https://github.com/0xleif/forkedarraypicturesexample

Example of calling an async function for every element in the array, in parallel. Examples include TaskGroup and ForkedArray from Fork.
https://github.com/0xleif/forkedarraypicturesexample

async-await swift

Last synced: 8 days ago
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Example of calling an async function for every element in the array, in parallel. Examples include TaskGroup and ForkedArray from Fork.

• Host: GitHub
• URL: https://github.com/0xleif/forkedarraypicturesexample
• Owner: 0xLeif
• Created: 2022-08-27T19:22:30.000Z (over 2 years ago)
• Default Branch: main
• Last Pushed: 2022-08-27T19:24:27.000Z (over 2 years ago)
• Last Synced: 2024-10-31T04:11:57.530Z (about 2 months ago)
• Topics: async-await, swift
• Language: Swift
• Homepage: https://github.com/0xLeif/Fork
• Size: 6.84 KB
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Fork ForkedArray Pictures Example

```swift

import Fork

import SwiftUI

class PicsumImageStore: ObservableObject {

    @Published var images: [UIImage] = []

    

    // TaskGroup

    func fetch(urls: [URL]) async throws {

        await withThrowingTaskGroup(of: Void.self) { taskGroup in

            for url in urls {

                taskGroup.addTask {

                    try await self.fetch(url: url)

                }

            }

        }

    }

    

    // ForkedArray

    func forkFetch(urls: [URL]) async throws {

        try await urls.asyncForEach(fetch(url:))

    }

    

    private func fetch(url: URL) async throws {

        let (data, _) = try await URLSession.shared.data(from: url)

        

        guard let image = UIImage(data: data) else { return }

        

        DispatchQueue.main.async {

            self.images.append(image)

        }

    }

}

struct ContentView: View {

    private let imageURLs: [URL] = (1 ... 100).compactMap { URL(string: "https://picsum.photos/id/\($0)/200/300") }

    

    @StateObject var imageStore = PicsumImageStore()

    

    var body: some View {

        if imageStore.images.isEmpty {

            Button("Fetch Images") {

                Task {

                    /*

                     // Using Swift TaskGroup

                     try! await imageStore.fetch(urls: imageURLs)

                     */

                     

                     // Using ForkedArray

                     try! await imageStore.forkFetch(urls: imageURLs)

                }

            }

        } else {

            List(imageStore.images, id: \.self) { image in

                Image(uiImage: image)

            }

        }

    }

}

```