Dismissing keyboard only when scrolling down

Author: martinmitrevski

Sources/StreamChatSwiftUI/ChatChannel/ChatChannelViewModel.swift

@@ -135,9 +135,10 @@ open class ChatChannelViewModel: ObservableObject, MessagesDataSource {
     }
 
     public func scrollToLastMessage() {
-        if scrolledId != messages.first?.messageId {
-            scrolledId = messages.first?.messageId
+        if scrolledId != nil {
+            scrolledId = nil
         }
+        scrolledId = messages.first?.messageId
     }
 
     public func handleMessageAppear(index: Int) {

Sources/StreamChatSwiftUI/ChatChannel/MessageList/MessageListView.swift

@@ -150,11 +150,13 @@ public struct MessageListView<Factory: ViewFactory>: View, KeyboardReadable {
                 .onPreferenceChange(ScrollViewOffsetPreferenceKey.self) { value in
                     DispatchQueue.main.async {
                         let offsetValue = value ?? 0
+                        let diff = offsetValue - utils.messageCachingUtils.scrollOffset
+                        utils.messageCachingUtils.scrollOffset = offsetValue
                         let scrollButtonShown = offsetValue < -20
                         if scrollButtonShown != showScrollToLatestButton {
                             showScrollToLatestButton = scrollButtonShown
                         }
-                        if keyboardShown {
+                        if keyboardShown && diff < -20 {
                             keyboardShown = false
                             resignFirstResponder()
                         }

Sources/StreamChatSwiftUI/Utils/MessageCachingUtils.swift

@@ -4,6 +4,7 @@
 
 import Foundation
 import StreamChat
+import UIKit
 
 /// Caches messages related data to avoid accessing the database.
 /// Cleared on chat channel view dismiss or memory warning.
@@ -15,6 +16,8 @@ class MessageCachingUtils {
     private var checkedMessageIds = Set<String>()
     private var quotedMessageMapping = [String: ChatMessage]()
 
+    var scrollOffset: CGFloat = 0
+    
     func authorId(for message: ChatMessage) -> String {
         if let userDisplayInfo = userDisplayInfo(for: message) {
             return userDisplayInfo.id
@@ -72,6 +75,7 @@ class MessageCachingUtils {
 
     func clearCache() {
         log.debug("Clearing cached message data")
+        scrollOffset = 0
         messageAuthorMapping = [String: String]()
         messageAuthors = [String: UserDisplayInfo]()
         messageAttachments = [String: Bool]()