Observe inputBar frame change to update collectionView bottom inset

CHANGELOG.md

@@ -35,6 +35,7 @@ See [MIGRATION_GUIDE.md](https://github.com/MessageKit/MessageKit/blob/main/Docu
     MessageSizeCalculator.messageContainerSize(for message: MessageType, at indexPath: IndexPath) -> CGSize
     ```
 - Updated InputBarAccessoryView to v6.1.0 [#1716](https://github.com/MessageKit/MessageKit/pull/1716) by [@martinpucik](https://github.com/martinpucik)
+- Observe inputBar frame change to update collectionView bottom inset instead of keyboard show/hide notifications [#1726](https://github.com/MessageKit/MessageKit/pull/1726) by [@martinpucik](https://github.com/martinpucik)
 
 ### Fixed
 

Sources/Controllers/MessagesViewController+Keyboard.swift

@@ -35,10 +35,12 @@ internal extension MessagesViewController {
         keyboardManager.bind(inputAccessoryView: inputContainerView)
         keyboardManager.bind(to: messagesCollectionView)
 
-        /// Observe didBeginEditing to scroll down the content
+        /// Observe didBeginEditing to scroll content to last item if necessary
         NotificationCenter.default
             .publisher(for: UITextView.textDidBeginEditingNotification)
             .subscribe(on: DispatchQueue.global())
+            /// Wait for inputBar frame change animation to end
+            .delay(for: .milliseconds(200), scheduler: DispatchQueue.main)
             .receive(on: DispatchQueue.main)
             .sink { [weak self] notification in
                 self?.handleTextViewDidBeginEditing(notification)
@@ -65,19 +67,10 @@ internal extension MessagesViewController {
             }
             .store(in: &disposeBag)
 
-        Publishers.MergeMany(
-            NotificationCenter.default.publisher(for: UIResponder.keyboardWillHideNotification),
-            NotificationCenter.default.publisher(for: UIResponder.keyboardWillShowNotification)
-        )
-        .subscribe(on: DispatchQueue.global())
-        .receive(on: DispatchQueue.main)
-        .sink(receiveValue: { [weak self] _ in
-            self?.updateMessageCollectionViewBottomInset()
-        })
-        .store(in: &disposeBag)
-
-        /// Observe frame change of the input bar container to not cover collectioView with inputBar
+        /// Observe frame change of the input bar container to update collectioView bottom inset
         inputContainerView.publisher(for: \.center)
+            .receive(on: DispatchQueue.main)
+            .removeDuplicates()
             .sink(receiveValue: { [weak self] _ in
                 self?.updateMessageCollectionViewBottomInset()
             })
@@ -88,8 +81,6 @@ internal extension MessagesViewController {
 
     /// Updates bottom messagesCollectionView inset based on the position of inputContainerView
     func updateMessageCollectionViewBottomInset() {
-        /// This is important to skip notifications from child modal controllers in iOS >= 13.0
-        guard self.presentedViewController == nil else { return }
         let collectionViewHeight = messagesCollectionView.frame.height
         let newBottomInset = collectionViewHeight - (inputContainerView.frame.minY - additionalBottomInset) - automaticallyAddedBottomInset
         let normalizedNewBottomInset = max(0, newBottomInset)