[ADD] News, Browse and Settings views ported to SwiftUI

This commit contains WIP SwiftUI versions of most of the views in SideStore.

AltStore/View Components/AppIconView.swift

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+//
+//  SwiftUIView.swift
+//  SideStore
+//
+//  Created by Fabian Thies on 18.11.22.
+//  Copyright © 2022 Fabian Thies. All rights reserved.
+//
+
+import SwiftUI
+
+struct AppIconView: View {
+    let iconUrl: URL?
+    var size: CGFloat = 64
+    var cornerRadius: CGFloat {
+        size * 0.234
+    }
+    
+    var body: some View {
+        if let iconUrl, #available(iOS 15.0, *) {
+            AsyncImage(url: iconUrl) { image in
+                image
+                    .resizable()
+            } placeholder: {
+                Color(UIColor.secondarySystemBackground)
+            }
+            .frame(width: size, height: size)
+            .clipShape(RoundedRectangle(cornerRadius: cornerRadius, style: .continuous))
+        } else {
+            RoundedRectangle(cornerRadius: cornerRadius, style: .continuous)
+                .background(Color.secondary)
+                .frame(width: size, height: size)
+        }
+    }
+}
+

AltStore/View Components/AppPillButton.swift

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+//
+//  AppPillButton.swift
+//  SideStore
+//
+//  Created by Fabian Thies on 20.11.22.
+//  Copyright © 2022 Fabian Thies. All rights reserved.
+//
+
+import SwiftUI
+import AltStoreCore
+
+struct AppPillButton: View {
+    
+    @ObservedObject
+    var appManager = AppManager.shared.publisher
+    
+    let app: AppProtocol
+    var showRemainingDays = false
+    
+    var storeApp: StoreApp? {
+        (app as? StoreApp) ?? (app as? InstalledApp)?.storeApp
+    }
+    
+    var installedApp: InstalledApp? {
+        (app as? InstalledApp) ?? (app as? StoreApp)?.installedApp
+    }
+    
+    var progress: Progress? {
+        appManager.refreshProgress[app.bundleIdentifier] ?? appManager.installationProgress[app.bundleIdentifier]
+    }
+//    let progress = {
+//        let progress = Progress(totalUnitCount: 100)
+//        progress.completedUnitCount = 20
+//        return progress
+//    }()
+    
+    var buttonText: String {
+//        guard progress == nil else {
+//            return ""
+//        }
+        
+        if let installedApp {
+            if self.showRemainingDays {
+                return DateFormatterHelper.string(forExpirationDate: installedApp.expirationDate)
+            }
+            
+            return "Open"
+        }
+        
+        return "Free"
+    }
+    
+    var body: some View {
+        SwiftUI.Button(action: handleButton, label: {
+            Text(buttonText.uppercased())
+                .bold()
+        })
+        .buttonStyle(PillButtonStyle(tintColor: storeApp?.tintColor ?? .black, progress: progress))
+    }
+    
+    func handleButton() {
+        if let installedApp {
+            self.openApp(installedApp)
+        } else if let storeApp {
+            self.installApp(storeApp)
+        }
+    }
+    
+    func openApp(_ installedApp: InstalledApp) {
+        UIApplication.shared.open(installedApp.openAppURL)
+    }
+    
+    func installApp(_ storeApp: StoreApp) {
+        let previousProgress = AppManager.shared.installationProgress(for: storeApp)
+        guard previousProgress == nil else {
+            previousProgress?.cancel()
+            return
+        }
+        
+        let _ = AppManager.shared.install(storeApp, presentingViewController: UIApplication.shared.keyWindow?.rootViewController) { result in
+            
+            switch result {
+            case let .success(installedApp):
+                print("Installed app: \(installedApp.bundleIdentifier)")
+                
+            case let .failure(error):
+                print("Failed to install app: \(error.localizedDescription)")
+                NotificationManager.shared.reportError(error: error)
+                AppManager.shared.installationProgress(for: storeApp)?.cancel()
+            }
+        }
+    }
+}
+
+//struct AppPillButton_Previews: PreviewProvider {
+//    static var previews: some View {
+//        AppPillButton()
+//    }
+//}

