a button set Present Modally segue to "ViewController2"
And ViewController override viewWillAppear
override func viewWillAppear(_ animated: Bool) {
super.viewDidAppear(animated)
print("will appear")
}
In ViewController2, a button to go back
#IBAction func close(_ sender: Any) {
self.dismiss(animated: true, completion: nil)
}
Now it still can trigger viewWillAppear then I go back to ViewController from ViewController2
If I change ViewController2's presentation from Full Screen to Over Current Context, viewWillAppear will not be triggered
How can I trigger some code when go back?

Answer 1

You can do it without giving up storyboard segues, but you nevertheless had to setup will/did Disappear handler in ViewCOntroller2:
class ViewController: UIViewController {
...
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let destination = segue.destination as? ViewController2 {
(segue.destination as? ViewController2).onViewWillDisappear = {
//Your code
}
}
}
}
class ViewController2: UIViewController {
var onViewWillDisappear: (()->())?
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
onViewWillDisappear?()
}
...
}

Answer 2

There are several ways to handle this operation. Here is one, which I used to use.
// ViewController1
class ViewController1: UIViewController {
#IBAction func presentOverCurrentContext(button: Button) {
let vc2 = // instantiate ViewController2
vc2.modalPresentationStyle = .overFullScreen
vc2.presentingVC = self // use this variable 'presentingVC' to connect both view controllers
self.present(vc2, animated: true)
}
}
// ViewController2
class ViewController2: UIViewController {
var presentingVC: UIViewController? // use this variable to connect both view controllers
#IBAction func close(button: Button) {
// handle operation here
presentingVC?.viewWillAppear(true)
self.dismiss(animated: true, completion: {
// or here
// presentingVC?.viewWillAppear(true)
})
}
}
You can also use, your own method to reload view/viewcontroller, but viewWillAppear is common accessible method for all view controllers (as part of super class life cycle) hence you may not need to specify custom type of view controller for presentingVC

Answer 3

While the answers so far provided do work I think it's a good idea to show how to do it using a protocol and delegate as that's a clean implementation which then also allows for further functionality to be added with minimal effort.
So set up a protocol like this:
protocol SecondViewControllerProtocol: class {
func closed(controller: SecondViewController)
}
Setup the second view controller like this:
class SecondViewController {
public weak var delegate: SecondViewControllerProtocol?
#IBAction func close(_ sender: Any) {
self.dismiss(animated: true, completion: nil)
self.delegate?.close(controller: self)
}
}
Setup the first view controller like this:
class FirstViewController: SecondViewControllerProtocol {
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "SecondViewControllerID",
let secondViewController = segue.destination as? SecondViewController {
secondViewController.delegate = self
}
}
func closed(controller: SecondViewController) {
// Any code you want to execute when the second view controller is dismissed
}
}
Implementing it like this does what the original request was and allows for extra methods to be put in the protocol so that the FirstViewController can respond to other actions in the SecondViewController.
Note:
You might want to move the delegate method call into the closure of the dismiss handler so that you know the method is not called until the SecondViewController is actually gone (in case you try to present another view which would fail). If that's the case you could do this:
#IBAction func close(_ sender: Any) {
self.dismiss(animated: true) {
self.delegate?.close(controller: self)
}
}
In fact you could have a will and did methods and call them like this:
#IBAction func close(_ sender: Any) {
self.delegate?.willClose(controller: self)
self.dismiss(animated: true) {
self.delegate?.didClose(controller: self)
}
}
Which would allow you to do something immediately while the second controller is animating away and then know when it has actually gone.

Answer 4

Best/Clean way to handle this scenario to use call back handler.
Example Code
typealias CloseActionHandler = ()-> Void
class TestController: UIViewController {
var closeActionHandler: CloseActionHandler?
func close(_ handler:#escaping CloseActionHandler) {
self.closeActionHandler = handler
}
#IBAction func closeButtonTapped(_ sender: Any) {
self.dismiss(animated: true, completion: nil)
self.closeActionHandler?()
}
}
class ViewController: UIViewController {
func loadTestController(viewController: TestController) {
viewController.close {
//will be called when user will tap on close button
}
}
}