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

Riot/Modules/Home/VersionCheck/VersionCheckBannerView.swift

@@ -0,0 +1,74 @@
+// 
+// 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 UIKit
+import Reusable
+
+protocol VersionCheckBannerViewDelegate: AnyObject {
+    func bannerViewDidRequestDismissal(_ bannerView: VersionCheckBannerView)
+    func bannerViewDidRequestInteraction(_ bannerView: VersionCheckBannerView)
+}
+
+struct VersionCheckBannerViewDetails {
+    let title: String
+    let subtitle: String
+}
+
+class VersionCheckBannerView: UIView, NibLoadable, Themable {
+    
+    @IBOutlet private var titleLabel: UILabel!
+    @IBOutlet private var subtitleLabel: UILabel!
+    
+    @IBOutlet private var infoButton: UIButton!
+    @IBOutlet private var dismissButton: UIButton!
+    
+    weak var delegate: VersionCheckBannerViewDelegate?
+    
+    override func awakeFromNib() {
+        super.awakeFromNib()
+        
+        let tapGestureRecognizer = UITapGestureRecognizer()
+        tapGestureRecognizer.addTarget(self, action: #selector(handleTapGesture))
+        self.addGestureRecognizer(tapGestureRecognizer)
+    }
+    
+    func configureWithDetails(_ details: VersionCheckBannerViewDetails) {
+        titleLabel.text = details.title
+        subtitleLabel.text = details.subtitle
+    }
+    
+    // MARK: - Themable
+    
+    func update(theme: Theme) {
+        backgroundColor = theme.colors.background
+        
+        titleLabel.textColor = theme.colors.primaryContent
+        subtitleLabel.textColor = theme.colors.secondaryContent
+        
+        infoButton.tintColor = theme.colors.primaryContent
+        dismissButton.tintColor = theme.colors.secondaryContent
+    }
+    
+    // MARK: - Private
+    
+    @IBAction private func onDismissButtonTap(_ sender: UIButton) {
+        delegate?.bannerViewDidRequestDismissal(self)
+    }
+    
+    @objc private func handleTapGesture(_ gestureRecognizer: UITapGestureRecognizer) {
+        delegate?.bannerViewDidRequestInteraction(self)
+    }
+}