Implement share/activity button on iOS

Multiplatform/Shared/Article/ArticleToolbarModifier.swift

@@ -11,6 +11,7 @@ import SwiftUI
 struct ArticleToolbarModifier: ViewModifier {
 	
 	@EnvironmentObject private var sceneModel: SceneModel
+	@State private var showActivityView = false
 	
 	func body(content: Content) -> some View {
 		content
@@ -98,11 +99,17 @@ struct ArticleToolbarModifier: ViewModifier {
 				
 				ToolbarItem(placement: .bottomBar) {
 					Button {
+						showActivityView.toggle()
 					} label: {
 						AppAssets.shareImage.font(.title3)
 					}
 					.disabled(sceneModel.shareButtonState == nil)
 					.help("Share")
+					.sheet(isPresented: $showActivityView) {
+						if let article = sceneModel.selectedArticles.first, let link = article.preferredLink, let url = URL(string: link) {
+							ActivityViewController(title: article.title, url: url)
+						}
+					}
 				}
 
 				#endif

Multiplatform/Shared/SceneModel.swift

@@ -24,6 +24,10 @@ final class SceneModel: ObservableObject {
 	@Published var openInBrowserButtonState: Bool?
 	@Published var shareButtonState: Bool?
 
+	var selectedArticles: [Article] {
+		timelineModel.selectedArticles
+	}
+	
 	private var refreshProgressModel: RefreshProgressModel? = nil
 	private var articleIconSchemeHandler: ArticleIconSchemeHandler? = nil
 	

Multiplatform/iOS/Article/ActivityViewController.swift

@@ -0,0 +1,33 @@
+//
+//  ArticleShareView.swift
+//  Multiplatform iOS
+//
+//  Created by Maurice Parker on 7/13/20.
+//  Copyright © 2020 Ranchero Software. All rights reserved.
+//
+
+import UIKit
+import SwiftUI
+import Articles
+
+extension UIActivityViewController {
+	convenience init(url: URL, title: String?, applicationActivities: [UIActivity]?) {
+		let itemSource = ArticleActivityItemSource(url: url, subject: title)
+		let titleSource = TitleActivityItemSource(title: title)
+		self.init(activityItems: [titleSource, itemSource], applicationActivities: applicationActivities)
+	}
+}
+
+struct ActivityViewController: UIViewControllerRepresentable {
+
+	var title: String?
+	var url: URL
+
+	func makeUIViewController(context: Context) -> UIActivityViewController {
+		return UIActivityViewController(url: url, title: title, applicationActivities: [FindInArticleActivity(), OpenInSafariActivity()])
+	}
+
+	func updateUIViewController(_ controller: UIActivityViewController, context: Context) {
+	}
+
+}

Multiplatform/iOS/Article/ArticleActivityItemSource.swift

@@ -0,0 +1,33 @@
+//
+//  ArticleActivityItemSource.swift
+//  Multiplatform iOS
+//
+//  Created by Maurice Parker on 7/13/20.
+//  Copyright © 2020 Ranchero Software. All rights reserved.
+//
+
+import UIKit
+
+class ArticleActivityItemSource: NSObject, UIActivityItemSource {
+	
+	private let url: URL
+	private let subject: String?
+	
+	init(url: URL, subject: String?) {
+		self.url = url
+		self.subject = subject
+	}
+	
+	func activityViewControllerPlaceholderItem(_ : UIActivityViewController) -> Any {
+		return url
+	}
+	
+	func activityViewController(_ activityViewController: UIActivityViewController, itemForActivityType activityType: UIActivity.ActivityType?) -> Any? {
+		return url
+	}
+	
+	func activityViewController(_ activityViewController: UIActivityViewController, subjectForActivityType activityType: UIActivity.ActivityType?) -> String {
+		return subject ?? ""
+	}
+	
+}

Multiplatform/iOS/Article/ArticleViewController.swift

@@ -156,3 +156,8 @@ private extension ArticleViewController {
 	}
 	
 }
+
+public extension Notification.Name {
+	static let FindInArticle = Notification.Name("FindInArticle")
+	static let EndFindInArticle = Notification.Name("EndFindInArticle")
+}

