48 lines
2.2 KiB
Swift
48 lines
2.2 KiB
Swift
//
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// Copyright (c) 2015 Max Sokolov https://twitter.com/max_sokolov
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy of
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// this software and associated documentation files (the "Software"), to deal in
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// the Software without restriction, including without limitation the rights to
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// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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// the Software, and to permit persons to whom the Software is furnished to do so,
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// subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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import UIKit
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public protocol HeightStrategy {
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var tableView: UITableView? { get set }
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func height<Item, Cell: ConfigurableCell where Cell.T == Item, Cell: UITableViewCell>(item: Item, indexPath: NSIndexPath, cell: Cell.Type) -> CGFloat
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}
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public class PrototypeHeightStrategy: HeightStrategy {
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public weak var tableView: UITableView?
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private var cachedHeights = [Int: CGFloat]()
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public func height<Item, Cell: ConfigurableCell where Cell.T == Item, Cell: UITableViewCell>(item: Item, indexPath: NSIndexPath, cell: Cell.Type) -> CGFloat {
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guard let cell = tableView?.dequeueReusableCellWithIdentifier(Cell.reusableIdentifier()) as? Cell else { return 0 }
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cell.bounds = CGRectMake(0, 0, tableView?.bounds.size.width ?? 0, cell.bounds.height)
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cell.configure(item)
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cell.setNeedsLayout()
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cell.layoutIfNeeded()
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return cell.contentView.systemLayoutSizeFittingSize(UILayoutFittingCompressedSize).height + 1
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}
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} |