72 lines
3.0 KiB
Swift
72 lines
3.0 KiB
Swift
//
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// EnhancedTableViewController.swift
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// Tusker
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//
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// Created by Shadowfacts on 11/10/18.
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// Copyright © 2018 Shadowfacts. All rights reserved.
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//
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import UIKit
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import SafariServices
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class EnhancedTableViewController: UITableViewController {
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var prevScrollToTopOffset: CGPoint? = nil
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private var topOffset: CGPoint {
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// when scrolled to top, the content offset is negative the height of the UI above the scroll view (i.e. the nav and status bars)
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let windowScene = view.window!.windowScene!
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let barOffset = -1 * (navigationController!.navigationBar.frame.height + windowScene.statusBarManager!.statusBarFrame.height)
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// add one so it's not technically all the way at the top, and scrollViewWShouldScrollToTop is still called to trigger undo
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return CGPoint(x: 0, y: barOffset + 1)
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}
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override func scrollViewShouldScrollToTop(_ scrollView: UIScrollView) -> Bool {
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if let offset = prevScrollToTopOffset {
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tableView.setContentOffset(offset, animated: true)
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prevScrollToTopOffset = nil
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} else {
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prevScrollToTopOffset = tableView.contentOffset
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tableView.setContentOffset(topOffset, animated: true)
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}
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return false
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}
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override func scrollViewWillBeginDragging(_ scrollView: UIScrollView) {
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prevScrollToTopOffset = nil
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}
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}
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extension EnhancedTableViewController {
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override func tableView(_ tableView: UITableView, contextMenuConfigurationForRowAt indexPath: IndexPath, point: CGPoint) -> UIContextMenuConfiguration? {
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if let cell = tableView.cellForRow(at: indexPath) as? UITableViewCell & MenuPreviewProvider {
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let cellLocation = cell.convert(point, from: tableView)
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guard let (previewProvider, actionsProvider) = cell.getPreviewProviders(for: cellLocation, sourceViewController: self) else {
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return nil
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}
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let actionProvider: UIContextMenuActionProvider = { (elements) in
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return UIMenu(title: "", image: nil, identifier: nil, options: [], children: elements + actionsProvider())
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}
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return UIContextMenuConfiguration(identifier: nil, previewProvider: previewProvider, actionProvider: actionProvider)
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} else {
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return nil
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}
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}
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override func tableView(_ tableView: UITableView, willPerformPreviewActionForMenuWith configuration: UIContextMenuConfiguration, animator: UIContextMenuInteractionCommitAnimating) {
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if let viewController = animator.previewViewController {
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animator.preferredCommitStyle = .pop
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animator.addCompletion {
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if viewController is LargeImageViewController || viewController is GalleryViewController || viewController is SFSafariViewController {
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self.present(viewController, animated: true)
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} else {
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self.show(viewController, sender: nil)
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}
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}
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}
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}
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}
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