-
Notifications
You must be signed in to change notification settings - Fork 1.1k
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
- Loading branch information
Showing
2 changed files
with
87 additions
and
0 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,81 @@ | ||
| import SwiftUI | ||
| import DesignSystem | ||
|
|
||
| /// Asynchronous Image View that replicates the public API of `SwiftUI.AsyncImage`. | ||
| /// It uses `ImageDownloader` to fetch and cache the images. | ||
| struct CachedAsyncImage<Content>: View where Content: View { | ||
| @State private var phase: AsyncImagePhase | ||
| private let url: URL? | ||
| private let content: (AsyncImagePhase) -> Content | ||
| private let imageDownloader: ImageDownloader | ||
|
|
||
| public var body: some View { | ||
| content(phase) | ||
| .task(id: url, fetchImage) | ||
| } | ||
|
|
||
| // MARK: - Initializers | ||
|
|
||
| /// Initializes an image without any customization. | ||
| /// Provides a plain color as placeholder | ||
| init(url: URL?) where Content == _ConditionalContent<Image, Color> { | ||
| self.init(url: url) { phase in | ||
| if let image = phase.image { | ||
| image | ||
| } else { | ||
| Color.DS.Background.secondary | ||
| } | ||
| } | ||
| } | ||
|
|
||
| /// Allows content customization and providing a placeholder that will be shown | ||
| /// until the image download is finalized. | ||
| init<I, P>(url: URL?, @ViewBuilder content: @escaping (Image) -> I, @ViewBuilder placeholder: @escaping () -> P) where Content == _ConditionalContent<I, P>, I: View, P: View { | ||
| self.init(url: url) { phase in | ||
| if let image = phase.image { | ||
| content(image) | ||
| } else { | ||
| placeholder() | ||
| } | ||
| } | ||
| } | ||
|
|
||
| init( | ||
| url: URL?, | ||
| imageDownloader: ImageDownloader = .shared, | ||
| @ViewBuilder content: @escaping (AsyncImagePhase) -> Content | ||
| ) { | ||
| self.url = url | ||
| self.imageDownloader = imageDownloader | ||
| self.content = content | ||
|
|
||
| self._phase = State(wrappedValue: .empty) | ||
| if let url, let image = cachedImage(from: url) { | ||
| self._phase = State(wrappedValue: .success(image)) | ||
| } | ||
| } | ||
|
|
||
| // MARK: - Helpers | ||
|
|
||
| @Sendable | ||
| private func fetchImage() async { | ||
| do { | ||
| if let url { | ||
| let image = try await Image(uiImage: imageDownloader.image(from: url)) | ||
| phase = .success(image) | ||
| } else { | ||
| phase = .empty | ||
| } | ||
| } catch { | ||
| phase = .failure(error) | ||
| } | ||
| } | ||
|
|
||
| private func cachedImage(from url: URL?) -> Image? { | ||
| guard let url, let uiImage = imageDownloader.cachedImage(for: url) else { | ||
| return nil | ||
| } | ||
|
|
||
| return Image(uiImage: uiImage) | ||
| } | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters