39 lines
1.5 KiB
Swift
39 lines
1.5 KiB
Swift
//
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// TableViewCellHeightCacheableContainer.swift
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// Mastodon
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//
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// Created by MainasuK Cirno on 2021-3-3.
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//
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import UIKit
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protocol TableViewCellHeightCacheableContainer {
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var cellFrameCache: NSCache<NSNumber, NSValue> { get }
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func cacheTableView(_ tableView: UITableView, didEndDisplaying cell: UITableViewCell, forRowAt indexPath: IndexPath)
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func handleTableView(_ tableView: UITableView, estimatedHeightForRowAt indexPath: IndexPath) -> CGFloat
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}
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extension TableViewCellHeightCacheableContainer where Self: StatusProvider {
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func cacheTableView(_ tableView: UITableView, didEndDisplaying cell: UITableViewCell, forRowAt indexPath: IndexPath) {
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guard let item = item(for: nil, indexPath: indexPath) else { return }
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let key = item.hashValue
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let frame = cell.frame
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cellFrameCache.setObject(NSValue(cgRect: frame), forKey: NSNumber(value: key))
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}
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func handleTableView(_ tableView: UITableView, estimatedHeightForRowAt indexPath: IndexPath) -> CGFloat {
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guard let item = item(for: nil, indexPath: indexPath) else { return UITableView.automaticDimension }
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guard let frame = cellFrameCache.object(forKey: NSNumber(value: item.hashValue))?.cgRectValue else {
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if case .bottomLoader = item {
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return TimelineLoaderTableViewCell.cellHeight
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} else {
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return UITableView.automaticDimension
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}
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}
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return ceil(frame.height)
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}
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}
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