mirror of
https://github.com/Instagram/IGListKit
synced 2026-05-17 22:38:19 +00:00
79348164a7
Summary: Started work on the plane to get this moving since #418 is up and ready to land. We'll likely need to spend some time fleshing out the API of this, and I think I'll split it up into a couple different PRs once ready for review. Putting this up now to get early feedback. This adds an auto-diffing section controller as outlined in #38. There are several key parts: - Subclass a new section controller `IGListAutoSectionController` (naming wip) - Connect a data source - Implement the data source methods that do 3 things: - Given a top-level object, transform it into an array of **diffable** view models - Given a view model, return a cell - Given a view model, return a size for a cell - A new protocol for the cell `IGListBindable` so that we can control when the cell is updated w/ the view model. - The most important part of this is that it unlocks moving and reloading a cell, which you can't do w/ `UICollectionView` - [ ] Unit test `reloadObjects:` - [x] Add Closes https://github.com/Instagram/IGListKit/pull/494 Reviewed By: amonshiz Differential Revision: D4696966 Pulled By: rnystrom fbshipit-source-id: f21b8341b3ed4389f2a4a106d0d316f481ba6943
84 lines
2.9 KiB
Swift
84 lines
2.9 KiB
Swift
/**
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Copyright (c) 2016-present, Facebook, Inc. All rights reserved.
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The examples provided by Facebook are for non-commercial testing and evaluation
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purposes only. Facebook reserves all rights not expressly granted.
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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,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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FACEBOOK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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import UIKit
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import IGListKit
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final class LabelCell: UICollectionViewCell {
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fileprivate static let insets = UIEdgeInsets(top: 8, left: 15, bottom: 8, right: 15)
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fileprivate static let font = UIFont.systemFont(ofSize: 17)
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static var singleLineHeight: CGFloat {
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return font.lineHeight + insets.top + insets.bottom
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}
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static func textHeight(_ text: String, width: CGFloat) -> CGFloat {
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let constrainedSize = CGSize(width: width - insets.left - insets.right, height: CGFloat.greatestFiniteMagnitude)
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let attributes = [ NSFontAttributeName: font ]
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let options: NSStringDrawingOptions = [.usesFontLeading, .usesLineFragmentOrigin]
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let bounds = (text as NSString).boundingRect(with: constrainedSize, options: options, attributes: attributes, context: nil)
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return ceil(bounds.height) + insets.top + insets.bottom
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}
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let label: UILabel = {
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let label = UILabel()
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label.backgroundColor = .clear
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label.numberOfLines = 0
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label.font = LabelCell.font
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return label
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}()
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let separator: CALayer = {
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let layer = CALayer()
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layer.backgroundColor = UIColor(red: 200/255.0, green: 199/255.0, blue: 204/255.0, alpha: 1).cgColor
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return layer
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}()
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override init(frame: CGRect) {
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super.init(frame: frame)
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contentView.addSubview(label)
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contentView.layer.addSublayer(separator)
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contentView.backgroundColor = .white
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}
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required init?(coder aDecoder: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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override func layoutSubviews() {
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super.layoutSubviews()
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let bounds = contentView.bounds
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label.frame = UIEdgeInsetsInsetRect(bounds, LabelCell.insets)
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let height: CGFloat = 0.5
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let left = LabelCell.insets.left
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separator.frame = CGRect(x: left, y: bounds.height - height, width: bounds.width - left, height: height)
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}
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override var isHighlighted: Bool {
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didSet {
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contentView.backgroundColor = UIColor(white: isHighlighted ? 0.9 : 1, alpha: 1)
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}
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}
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}
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extension LabelCell: IGListBindable {
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func bindViewModel(_ viewModel: Any) {
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guard let viewModel = viewModel as? String else { return }
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label.text = viewModel
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}
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}
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