Mastering share sheet preview

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10. UIActivityViewController
11. let activityVC = UIActivityViewController( activityItems: [shareItem], applicationActivities: nil) self.present(activityVC, animated: true, completion: nil)
12. activityItems: [URL(Web)] activityItems: [URL(file path)] activityItems: [Text] ࣗಈతʹద੾ͳදࣔΛͯ͘͠ΕΔ৔߹
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13. activityItems: [URL, Text] activityItems: [UIImage] activityItems: [NSData] activityItems: [Text, UIImage] վળͷ༨஍͕͋Δ৔߹
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17. let activityVC = UIActivityViewController( activityItems: [...], applicationActivities: nil) self.present(activityVC, animated: true, completion: nil)
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22. -1-JOL.FUBEBUB An object that contains metadata about a URL https://developer.apple.com/documentation/linkpresentation/lplinkmetadata •var originalURL: URL? •var url: URL? •var title: String? •var iconProvider: NSItemProvider? •var imageProvider: NSItemProvider? •var videoProvider: NSItemProvider? •var remoteVideoURL: URL?
23. class ShareActivityItemSource: NSObject, UIActivityItemSource { func activityViewControllerLinkMetadata(_ activityViewController: UIActivityViewController) -> LPLinkMetadata? { linkMetadata } func activityViewControllerPlaceholderItem(_ activityViewController: UIActivityViewController) -> Any { placeholder } func activityViewController(_ activityViewController: UIActivityViewController, itemForActivityType activityType: UIActivity.ActivityType?) -> Any? { item } }
24. class ShareActivityItemSource: NSObject, UIActivityItemSource { func activityViewControllerLinkMetadata(_ activityViewController: UIActivityViewController) -> LPLinkMetadata? { let linkMetadata = LPLinkMetadata() linkMetadata.title = "custom title" linkMetadata.iconProvider = NSItemProvider(contentsOf: imageURL) return linkMetadata } linkMetadata.iconProvider (or imageProvider) linkMetadata.title
25. class ShareActivityLazyLoadItemSource: NSObject, UIActivityItemSource { init(_ url: URL) { self.originalURL = url self.imageURL = saveImageInTemporaryDir(#imageLiteral(resourceName: "ezura"), fileName: "shareImage")! super.init() linkMetadata.title = "placeholder title" linkMetadata.originalURL = originalURL linkMetadata.iconProvider = NSItemProvider(contentsOf: imageURL) linkMetadata.imageProvider = NSItemProvider(contentsOf: imageURL) metadataProvider.startFetchingMetadata(for: originalURL) { [linkMetadata] metadata, error in linkMetadata.title = metadata?.title linkMetadata.url = metadata?.url linkMetadata.originalURL = metadata?.originalURL linkMetadata.iconProvider = metadata?.iconProvider linkMetadata.imageProvider = metadata?.imageProvider } } func activityViewControllerLinkMetadata(_ activityViewController: UIActivityViewController) -> LPLinkMetadata? { return linkMetadata }
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