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Video Feed List

Overview​

The Video Feed List (LMFeedVideoListScreen) provides a vertical scrolling interface for displaying video content in a feed format. It supports video playback, user interactions, and post management features.

File Location:
LMFeedVideoListScreen.swift

Functionality​

Protocols Implemented​

LMFeedVideoListViewModelProtocol​

Defines methods that are triggered from the view model and are implemented by the view controller using it

  • showActivityLoader(): Called to display the activity loader.
  • showHideFooterLoader(isShow: Bool): Called to show or hide the footer loader.
  • updateVideoList(with posts: [LMFeedPostContentModel], isInitialPage: Bool): Called to update the video list with new posts.
  • navigateToReportScreen(for postID: String, creatorUUID: String): Called when tapped on report button to navigate to the report screen.
  • navigateToDeleteScreen(for postID: String): Called when tapped on delete button to navigate to the delete screen.
  • navigateToEditScreen(for postID: String): Called when tapped on edit button to navigate to the edit video post screen.

LMFeedPostHeaderViewProtocol​

Defines methods for handling post header interactions.

LMFeedPostFooterViewProtocol​

Defines methods for handling post footer interactions.

LMFeedVideoTextCellHeightDelegate​

Defines methods for handling text cell height changes

  • videoTextCell(_ cell: LMFeedVideoTextCell, didChangeHeight height: CGFloat): Called when the text cell's height changes.

UI Components​

  • videoCollectionView: A collection view for displaying video content in a vertical scrolling format.
  • createPostLoaderView: A view for displaying post creation progress.
  • taggingView: A view for displaying and selecting mentioned users.
  • inputTextView: A text view for entering comments with user mention support.
  • header: A view displaying post author information and post metadata.
  • footer: A view containing post interaction buttons (like, comment, share).
  • textCell: A cell displaying post text content with expandable functionality.
  • videoCollectionCell: A cell for displaying video content with playback controls.
  • videoListEndPage: A view displayed when reaching the end of the video feed.

Data Variables​

  • viewModel: An instance of LMFeedVideoListViewModel managing the feed's business logic.
  • data: An array of LMFeedPostContentModel objects containing post data.
  • taggingViewHeight: A constraint for the tagging view's height.
  • inputTextViewHeightConstraint: A constraint for the input text view's height.
  • textInputMinimumHeight: The minimum height of the input text view.
  • textInputMaximumHeight: The maximum height of the input text view.

Methods​

  • setupViews(): Configures the initial view hierarchy.
  • setupLayouts(): Sets up the layout constraints for all UI components.
  • setupActions(): Configures action handlers for UI elements.
  • setupAppearance(): Customizes the visual appearance of the screen.
  • updatePostList(with:isInitialPage:): Updates the post list with new content.
  • updatePost(with:onlyHeader:onlyFooter:): Updates a specific post's content.
  • handleVideoPlayback(): Manages video playback for visible cells.
  • configureEmptyListView(): Sets up the empty state view.

Action Handlers​

  • didTapViewOldPosts(): Called when the "View Old Posts" button is tapped.
  • postUpdated(notification:): Handles post update notifications.
  • postDelete(notification:): Handles post deletion notifications.

Customization​

CustomVideoListScreen.swift
class CustomVideoListScreen: LMFeedVideoListScreen {
    override func setupAppearance() {
        super.setupAppearance()
        videoCollectionView.backgroundColor = .systemBackground
        inputTextView.backgroundColor = .secondarySystemBackground
    }
}
AppDelegate.swift
func application(_ application: UIApplication, willFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]? = nil) -> Bool {
    Components.shared.videoListScreen = CustomVideoListScreen.self
    // ...
    return true
}