Add Expandable protocol to expand/collapse cells
This commit is contained in:
Ivan Zinovyev
parent
921e2b42b3
commit
6eaf2cf3a2
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@ -25,7 +25,10 @@ public protocol ConfigurableCell {
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associatedtype CellData
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static var reuseIdentifier: String { get }
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@available(*, deprecated, message: "For static cells use defaultHeight, height of self-sized cells will be calculated automatically")
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static var estimatedHeight: CGFloat? { get }
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static var defaultHeight: CGFloat? { get }
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func configure(with _: CellData)
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@ -0,0 +1,54 @@
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import UIKit
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public protocol Expandable {
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associatedtype ViewModelType: ExpandableCellViewModel
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var viewModel: ViewModelType? { get }
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func configureAppearance(isCollapsed: Bool)
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}
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extension Expandable where Self: UITableViewCell & ConfigurableCell {
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public func toggleState(animated: Bool = true,
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animationDuration: TimeInterval = 0.3) {
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guard let tableView = tableView,
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let viewModel = viewModel else {
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return
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}
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let contentOffset = tableView.contentOffset
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if animated {
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UIView.animate(withDuration: animationDuration,
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animations: { [weak self] in
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self?.applyChanges(isCollapsed: !viewModel.isCollapsed)
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}, completion: { _ in
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viewModel.isCollapsed.toggle()
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})
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} else {
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applyChanges(isCollapsed: !viewModel.isCollapsed)
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viewModel.isCollapsed.toggle()
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}
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tableView.beginUpdates()
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tableView.endUpdates()
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tableView.setContentOffset(contentOffset, animated: false)
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}
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private func applyChanges(isCollapsed: Bool) {
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configureAppearance(isCollapsed: isCollapsed)
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layoutIfNeeded()
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if let indexPath = indexPath,
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let tableDirector = (tableView?.delegate as? TableDirector),
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let cellHeightCalculator = tableDirector.rowHeightCalculator as? ExpandableCellHeightCalculator {
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cellHeightCalculator.updateCached(height: height, for: indexPath)
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}
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}
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}
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@ -0,0 +1,55 @@
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import UIKit
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public final class ExpandableCellHeightCalculator: RowHeightCalculator {
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private(set) weak var tableView: UITableView?
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private var prototypes = [String: UITableViewCell]()
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private var cachedHeights = [IndexPath: CGFloat]()
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public init(tableView: UITableView?) {
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self.tableView = tableView
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}
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public func updateCached(height: CGFloat, for indexPath: IndexPath) {
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cachedHeights[indexPath] = height
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}
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public func height(forRow row: Row, at indexPath: IndexPath) -> CGFloat {
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guard let tableView = tableView else {
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return 0
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}
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if let height = cachedHeights[indexPath] {
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return height
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}
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var prototypeCell = prototypes[row.reuseIdentifier]
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if prototypeCell == nil {
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prototypeCell = tableView.dequeueReusableCell(withIdentifier: row.reuseIdentifier)
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prototypes[row.reuseIdentifier] = prototypeCell
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}
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guard let cell = prototypeCell else {
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return 0
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}
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row.configure(cell)
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cell.layoutIfNeeded()
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let height = cell.height
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cachedHeights[indexPath] = height
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return height
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}
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public func estimatedHeight(forRow row: Row, at indexPath: IndexPath) -> CGFloat {
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return height(forRow: row, at: indexPath)
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}
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public func invalidate() {
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cachedHeights.removeAll()
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}
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}
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@ -0,0 +1,5 @@
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public protocol ExpandableCellViewModel: class {
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var isCollapsed: Bool { get set }
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}
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@ -0,0 +1,27 @@
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import UIKit
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extension UITableViewCell {
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public var tableView: UITableView? {
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var view = superview
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while view != nil && !(view is UITableView) {
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view = view?.superview
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}
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return view as? UITableView
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}
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public var indexPath: IndexPath? {
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guard let indexPath = tableView?.indexPath(for: self) else {
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return nil
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}
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return indexPath