AltStore/View Components/AppRowView.swift

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+//
+//  AppRowView.swift
+//  SideStore
+//
+//  Created by Fabian Thies on 18.11.22.
+//  Copyright © 2022 Fabian Thies. All rights reserved.
+//
+
+import SwiftUI
+import AltStoreCore
+
+struct AppRowView: View {
+    let app: AppProtocol
+    
+    var storeApp: StoreApp? {
+        (app as? StoreApp) ?? (app as? InstalledApp)?.storeApp
+    }
+    
+    var body: some View {
+        HStack(alignment: .center, spacing: 12) {
+            AppIconView(iconUrl: storeApp?.iconURL)
+            
+            VStack(alignment: .leading, spacing: 2) {
+                Text(app.name)
+                    .bold()
+                
+                Text(storeApp?.developerName ?? "Sideloaded")
+                    .font(.callout)
+                    .foregroundColor(.secondary)
+                
+                RatingStars(rating: 4)
+                    .frame(height: 12)
+                    .foregroundColor(.secondary)
+            }
+            .lineLimit(1)
+            
+            Spacer()
+            
+            AppPillButton(app: app)
+        }
+        .padding()
+        .background(Color(storeApp?.tintColor ?? UIColor.black).opacity(0.5))
+        .clipShape(RoundedRectangle(cornerRadius: 30, style: .circular))
+    }
+}
+
+//struct AppRowView_Previews: PreviewProvider {
+//    static var previews: some View {
+//        AppRowView()
+//    }
+//}

AltStore/View Components/ObservableScrollView.swift

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+//
+//  ObservableScrollView.swift
+//  SideStore
+//
+//  Created by Fabian Thies on 20.11.22.
+//  Copyright © 2022 Fabian Thies. All rights reserved.
+//
+
+import SwiftUI
+
+struct ObservableScrollView<Content: View>: View {
+    @Namespace var scrollViewNamespace
+    
+    @Binding var scrollOffset: CGFloat
+    
+    let content: (ScrollViewProxy) -> Content
+    
+    init(scrollOffset: Binding<CGFloat>, @ViewBuilder content: @escaping (ScrollViewProxy) -> Content) {
+        self._scrollOffset = scrollOffset
+        self.content = content
+    }
+    
+    var body: some View {
+        ScrollView {
+            ScrollViewReader { proxy in
+                content(proxy)
+                    .background(GeometryReader { geoReader in
+                        let offset = -geoReader.frame(in: .named(scrollViewNamespace)).minY
+                        Color.clear
+                            .preference(key: ScrollViewOffsetPreferenceKey.self, value: offset)
+                    })
+            }
+        }
+        .coordinateSpace(name: scrollViewNamespace)
+        .onPreferenceChange(ScrollViewOffsetPreferenceKey.self) { value in
+            scrollOffset = value
+        }
+    }
+}
+
+struct ScrollViewOffsetPreferenceKey: PreferenceKey {
+    static var defaultValue = CGFloat.zero
+    
+    static func reduce(value: inout CGFloat, nextValue: () -> CGFloat) {
+        value += nextValue()
+    }
+}

AltStore/View Components/RatingStars.swift

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+//
+//  RatingStars.swift
+//  SideStore
+//
+//  Created by Fabian Thies on 18.11.22.
+//  Copyright © 2022 Fabian Thies. All rights reserved.
+//
+
+import SwiftUI
+
+struct RatingStars: View {
+    
+    let rating: Int
+    
+    var body: some View {
+        HStack(spacing: 0) {
+            ForEach(0..<5) { i in
+                Image(systemName: i < rating ? "star.fill" : "star")
+                    .resizable()
+                    .aspectRatio(contentMode: .fit)
+            }
+        }
+    }
+}
+
+struct RatingStars_Previews: PreviewProvider {
+    static var previews: some View {
+        RatingStars(rating: 4)
+    }
+}