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Add AccurateCellHeightCalculator

This commit is contained in:
Ivan Zinovyev 2018-11-04 08:28:50 +03:00
parent 1c92c14a1a
commit 86f07b8e7c
2 changed files with 49 additions and 0 deletions
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45
Sources/AccurateCellHeightCalculator.swift Normal file
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@ -0,0 +1,45 @@
import UIKit
class AccurateCellHeightCalculator: RowHeightCalculator {
private(set) weak var tableView: UITableView?
private var prototypes = [String: UITableViewCell]()
private var cachedHeights = [Int: CGFloat]()
public init(tableView: UITableView?) {
self.tableView = tableView
}
open func height(forRow row: Row, at indexPath: IndexPath) -> CGFloat {
guard let tableView = tableView else { return 0 }
let hash = row.hashValue ^ Int(tableView.bounds.size.width).hashValue
if let height = cachedHeights[hash] {
return height
}
var prototypeCell = prototypes[row.reuseIdentifier]
if prototypeCell == nil {
prototypeCell = tableView.dequeueReusableCell(withIdentifier: row.reuseIdentifier)
prototypes[row.reuseIdentifier] = prototypeCell
}
guard let cell = prototypeCell else { return 0 }
let height = row.height(for: cell)
cachedHeights[hash] = height
return height
}
open func estimatedHeight(forRow row: Row, at indexPath: IndexPath) -> CGFloat {
return height(forRow: row, at: indexPath)
}
open func invalidate() {
cachedHeights.removeAll()
}
}

4
TableKit.xcodeproj/project.pbxproj
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@ -7,6 +7,7 @@
objects = {
/* Begin PBXBuildFile section */
320C5280218EB9A7004EAD1C /* AccurateCellHeightCalculator.swift in Sources */ = {isa = PBXBuildFile; fileRef = 320C527F218EB9A7004EAD1C /* AccurateCellHeightCalculator.swift */; };
50CF6E6B1D6704FE004746FF /* TableCellRegisterer.swift in Sources */ = {isa = PBXBuildFile; fileRef = 50CF6E6A1D6704FE004746FF /* TableCellRegisterer.swift */; };
50E858581DB153F500A9AA55 /* TableKit.swift in Sources */ = {isa = PBXBuildFile; fileRef = 50E858571DB153F500A9AA55 /* TableKit.swift */; };
DA9EA7AF1D0EC2C90021F650 /* ConfigurableCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = DA9EA7A61D0EC2C90021F650 /* ConfigurableCell.swift */; };
@ -32,6 +33,7 @@
/* End PBXContainerItemProxy section */
/* Begin PBXFileReference section */
320C527F218EB9A7004EAD1C /* AccurateCellHeightCalculator.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AccurateCellHeightCalculator.swift; sourceTree = "<group>"; };
50CF6E6A1D6704FE004746FF /* TableCellRegisterer.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = TableCellRegisterer.swift; sourceTree = "<group>"; };
50E858571DB153F500A9AA55 /* TableKit.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = TableKit.swift; sourceTree = "<group>"; };
DA9EA7561D0B679A0021F650 /* TableKit.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = TableKit.framework; sourceTree = BUILT_PRODUCTS_DIR; };
@ -100,6 +102,7 @@
DA9EA7A71D0EC2C90021F650 /* TablePrototypeCellHeightCalculator.swift */,
DA9EA7A61D0EC2C90021F650 /* ConfigurableCell.swift */,
DA9EA7A81D0EC2C90021F650 /* Operators.swift */,
320C527F218EB9A7004EAD1C /* AccurateCellHeightCalculator.swift */,
);
path = Sources;
sourceTree = "<group>";
@ -233,6 +236,7 @@
50CF6E6B1D6704FE004746FF /* TableCellRegisterer.swift in Sources */,
DA9EA7AF1D0EC2C90021F650 /* ConfigurableCell.swift in Sources */,
DA9EA7B31D0EC2C90021F650 /* TableDirector.swift in Sources */,
320C5280218EB9A7004EAD1C /* AccurateCellHeightCalculator.swift in Sources */,
DA9EA7B71D0EC2C90021F650 /* TableSection.swift in Sources */,
DA9EA7B01D0EC2C90021F650 /* TablePrototypeCellHeightCalculator.swift in Sources */,
DA9EA7B51D0EC2C90021F650 /* TableRowAction.swift in Sources */,