Add announcement banner to messages view

Author: blewjy

Rocket.Chat.xcodeproj/project.pbxproj

@@ -895,6 +895,7 @@
 		D32E28251DFD86C300D6019C /* LauncherProtocol.swift in Sources */ = {isa = PBXBuildFile; fileRef = D32E28221DFD86C300D6019C /* LauncherProtocol.swift */; };
 		D32E28261DFD86C300D6019C /* PersistencyCoordinator.swift in Sources */ = {isa = PBXBuildFile; fileRef = D32E28231DFD86C300D6019C /* PersistencyCoordinator.swift */; };
 		D3CFAFBD1E907D8900BADC0A /* ChatMessageTextViewModel.swift in Sources */ = {isa = PBXBuildFile; fileRef = D3CFAFBC1E907D8900BADC0A /* ChatMessageTextViewModel.swift */; };
+		DB926AFD21FA0AEE0046F53F /* ChatAnnouncementView.swift in Sources */ = {isa = PBXBuildFile; fileRef = DB926AFC21FA0AEE0046F53F /* ChatAnnouncementView.swift */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXContainerItemProxy section */
@@ -1848,6 +1849,7 @@
 		D32E28221DFD86C300D6019C /* LauncherProtocol.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = LauncherProtocol.swift; sourceTree = "<group>"; };
 		D32E28231DFD86C300D6019C /* PersistencyCoordinator.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = PersistencyCoordinator.swift; sourceTree = "<group>"; };
 		D3CFAFBC1E907D8900BADC0A /* ChatMessageTextViewModel.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ChatMessageTextViewModel.swift; sourceTree = "<group>"; };
+		DB926AFC21FA0AEE0046F53F /* ChatAnnouncementView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ChatAnnouncementView.swift; sourceTree = "<group>"; };
 		E05A718A50D61E3E547007AF /* Pods-Rocket.Chat.test.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-Rocket.Chat.test.xcconfig"; path = "Pods/Target Support Files/Pods-Rocket.Chat/Pods-Rocket.Chat.test.xcconfig"; sourceTree = "<group>"; };
 		F87E8221BEB77AF190F06201 /* Pods-Rocket.Chat.ShareExtension.beta.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-Rocket.Chat.ShareExtension.beta.xcconfig"; path = "Pods/Target Support Files/Pods-Rocket.Chat.ShareExtension/Pods-Rocket.Chat.ShareExtension.beta.xcconfig"; sourceTree = "<group>"; };
 		FEDACA44BBB1C0633DEA6F3D /* Pods-Rocket.ChatTests.beta.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-Rocket.ChatTests.beta.xcconfig"; path = "Pods/Target Support Files/Pods-Rocket.ChatTests/Pods-Rocket.ChatTests.beta.xcconfig"; sourceTree = "<group>"; };
@@ -3028,6 +3030,7 @@
 				411498E21FC7A99C00D66542 /* ChatTitleViewModel.swift */,
 				339B6929205042D300F97392 /* KeyboardFrameView.swift */,
 				1435BFA21F9B601600FB2768 /* RCTextView.swift */,
+				DB926AFC21FA0AEE0046F53F /* ChatAnnouncementView.swift */,
 			);
 			path = Chat;
 			sourceTree = "<group>";
@@ -4827,6 +4830,7 @@
 				4190694321D0E82F00FE2573 /* MessageVideoCallCell.swift in Sources */,
 				9987B5992093E526007D277C /* FileTableViewCell.swift in Sources */,
 				99BE4D8A2153162A001A43E2 /* UnmanagedMessage.swift in Sources */,
+				DB926AFD21FA0AEE0046F53F /* ChatAnnouncementView.swift in Sources */,
 				41FC9E0C209B3BAA00FED485 /* UploadMessageRequest.swift in Sources */,
 				800FCD501F728EC800D9A692 /* MemberCell.swift in Sources */,
 				997FE19C210BA5B8000F6836 /* SubscriptionHideRequest.swift in Sources */,

Rocket.Chat/Controllers/Chat/MessagesViewController.swift

@@ -79,6 +79,12 @@ final class MessagesViewController: RocketChatViewController {
         }
     }
 
