Kyeongmo Yang gaeng2y
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gaeng2y
/ MyDelegate.swift
Created
March 19, 2025 08:32
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| @MainActor | |
| class MyDelegate: UICollectionViewDelegate { | |
| var thumbnailTasks: [IndexPath: Task<Void, Never>] = [:] | |
| func collectionView(_ view: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt item: IndexPath) { | |
| let ids = getThumbnailIDs(for: item) | |
| thumbnailTasks[item] = Task { | |
| defer { thumbnailTasks[item] = nil } | |
| let thumbnails = await fetchThumbnails(for: ids) | |
| Task.detached(priority: .background) { |
gaeng2y
/ MyDelegate.swift
Created
March 19, 2025 08:31
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| @MainActor | |
| class MyDelegate: UICollectionViewDelegate { | |
| var thumbnailTasks: [IndexPath: Task<Void, Never>] = [:] | |
| func collectionView(_ view: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt item: IndexPath) { | |
| let ids = getThumbnailIDs(for: item) | |
| thumbnailTasks[item] = Task { | |
| defer { thumbnailTasks[item] = nil } | |
| let thumbnails = await fetchThumbnails(for: ids) | |
| Task.detached(priority: .background) { |
gaeng2y
/ MyDelegate.swift
Created
March 19, 2025 08:30
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| @MainActor | |
| class MyDelegate: UICollectionViewDelegate { | |
| var thumbnailTasks: [IndexPath: Task<Void, Never>] = [:] | |
| func collectionView(_ view: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt item: IndexPath) { | |
| let ids = getThumbnailIDs(for: item) | |
| thumbnailTasks[item] = Task { | |
| defer { thumbnailTasks[item] = nil } | |
| let thumbnails = await fetchThumbnails(for: ids) | |
| display(thumbnails, in: cell) |
gaeng2y
/ MyDelegate.swift
Created
March 19, 2025 07:58
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| @MainActor | |
| class MyDelegate: UICollectionViewDelegate { | |
| func collectionView(_ view: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt item: IndexPath) { | |
| let ids = getThumbnailIDs(for: item) | |
| Task { | |
| let thumbnails = await fetchThumbnails(for: ids) | |
| display(thumbnails, in: cell) | |
| } | |
| } | |
| } |
gaeng2y
/ MyDelegate.swift
Created
March 19, 2025 07:57
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| @MainActor | |
| class MyDelegate: UICollectionViewDelegate { | |
| func collectionView(_ view: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt item: IndexPath) { | |
| let ids = getThumbnailIDs(for: item) | |
| // Error: 'await' in a function that does not support concurrency | |
| let thumbnails = await fetchThumbnails(for: ids) | |
| display(thumbnails, in: cell) | |
| } | |
| } |
gaeng2y
/ dateRaceSafetyGroupTask.swift
Created
March 19, 2025 07:25
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| func fetchThumbnails(for ids: [String]) async throws -> [String: UIImage] { | |
| var thumbnails: [String: UIImage] = [:] | |
| try await withThrowingTaskGroup(of: (String, UIImage).self) { group in | |
| for id in ids { | |
| group.async { | |
| return (id, try await fetchOneThumbnail(withID: id)) | |
| } | |
| } | |
| // Obtain results from the child tasks, sequentially, in order of completion. | |
| for try await (id, thumbnail) in group { |
gaeng2y
/ taskError.swift
Created
March 19, 2025 07:21
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| func fetchThumbnails(for ids: [String]) async throws -> [String: UIImage] { | |
| var thumbnails: [String: UIImage] = [:] | |
| try await withThrowingTaskGroup(of: Void.self) { group in | |
| for id in ids { | |
| group.async { | |
| // Error: Mutation of captured var 'thumbnails' in concurrently executing code | |
| thumbnails[id] = try await fetchOneThumbnail(withID: id) | |
| } | |
| } | |
| } |
gaeng2y
/ groupTasks.swift
Created
March 19, 2025 07:20
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| func fetchThumbnails(for ids: [String]) async throws -> [String: UIImage] { | |
| var thumbnails: [String: UIImage] = [:] | |
| for id in ids { | |
| thumbnails[id] = try await fetchOneThumbnail(withID: id) | |
| } | |
| return thumbnails | |
| } | |
| func fetchOneThumbnail(withID id: String) async throws -> UIImage { | |
| // ... |
gaeng2y
/ taskCancel.swift
Created
March 19, 2025 07:18
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| func fetchThumbnails(for ids: [String]) async throws -> [String: UIImage] { | |
| var thumbnails: [String: UIImage] = [:] | |
| for id in ids { | |
| try Task.checkCancellation() | |
| thumbnails[id] = try await fetchOneThumbnail(withID: id) | |
| } | |
| return thumbnails | |
| } | |
| func fetchThumbnails(for ids: [String]) async throws -> [String: UIImage] { |
gaeng2y
/ fetchOneThumbnail.swift
Last active
March 19, 2025 06:58
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| func fetchOneThumbnail(withID id: String) async throws -> UIImage { | |
| let imageReq = imageRequest(for: id), metadataReq = metadataRequest(for: id) | |
| let (data, _) = try await URLSession.shared.data(for: imageReq) | |
| let (metaData, _) = try await URLSession.shared.data(for: metadataReq) | |
| guard let size = parseSize(from: metadata), | |
| let image = await UIImage(data: data)?.byPreparingThumbnail(ofSize: size) | |
| else { | |
| throw ThumbnailFailedError() | |
| } | |
| return Image |
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