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}
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public var height: CGFloat {
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return contentView.systemLayoutSizeFitting(UIView.layoutFittingCompressedSize).height
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}
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}
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@ -7,6 +7,10 @@
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objects = {
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/* Begin PBXBuildFile section */
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3201E78421BE9DE1001DF9E7 /* ExpandableCellHeightCalculator.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3201E78321BE9DE1001DF9E7 /* ExpandableCellHeightCalculator.swift */; };
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3201E78621BE9E25001DF9E7 /* UITableViewCell+Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3201E78521BE9E25001DF9E7 /* UITableViewCell+Extensions.swift */; };
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3201E78821BE9EB2001DF9E7 /* Expandable.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3201E78721BE9EB2001DF9E7 /* Expandable.swift */; };
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3201E78A21BE9ED4001DF9E7 /* ExpandableCellViewModel.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3201E78921BE9ED4001DF9E7 /* ExpandableCellViewModel.swift */; };
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320C5280218EB9A7004EAD1C /* AccurateCellHeightCalculator.swift in Sources */ = {isa = PBXBuildFile; fileRef = 320C527F218EB9A7004EAD1C /* AccurateCellHeightCalculator.swift */; };
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50CF6E6B1D6704FE004746FF /* TableCellRegisterer.swift in Sources */ = {isa = PBXBuildFile; fileRef = 50CF6E6A1D6704FE004746FF /* TableCellRegisterer.swift */; };
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50E858581DB153F500A9AA55 /* TableKit.swift in Sources */ = {isa = PBXBuildFile; fileRef = 50E858571DB153F500A9AA55 /* TableKit.swift */; };
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@ -33,6 +37,10 @@
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/* End PBXContainerItemProxy section */
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/* Begin PBXFileReference section */
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3201E78321BE9DE1001DF9E7 /* ExpandableCellHeightCalculator.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ExpandableCellHeightCalculator.swift; sourceTree = "<group>"; };
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3201E78521BE9E25001DF9E7 /* UITableViewCell+Extensions.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "UITableViewCell+Extensions.swift"; sourceTree = "<group>"; };
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3201E78721BE9EB2001DF9E7 /* Expandable.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Expandable.swift; sourceTree = "<group>"; };
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3201E78921BE9ED4001DF9E7 /* ExpandableCellViewModel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ExpandableCellViewModel.swift; sourceTree = "<group>"; };
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320C527F218EB9A7004EAD1C /* AccurateCellHeightCalculator.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AccurateCellHeightCalculator.swift; sourceTree = "<group>"; };
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50CF6E6A1D6704FE004746FF /* TableCellRegisterer.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = TableCellRegisterer.swift; sourceTree = "<group>"; };
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50E858571DB153F500A9AA55 /* TableKit.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = TableKit.swift; sourceTree = "<group>"; };
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@ -92,17 +100,21 @@
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DA9EA7A51D0EC2B90021F650 /* Sources */ = {
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isa = PBXGroup;
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children = (
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50E858571DB153F500A9AA55 /* TableKit.swift */,
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DA9EA7AA1D0EC2C90021F650 /* TableDirector.swift */,
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320C527F218EB9A7004EAD1C /* AccurateCellHeightCalculator.swift */,
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DA9EA7A61D0EC2C90021F650 /* ConfigurableCell.swift */,
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3201E78321BE9DE1001DF9E7 /* ExpandableCellHeightCalculator.swift */,
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DA9EA7A81D0EC2C90021F650 /* Operators.swift */,
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DA9EA7A91D0EC2C90021F650 /* TableCellAction.swift */,
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50CF6E6A1D6704FE004746FF /* TableCellRegisterer.swift */,
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DA9EA7AA1D0EC2C90021F650 /* TableDirector.swift */,
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50E858571DB153F500A9AA55 /* TableKit.swift */,
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DA9EA7A71D0EC2C90021F650 /* TablePrototypeCellHeightCalculator.swift */,
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DA9EA7AB1D0EC2C90021F650 /* TableRow.swift */,
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DA9EA7AC1D0EC2C90021F650 /* TableRowAction.swift */,
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DA9EA7AE1D0EC2C90021F650 /* TableSection.swift */,
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DA9EA7A91D0EC2C90021F650 /* TableCellAction.swift */,
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DA9EA7A71D0EC2C90021F650 /* TablePrototypeCellHeightCalculator.swift */,
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DA9EA7A61D0EC2C90021F650 /* ConfigurableCell.swift */,
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DA9EA7A81D0EC2C90021F650 /* Operators.swift */,
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320C527F218EB9A7004EAD1C /* AccurateCellHeightCalculator.swift */,
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3201E78521BE9E25001DF9E7 /* UITableViewCell+Extensions.swift */,
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3201E78721BE9EB2001DF9E7 /* Expandable.swift */,
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3201E78921BE9ED4001DF9E7 /* ExpandableCellViewModel.swift */,
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);
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path = Sources;
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sourceTree = "<group>";
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@ -233,14 +245,18 @@
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isa = PBXSourcesBuildPhase;
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buildActionMask = 2147483647;
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files = (
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3201E78A21BE9ED4001DF9E7 /* ExpandableCellViewModel.swift in Sources */,
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50CF6E6B1D6704FE004746FF /* TableCellRegisterer.swift in Sources */,
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DA9EA7AF1D0EC2C90021F650 /* ConfigurableCell.swift in Sources */,
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DA9EA7B31D0EC2C90021F650 /* TableDirector.swift in Sources */,
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3201E78821BE9EB2001DF9E7 /* Expandable.swift in Sources */,
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320C5280218EB9A7004EAD1C /* AccurateCellHeightCalculator.swift in Sources */,
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DA9EA7B71D0EC2C90021F650 /* TableSection.swift in Sources */,
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DA9EA7B01D0EC2C90021F650 /* TablePrototypeCellHeightCalculator.swift in Sources */,
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3201E78421BE9DE1001DF9E7 /* ExpandableCellHeightCalculator.swift in Sources */,
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DA9EA7B51D0EC2C90021F650 /* TableRowAction.swift in Sources */,
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DA9EA7B21D0EC2C90021F650 /* TableCellAction.swift in Sources */,
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3201E78621BE9E25001DF9E7 /* UITableViewCell+Extensions.swift in Sources */,
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DA9EA7B11D0EC2C90021F650 /* Operators.swift in Sources */,
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DA9EA7B41D0EC2C90021F650 /* TableRow.swift in Sources */,
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50E858581DB153F500A9AA55 /* TableKit.swift in Sources */,
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