39 lines
1.3 KiB
Swift
39 lines
1.3 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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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 = UIApplication.shared.keyWindow!.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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