How to dismiss message app in swift?

Question

Can you see that here : https://vimeo.com/279403383

I'm trying present a passcode view. Because this app is sensitive to security.

So if app did enter background, request passcode.

In this case pretty well work.

But, specific case work oddly.

func applicationDidEnterBackground(_ application: UIApplication) {
            guard let passcodeManageView = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "passcodeManageView") as? PasscodeManageViewController else { return }
            passcodeManageView.state = State.loginMode
            passcodeManageView.modalPresentationStyle = .overFullScreen

            var rootViewController = UIApplication.shared.keyWindow?.rootViewController
            while let presentController = rootViewController?.presentedViewController {
                rootViewController = presentController
            }
            rootViewController?.present(passcodeManageView, animated: false, completion: nil)
    }

So, my question is

1. How does passcode view cover MFMessageComposeViewController?

2. or How to dismiss MFMessageComposeViewController?

What is the best way???

Answer 1

You need to iterate the presented ViewControllers of your app and close them one by one.

func applicationDidEnterBackground(_ application: UIApplication) {  
    if let rootViewController = UIApplication.shared.keyWindow?.rootViewController {
      var  presented = rootViewController.presentedViewController
      while presented != nil
      {
        if presented is MFMessageComposeViewController {
          rootViewController.dismiss(animated: false, completion: nil)
          break
        } else {
           presented = presented?.presentedViewController
        }
      }

    }

    guard let passcodeManageView = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "passcodeManageView") as? PasscodeManageViewController else { return }
    passcodeManageView.state = State.loginMode
    passcodeManageView.modalPresentationStyle = .overFullScreen

    var rootViewController = UIApplication.shared.keyWindow?.rootViewController
    while let presentController = rootViewController?.presentedViewController {
      rootViewController = presentController
    }
    rootViewController?.present(passcodeManageView, animated: false, completion: nil)

}