Add paginated panel loading

ios/Sources/Support.swift

@@ -29,6 +29,12 @@ extension UIViewController {
 class RefreshingTableViewController: UITableViewController {
     private let spinner = UIActivityIndicatorView(style: .medium)
     var loadingTask: Task<Void, Never>?
+    private lazy var moreButton = UIButton(
+        configuration: .plain(),
+        primaryAction: UIAction { [weak self] _ in self?.requestMoreContent() }
+    )
+    private var hasMoreContent = false
+    private var loadingMore = false
 
     init() {
         super.init(style: .plain)
@@ -46,6 +52,8 @@ class RefreshingTableViewController: UITableViewController {
 
     func loadContent(refreshing: Bool) {}
 
+    func loadMoreContent() {}
+
     func beginLoading(refreshing: Bool) {
         if !refreshing { beginNavigationLoading(spinner) }
     }
@@ -55,6 +63,58 @@ class RefreshingTableViewController: UITableViewController {
         refreshControl?.endRefreshing()
     }
 
+    func resetPagination() {
+        hasMoreContent = false
+        loadingMore = false
+        tableView.tableFooterView = nil
+    }
+
+    func finishPagination(hasMore: Bool) {
+        hasMoreContent = hasMore
+        loadingMore = false
+        var configuration = moreButton.configuration
+        configuration?.title = "Pull up or tap to load more"
+        configuration?.showsActivityIndicator = false
+        moreButton.configuration = configuration
+        moreButton.accessibilityLabel = "Load more results"
+        tableView.tableFooterView = hasMore ? paginationFooter() : nil
+    }
+
+    func failPagination() {
+        loadingMore = false
+        finishPagination(hasMore: hasMoreContent)
+    }
+
+    override func scrollViewDidScroll(_ scrollView: UIScrollView) {
+        guard scrollView.isDragging, hasMoreContent, !loadingMore else { return }
+        let bottom = max(
+            -scrollView.adjustedContentInset.top,
+            scrollView.contentSize.height
+                + scrollView.adjustedContentInset.bottom
+                - scrollView.bounds.height
+        )
+        if scrollView.contentOffset.y > bottom + 60 { requestMoreContent() }
+    }
+
+    private func requestMoreContent() {
+        guard hasMoreContent, !loadingMore else { return }
+        loadingMore = true
+        var configuration = moreButton.configuration
+        configuration?.title = "Loading more…"
+        configuration?.showsActivityIndicator = true
+        moreButton.configuration = configuration
+        moreButton.accessibilityLabel = "Loading more results"
+        loadMoreContent()
+    }
+
+    private func paginationFooter() -> UIView {
+        let footer = UIView(frame: CGRect(x: 0, y: 0, width: tableView.bounds.width, height: 56))
+        moreButton.frame = footer.bounds
+        moreButton.autoresizingMask = [.flexibleWidth, .flexibleHeight]
+        footer.addSubview(moreButton)
+        return footer
+    }
+
     @objc private func refreshRequested() {
         loadContent(refreshing: true)
     }