mirror of
https://github.com/MessageKit/MessageKit.git
synced 2026-02-06 19:03:19 +00:00
zhongwuzw
71 lines
3.8 KiB
Swift
71 lines
3.8 KiB
Swift
/*
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MIT License
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Copyright (c) 2017 MessageKit
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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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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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 THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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import Foundation
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/// Optional Cell Protocol to Simplify registration/cell type loading in a generic way
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public protocol CollectionViewReusable: AnyObject {
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static func reuseIdentifier() -> String
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}
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public extension MessagesCollectionView {
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/// Registers a particular cell using its reuse-identifier
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func register<CellType: UICollectionViewCell & CollectionViewReusable>(_ cellClass: CellType.Type) {
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register(cellClass, forCellWithReuseIdentifier: CellType.reuseIdentifier())
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}
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/// Registers a reusable view for a specific SectionKind
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func register<ViewType: UICollectionReusableView & CollectionViewReusable>(_ headerFooterClass: ViewType.Type, forSupplementaryViewOfKind kind: String) {
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register(headerFooterClass,
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forSupplementaryViewOfKind: kind,
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withReuseIdentifier: ViewType.reuseIdentifier())
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}
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/// Generically dequeues a cell of the correct type allowing you to avoid scattering your code with guard-let-else-fatal
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func dequeueReusableCell<CellType: UICollectionViewCell & CollectionViewReusable>(_ cellClass: CellType.Type, for indexPath: IndexPath) -> CellType {
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guard let cell = dequeueReusableCell(withReuseIdentifier: cellClass.reuseIdentifier(), for: indexPath) as? CellType else {
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fatalError("Unable to dequeue \(String(describing: cellClass)) with reuseId of \(cellClass.reuseIdentifier())")
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}
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return cell
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}
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/// Generically dequeues a header of the correct type allowing you to avoid scattering your code with guard-let-else-fatal
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func dequeueReusableHeaderView<ViewType: UICollectionReusableView & CollectionViewReusable>(_ viewClass: ViewType.Type, for indexPath: IndexPath) -> ViewType {
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let view = dequeueReusableSupplementaryView(ofKind: UICollectionElementKindSectionHeader, withReuseIdentifier: viewClass.reuseIdentifier(), for: indexPath)
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guard let viewType = view as? ViewType else {
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fatalError("Unable to dequeue \(String(describing: viewClass)) with reuseId of \(viewClass.reuseIdentifier())")
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}
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return viewType
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}
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/// Generically dequeues a footer of the correct type allowing you to avoid scattering your code with guard-let-else-fatal
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func dequeueReusableFooterView<ViewType: UICollectionReusableView & CollectionViewReusable>(_ viewClass: ViewType.Type, for indexPath: IndexPath) -> ViewType {
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let view = dequeueReusableSupplementaryView(ofKind: UICollectionElementKindSectionFooter, withReuseIdentifier: viewClass.reuseIdentifier(), for: indexPath)
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guard let viewType = view as? ViewType else {
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fatalError("Unable to dequeue \(String(describing: viewClass)) with reuseId of \(viewClass.reuseIdentifier())")
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}
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return viewType
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}
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}
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