forked from zelo72/mastodon-ios
87 lines
2.5 KiB
Swift
87 lines
2.5 KiB
Swift
//
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// MediaPreviewImageViewModel.swift
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// Mastodon
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//
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// Created by MainasuK Cirno on 2021-4-28.
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//
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import os.log
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import UIKit
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import Combine
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import Alamofire
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import AlamofireImage
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import FLAnimatedImage
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class MediaPreviewImageViewModel {
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var disposeBag = Set<AnyCancellable>()
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// input
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let item: ImagePreviewItem
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// output
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let image: CurrentValueSubject<(UIImage?, FLAnimatedImage?), Never>
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let altText: String?
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init(meta: RemoteImagePreviewMeta) {
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self.item = .status(meta)
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self.image = CurrentValueSubject((meta.thumbnail, nil))
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self.altText = meta.altText
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let url = meta.url
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AF.request(url).publishData()
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.map { response in
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switch response.result {
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case .success(let data):
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os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: download image %s success", ((#file as NSString).lastPathComponent), #line, #function, url.debugDescription)
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let image = UIImage(data: data, scale: UIScreen.main.scale)
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let animatedImage = FLAnimatedImage(animatedGIFData: data)
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return (image, animatedImage)
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case .failure(let error):
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os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: download image %s fail: %s", ((#file as NSString).lastPathComponent), #line, #function, url.debugDescription, error.localizedDescription)
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return (nil, nil)
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}
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}
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.assign(to: \.value, on: image)
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.store(in: &disposeBag)
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}
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init(meta: LocalImagePreviewMeta) {
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self.item = .local(meta)
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self.image = CurrentValueSubject((meta.image, nil))
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self.altText = nil
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}
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}
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extension MediaPreviewImageViewModel {
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enum ImagePreviewItem {
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case status(RemoteImagePreviewMeta)
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case local(LocalImagePreviewMeta)
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var activityItems: [Any] {
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var items: [Any] = []
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switch self {
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case .status(let meta):
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items.append(meta.url)
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case .local(let meta):
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items.append(meta.image)
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}
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return items
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}
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}
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struct RemoteImagePreviewMeta {
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let url: URL
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let thumbnail: UIImage?
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let altText: String?
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}
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struct LocalImagePreviewMeta {
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let image: UIImage
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}
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}
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