+    lazy var announcementBannerView: UIView = {
+        let announcementBannerView = ChatAnnouncementView()
+        announcementBannerView.subscription = subscription?.unmanaged
+        return announcementBannerView
+    }()
+
     private let buttonScrollToBottomSize = CGFloat(70)
     var keyboardHeight: CGFloat = 0
     var buttonScrollToBottomConstraint: NSLayoutConstraint!
@@ -131,7 +137,7 @@ final class MessagesViewController: RocketChatViewController {
 
         registerCells()
         setupScrollToBottom()
-
+        setupAnnouncementBanner()
         NotificationCenter.default.addObserver(
             self,
             selector: #selector(keyboardWillShow(_:)),
@@ -197,6 +203,7 @@ final class MessagesViewController: RocketChatViewController {
         super.viewDidAppear(animated)
         markAsRead()
         becomeFirstResponder()
+        updateAnnouncementBanner()
     }
 
     override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
@@ -274,6 +281,35 @@ final class MessagesViewController: RocketChatViewController {
         }
     }
 
+    // MARK: Announcement
+
+    func setupAnnouncementBanner() {
+        // Start as invisible first, alpha will be set to 1 if a valid announcement is fetched
+        announcementBannerView.alpha = 0
+
+        view.addSubview(announcementBannerView)
+        view.bringSubviewToFront(announcementBannerView)
+        NSLayoutConstraint.activate([
+            announcementBannerView.topAnchor.constraint(equalTo: view.topAnchor),
+            announcementBannerView.leftAnchor.constraint(equalTo: view.leftAnchor),
+            announcementBannerView.rightAnchor.constraint(equalTo: view.rightAnchor),
+            announcementBannerView.heightAnchor.constraint(equalToConstant: 50)
+        ])
+
+        announcementBannerView.applyTheme()
+    }
+
+    func updateAnnouncementBanner() {
+        guard let announcement = subscription?.unmanaged?.roomAnnouncement else { return }
+        let hasAnnouncement = announcement == "" ? false : true
+
+        if hasAnnouncement {
+            announcementBannerView.alpha = 1
+        } else {
+            announcementBannerView.alpha = 0
+        }
+    }
+
     // MARK: Scroll to Bottom
 
     func setupScrollToBottom() {

Rocket.Chat/Views/Chat/ChatAnnouncementView.swift

@@ -0,0 +1,61 @@
+//
+//  ChatAnnouncementView.swift
+//  Rocket.Chat
+//
+//  Created by Bryan Lew on 24/1/19.
+//  Copyright © 2019 Rocket.Chat. All rights reserved.
+//
+
+import UIKit
+
+final class ChatAnnouncementView: UIView {
+
+    override init(frame: CGRect) {
+        super.init(frame: frame)
+        setupUI()
+    }
+
+    required init?(coder aDecoder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+
+    var subscription: UnmanagedSubscription? {
+        didSet {
+            guard let subscription = subscription else { return }
+            guard let announcement = subscription.roomAnnouncement else { return }
+            let attributedString = NSAttributedString(string: announcement)
+            announcementLabel.attributedText = MarkdownManager.shared.transformAttributedString(attributedString)
+        }
+    }
+
+    let announcementLabel: UILabel = {
+        let label = UILabel()
+        label.textAlignment = .center
+        label.translatesAutoresizingMaskIntoConstraints = false
+        return label
+    }()
+
+    fileprivate func setupUI() {
+        translatesAutoresizingMaskIntoConstraints = false
+
+        addSubview(announcementLabel)
+        NSLayoutConstraint.activate([
+            announcementLabel.topAnchor.constraint(equalTo: topAnchor),
+            announcementLabel.bottomAnchor.constraint(equalTo: bottomAnchor),
+            announcementLabel.leftAnchor.constraint(equalTo: leftAnchor, constant: 12),
+            announcementLabel.rightAnchor.constraint(equalTo: rightAnchor, constant: -12)
+        ])
+    }
+}
+
+// MARK: Themeable
+
+extension ChatAnnouncementView {
+
+    override func applyTheme() {
+        super.applyTheme()
+        backgroundColor = theme?.bannerBackground
+        announcementLabel.textColor = theme?.auxiliaryText
+    }
+
+}