Implements #4693 - Alert users of Element on iOS11 deprecation.

Riot/Modules/Home/VersionCheck/HomeViewControllerWithBannerWrapperViewController.swift

@@ -0,0 +1,84 @@
+// 
+// Copyright 2021 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import Foundation
+
+class HomeViewControllerWithBannerWrapperViewController: UIViewController, BannerPresentationProtocol {
+    
+    @objc let homeViewController: HomeViewController
+    private var bannerContainerView: UIView!
+    private var stackView: UIStackView!
+    
+    init(viewController: HomeViewController) {
+        self.homeViewController = viewController
+        
+        super.init(nibName: nil, bundle: nil)
+        
+        self.tabBarItem.tag = viewController.tabBarItem.tag
+        self.tabBarItem.image = viewController.tabBarItem.image
+        self.accessibilityLabel = viewController.accessibilityLabel
+    }
+    
+    required init?(coder: NSCoder) {
+        fatalError("Not implemented")
+    }
+    
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        
+        view.backgroundColor = .clear
+        
+        stackView = UIStackView()
+        stackView.axis = .vertical
+        stackView.distribution = .fill
+        stackView.alignment = .fill
+        
+        view.vc_addSubViewMatchingParent(stackView)
+        
+        addChild(homeViewController)
+        stackView.addArrangedSubview(homeViewController.view)
+        homeViewController.didMove(toParent: self)
+    }
+    
+    // MARK: - BannerPresentationProtocol
+    
+    func presentBannerView(_ bannerView: UIView, animated: Bool) {
+        bannerView.alpha = 0.0
+        bannerView.isHidden = true
+        self.stackView.insertArrangedSubview(bannerView, at: 0)
+        self.stackView.layoutIfNeeded()
+        
+        UIView.animate(withDuration: (animated ? 0.25 : 0.0)) {
+            bannerView.alpha = 1.0
+            bannerView.isHidden = false
+            self.stackView.layoutIfNeeded()
+        }
+    }
+    
+    func dismissBannerView(animated: Bool) {
+        guard stackView.arrangedSubviews.count > 1, let bannerView = self.stackView.arrangedSubviews.first else {
+            return
+        }
+        
+        UIView.animate(withDuration: (animated ? 0.25 : 0.0)) {
+            bannerView.alpha = 0.0
+            bannerView.isHidden = true
+            self.stackView.layoutIfNeeded()
+        } completion: { _ in
+            bannerView.removeFromSuperview()
+        }
+    }
+}