99 lines
3.3 KiB
Swift
99 lines
3.3 KiB
Swift
//
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// BrowseCollectionViewCell.swift
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// AltStore
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//
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// Created by Riley Testut on 7/15/19.
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// Copyright © 2019 Riley Testut. All rights reserved.
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//
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import UIKit
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import Roxas
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import Nuke
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@objc class BrowseCollectionViewCell: UICollectionViewCell
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{
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var imageURLs: [URL] = [] {
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didSet {
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self.dataSource.items = self.imageURLs as [NSURL]
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}
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}
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private lazy var dataSource = self.makeDataSource()
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@IBOutlet var bannerView: AppBannerView!
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@IBOutlet var subtitleLabel: UILabel!
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@IBOutlet private(set) var screenshotsCollectionView: UICollectionView!
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override func awakeFromNib()
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{
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super.awakeFromNib()
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self.contentView.preservesSuperviewLayoutMargins = true
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// Must be registered programmatically, not in BrowseCollectionViewCell.xib, or else it'll throw an exception 🤷♂️.
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self.screenshotsCollectionView.register(ScreenshotCollectionViewCell.self, forCellWithReuseIdentifier: RSTCellContentGenericCellIdentifier)
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self.screenshotsCollectionView.delegate = self
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self.screenshotsCollectionView.dataSource = self.dataSource
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self.screenshotsCollectionView.prefetchDataSource = self.dataSource
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}
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}
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private extension BrowseCollectionViewCell
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{
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func makeDataSource() -> RSTArrayCollectionViewPrefetchingDataSource<NSURL, UIImage>
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{
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let dataSource = RSTArrayCollectionViewPrefetchingDataSource<NSURL, UIImage>(items: [])
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dataSource.cellConfigurationHandler = { (cell, screenshot, indexPath) in
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let cell = cell as! ScreenshotCollectionViewCell
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cell.imageView.image = nil
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cell.imageView.isIndicatingActivity = true
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}
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dataSource.prefetchHandler = { (imageURL, indexPath, completionHandler) in
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return RSTAsyncBlockOperation() { (operation) in
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ImagePipeline.shared.loadImage(with: imageURL as URL, progress: nil, completion: { (response, error) in
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guard !operation.isCancelled else { return operation.finish() }
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if let image = response?.image
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{
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completionHandler(image, nil)
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}
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else
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{
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completionHandler(nil, error)
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}
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})
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}
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}
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dataSource.prefetchCompletionHandler = { (cell, image, indexPath, error) in
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let cell = cell as! ScreenshotCollectionViewCell
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cell.imageView.isIndicatingActivity = false
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cell.imageView.image = image
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if let error = error
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{
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print("Error loading image:", error)
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}
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}
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return dataSource
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}
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}
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extension BrowseCollectionViewCell: UICollectionViewDelegateFlowLayout
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{
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func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize
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{
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// Assuming 9.0 / 16.0 ratio for now.
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let aspectRatio: CGFloat = 9.0 / 16.0
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let itemHeight = collectionView.bounds.height
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let itemWidth = itemHeight * aspectRatio
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let size = CGSize(width: itemWidth.rounded(.down), height: itemHeight.rounded(.down))
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return size
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}
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}
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