Multiplatform/iOS/Article/FindInArticleActivity.swift

@@ -0,0 +1,40 @@
+//
+//  FindInArticleActivity.swift
+//  NetNewsWire-iOS
+//
+//  Created by Brian Sanders on 5/7/20.
+//  Copyright © 2020 Ranchero Software. All rights reserved.
+//
+
+import UIKit
+
+class FindInArticleActivity: UIActivity {
+	override var activityTitle: String? {
+		NSLocalizedString("Find in Article", comment: "Find in Article")
+	}
+	
+	override var activityType: UIActivity.ActivityType? {
+		UIActivity.ActivityType(rawValue: "com.ranchero.NetNewsWire.find")
+	}
+	
+	override var activityImage: UIImage? {
+		UIImage(systemName: "magnifyingglass", withConfiguration: UIImage.SymbolConfiguration(pointSize: 20, weight: .regular))
+	}
+	
+	override class var activityCategory: UIActivity.Category {
+		.action
+	}
+	
+	override func canPerform(withActivityItems activityItems: [Any]) -> Bool {
+		true
+	}
+	
+	override func prepare(withActivityItems activityItems: [Any]) {
+		
+	}
+	
+	override func perform() {
+		NotificationCenter.default.post(Notification(name: .FindInArticle))
+		activityDidFinish(true)
+	}
+}

Multiplatform/iOS/Article/OpenInSafariActivity.swift

@@ -0,0 +1,49 @@
+//
+//  OpenInSafariActivity.swift
+//  Multiplatform iOS
+//
+//  Created by Maurice Parker on 7/13/20.
+//  Copyright © 2020 Ranchero Software. All rights reserved.
+//
+
+import UIKit
+
+class OpenInSafariActivity: UIActivity {
+	
+	private var activityItems: [Any]?
+
+	override var activityTitle: String? {
+		return NSLocalizedString("Open in Safari", comment: "Open in Safari")
+	}
+	
+	override var activityImage: UIImage? {
+		return UIImage(systemName: "safari", withConfiguration: UIImage.SymbolConfiguration(pointSize: 20, weight: .regular))
+	}
+	
+	override var activityType: UIActivity.ActivityType? {
+		return UIActivity.ActivityType(rawValue: "com.rancharo.NetNewsWire-Evergreen.safari")
+	}
+
+	override class var activityCategory: UIActivity.Category {
+		return .action
+	}
+	
+	override func canPerform(withActivityItems activityItems: [Any]) -> Bool {
+		return true
+	}
+	
+	override func prepare(withActivityItems activityItems: [Any]) {
+		self.activityItems = activityItems
+	}
+	
+	override func perform() {
+		guard let url = activityItems?.first(where: { $0 is URL }) as? URL else {
+			activityDidFinish(false)
+			return
+		}
+		
+		UIApplication.shared.open(url, options: [:], completionHandler: nil)
+		activityDidFinish(true)
+	}
+	
+}

Multiplatform/iOS/Article/TitleActivityItemSource.swift

@@ -0,0 +1,40 @@
+//
+//  TitleActivityItemSource.swift
+//  Multiplatform iOS
+//
+//  Created by Maurice Parker on 7/13/20.
+//  Copyright © 2020 Ranchero Software. All rights reserved.
+//
+
+import UIKit
+
+class TitleActivityItemSource: NSObject, UIActivityItemSource {
+
+	private let title: String?
+
+	init(title: String?) {
+		self.title = title
+	}
+
+	func activityViewControllerPlaceholderItem(_ activityViewController: UIActivityViewController) -> Any {
+		return title as Any
+	}
+
+	func activityViewController(_ activityViewController: UIActivityViewController, itemForActivityType activityType: UIActivity.ActivityType?) -> Any? {
+		guard let activityType = activityType,
+			let title = title else {
+				return NSNull()
+		}
+
+		switch activityType.rawValue {
+		case "com.omnigroup.OmniFocus3.iOS.QuickEntry",
+			 "com.culturedcode.ThingsiPhone.ShareExtension",
+			 "com.tapbots.Tweetbot4.shareextension",
+			 "com.buffer.buffer.Buffer":
+			return title
+		default:
+			return NSNull()
+		}
+	}
+	
+}